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Spicer Drive Axles Application Guidelines

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Page 1

DAAG 0080 June 2025

Application Guidelines

Spicer® Drive Axles Application Guidelines

As a world leader in drivetrain technology, Dana is focused on keeping your business optimized and running strong. From breakthrough, patented technologies to industry-leading innovations, our commercial vehicle products increase durability, reliability, and efficiency.

Page 2

Table of Contents

Introduction
Important Information About These Guidelines 1
Purpose 1
Use of Guidelines 1
Application Engineering Department 1
Drive Warranties 1
Questions 1
Changes to Guidelines 1
Guidelines
Drive Axle Application Guidelines2
City Delivery
Vocational Description .4
Typical Vehicle Types .4
Service Definitions .4
Housing Structural Ratings .4
Construction/Agriculture
Vocational Description .7
Typical Vehicle Types .7
Service Definitions .7
Housing Structural Ratings .7
Fire Service
Vocational Description 10
Typical Vehicle Types 10
Service Definitions 10
Housing Structural Ratings 10
Heavy Haul
Vocational Description 13
Typical Vehicle Types 13
Service Definitions 13
Housing Structural Ratings 13
Intercity Coach
Vocational Description 15
Typical Vehicle Types 15
Vehicle Configuration 15
Service Definitions 15
Housing Structural Ratings 15
Linehaul
Vocational Description 17
Typical Vehicle Types 17
Service Definitions 17
Housing Structural Ratings 17
Logging
Vocational Description 20
Typical Vehicle Types 20
Service Definitions 20
Housing Structural Ratings 20
Mining
Vocational Description 22
Typical Vehicle Types 22
Service Definitions 22
Housing Structural Ratings 22
Motorhome
Vocational Description 24
Typical Vehicle Types 24
Vehicle Configurations 24
Service Definitions 24
Housing Structural Ratings 24

Oil Field

Vocational Description
Typical Vehicle Types 26
Service Definitions 26
Housing Structural Ratings 26
Refuse
Vocational Description 28
Typical Vehicle Types 28
Service Definitions 28
Housing Structural Ratings 28
Rescue
Vocational Description 31
Typical Vehicle Types 31
Vehicle Configuration 31
Service Definitions 31
Housing Structural Ratings 31
Page 3

Table of Contents

School Bus
Vocational Description 33
Typical Vehicle Types 33
Vehicle Configuration 33
Service Definitions 33
Housing Structural Ratings 33
Yard Tractor
Vocational Description .35
Typical Vehicle Types .35
Vehicle Configuration .35
Service Definitions .35
Housing Structural Ratings .35
Housing Structural Ratings
13,500 lbs. Housing Structural Ratin gs37
15,500 lbs. Housing Structural Ratin gs38
17,000 lbs. Housing Structural Rating gs39
19,000 lbs. Housing Structural Ratin gs40
20,000 lbs. Housing Structural Ratin gs41
21,000 lbs. Housing Structural Rating gs42
22,000 lbs. Housing Structural Ratin gs44
23,000 lbs. Housing Structural Ratin gs45
25,000 lbs. Housing Structural Ratin gs 47
26,000 lbs. Housing Structural Ratin gs48
30,000 lbs. Housing Structural Ratin gs49
35,000 lbs. Housing Structural Ratin gs50
40,000 lbs. Housing Structural Ratin gs51
44,000 lbs. Housing Structural Ratin gs54
46,000 lbs. Housing Structural Ratin gs55
50,000 lbs. Housing Structural Ratin gs57
52,000 lbs. Housing Structural Ratin gs58
60.000 lbs. Housing Structural Ratin as59

Tridem Load Ratings

Tridem Load Ratings
Drive Axle Identification
Spicer® Drive Axle Model Identification .62
Drive Axle Head Assembly .64
Parts Identification .65
Nomenclature
66
67
68
69
70
71
72
Power Divider Operation
Power Flow and d Torque Distribution 73
Wheel Differential Lock
Differential Lock Engaged 76
Differential Lock Disengaged 76
Lubrication
Approved Lubricants 77
Recommendations for Viscosity/Ambient Temperature 77
Lube Change Intervals 78
Severe Service Lubrication Change Intervals 78
Dual Range Tandem Axle Drives
Description and Operation .79
Gearing and Torque Distribution - Dual Range Gearing .79
Planetary Double Reduction Axles
Description and Operation8
Track, SLR, SMC
Dual/Single Tire 81

Super Single Tires / Offset Wheels

Offset Wheels
Ratings Charts
40,000 lb. Ratings 83
44,000 lb. Ratings 85
46,000 lb. Ratings 86
Glossary
~
arms Q7
01
Page 4

Important Information About These Guidelines

Purpose

The purpose of these Drive Application Guidelines is to provide original equipment manufacturer (OEM) builders of medium and heavy-duty trucks with information about which Spicer® drive axle products are approved by Dana Holding Corporation's Commercial Vehicle Products (Dana CVP) for use in common vocational applications in the USA and Canada.

Use of Guidelines

These Guidelines apply to on-, on-off, and off-highway axle applications and vocations in the USA and Canada. Vehicle applications that meet the specified vocation definitions and specified axle criteria are approved by Dana CVP for use within the applicable General Requirements and Recommendations without formal review by Dana CVP. Applications outside the specified vocations, duty cycles, ratings, and all offroad applications must be reviewed and approved on an individual basis by the Dana CVP

Application Engineering Department

This review requirement also applies to the approval of drive axles with available options.

Drive Warranties

Dana CVP's warranties for drive axles are printed in the Spicer® Warranty Guide (SWGR1). Applications and installations must either meet the requirements of these Guidelines or be approved by the Dana CVP Application Engineering Department. Failure to obtain applications approval of the use of Spicer® axles or their components in non-approved applications will void the Dana CVP warranty coverage. Modification of the vehicle or drive axle configuration, changes in the vocational use, or service outside the limits of these Guidelines will void the Dana CVP warranty coverage.

Questions

For answers to questions concerning the Guidelines or to request a Drive Axle Approval Request Form for a use not covered by the Guidelines, contact one of the following:

Dana Sales and Service Office1-877-777-5360 24 hours a day in the USA or Canada

Dana Holding Corporation Commercial Vehicle Products 3939 Technology Drive Maumee, OH 43537 Phone: 1-877-342-3000

Changes to Guidelines

These Guidelines are subject to change at any time, without prior notice, at the discretion of Dana CVP. For the most current revision to these Guidelines, visit the Dana website at www.dana.com.

Effective Date: [June 2025]

Page 5

Drive Axle Application Guidelines
General Notes:

  • 1. Additional ratios may be available and would require individual application approval.
  • 2. Maximum allowable torsional driveline acceleration is 300 rad. sec./sec. within the defined operating speed range of the engine manufacturer. When a manual transmission is used, a soft dampened clutch is recommended.
  • 3. Double reduction models offer added durability and gross weight capability in severe service applications where higher numeric ratios are required.
  • 4. Single vehicle retarders can be approved with all axle models, provided the product selected meets all the application requirements of the specified vocation.
  • 5. The use of dual retarders (engine, exhaust, transmission and/ or electromagnetic) is only approved with tandem drive axle models with gross weight ratings of 46,000 lbs. or higher and the maximum allowable retardation is limited to 100% of the max. rated engine torque. For line haul or heavy haul applications, the maximum allowable retardation can be limited to 110% of the max. rated engine torque.
  • 6. All vehicles with electromagnetic retarders, such as Telma or Eaton's Hydraulic Launch Assist (HLA), require individual application approval by the Dana CVP Application Engineering Department.
  • 7. For optimum axle shaft retention to the hub, .750 in. diameter studs or .625 in. diameter studs with tapered dowels are recommended for single axles with GAWR ratings of 23,000 lbs. and above or tandem and tridem drive axles with GAWR ratings of 46,000 lbs. and above. OEMs are responsible for axle shaft retention on all units not dressed by Dana. See page 73 for illustration.
  • Localized sources of heat, such as engine exhaust, that may cause high axle operating temperatures or reduced seal life are to be avoided. Maximum intermittent drive axle surface temperatures measured at the input seal are not to exceed 300° F for more than 30 minutes. Maximum continuous operating temperatures are not to exceed 250° F.
  • 9. Dana CVP application approval is required for all vehicles with hybrid power systems.

  • 10. The following optional components are approved by this Guideline. All options may not be available on every axle model.
    • a. Driver-Controlled Wheel Differential Lock
    • b. Oil Pump
    • c. Low Maintenance Wheel Ends (LMS®)
  • 11. The use of NoSPIN® differentials in any drive axle will result in the exclusion of axle shafts from warranty consideration. Certain other carrier components may also be excluded from warranty consideration if their failure is deemed to be the result of NoSPIN® use. Depending on the axle loading, the NoSPIN® can cause all the torque to be directed to one axle shaft resulting in overload and potential failure. NoSPIN® is a registered trademark of Eaton Corporation.
  • 12. Drive axle application approval and allowable gross axle weight are based on the vehicle suspension selected. Dana CVP is not responsible for the durability of any attachments to the axle housing(s) unless produced by Dana Holding Corporation. In addition, Dana CVP is responsible for the integrity of the bracket attachment only if the bracket is installed by Dana or if the bracket is installed by the vehicle manufacturer following procedures approved by Dana through prior agreement.
  • For certain suspension models, Dana may require the use of an increased housing wall thickness. Refer to the Housing Structural Rating Section of this Guideline or contact Dana CVP Application Engineering for specific requirements.
  • 14. Drive axles configured with single tires and outset wheels that increase the track over the standard track width with dual tires require special considerations. Allowable gross axle weight ratings may have to be reduced from the nominal rating to compensate for the increase in housing stress created through the usage of single tires with outset wheels. Refer to the Housing Structural Rating Section of this Guideline for additional information regarding gross axle weight ratings based on increased track width due either to the usage of single tires and outset wheels or wide track housings. Outset wheels greater than 2.0 in. are not approved. All drive axles with single tires and outset wheels require a pre-set hub system (such as Dana's LMS® or LMSiTM).
  • 15. Oil pumps and/or Driver-Controlled Wheel Differential Lock(s) are recommended for operations where vehicles operate in areas of poor traction.
Page 6
Guidelines

  • 16. It is the responsibility of the vehicle manufacturer and/ or the dealer to accurately convey all approved axle loading information to the body builder if the chassis is sold incomplete. It is also the responsibility of the final vehicle builder to insure the assigned tagged values for GAWR and GVW/GCW do not exceed those limits approved by this Guideline. Dana is not responsible for non-compliance to this request
  • 17. Suspension capacity shall not exceed nominal drive axle capacity by more than 3,000 lbs. per axle with the exception0 of the S20-045B, DS404, D40-145, D40-155, D40-156 and S20-140 drive axle models. For the above exceptions, only a suspension capacity of 1,000 lbs. per axle over the nominal drive axle capacity is approved.
  • 18. For straight trucks, pusher and tag axles should be used to comply with the Federal Bridge Formula.

  • 19. Vehicle testing of any nature voids the warranty on Dana Spicer® drive axles.
  • 20. For specific warranty coverage, see Spicer® Warranty Guide (SWGR1).
  • 21. For approval of Spicer® drive lines, Bendix brakes or other Spicer components contact Dana at 1-877-777-5360.
Formulas:

In vehicles equipped with driving steerable axles, the wheel speed mismatch between the front and rear axle(s) is a concern. This mismatch is affected by the front and rear axle ratios as well as the tire revolution per mile (TRPM) and tire static loaded radius (SLR). Dana CVP Application Engineering requires this mismatch value not to exceed ±1.5%. The % of mismatch is calculated below:

For high vehicle speed:

% mismatch = (Rear drive axle ratio x rear axle tire TRPM) - (front drive axle ratio x front axle tire TRPM)

Rear drive axle ratio x rear axle tire TRPM

For slow vehicle speed:

% mismatch = (Rear drive axle ratio x front axle tire SLR) - (front drive axle ratio x rear axle tire SLR)

Rear drive axle ratio x front axle tire SLR

Page 7

Vocational Description

  • Pickup and delivery service within cities and/or suburban areas
  • 100% of operation on road surfaces of concrete, asphalt and maintained gravel
  • Three (3) miles between starts/stops (typical)
  • 100% load going / up to 40% load return (typical)
Typical Vehicle Types

  • Armored Truck
  • Ambulance
  • Auto Transport Truck
  • Beverage Truck
  • Flatbed Truck

Livestock Hauler

General Freight Truck

  • Moving Van
  • Municipal Truck
  • Newspaper Delivery
  • Pickup and Delivery
  • Postal Delivery
  • Refrigerated Truck
  • Regional Haul
  • Roll Back Auto Transporter
  • Side Truck
  • Stake Truck
  • Tanker Truck
  • Utility Truck
  • Wrecker
Service Definitions

(vocational description applies to all operations)

Operation 1 - Grades up to 8%

  • Operation 2 Grades up to 12%
  • Operation 3 Grades up to 20%

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 8

Engine Max. Gross Weigh
(GVW / GCW) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque
(lb.ft.) 		Operation 1
8% Grade 		Operation 2
12% Grade 		Operation 3 20% Grade Fastest Slowest
Single Axles
S14-130 13,500 15.7 660 25,000 25,000 N/A 3.73 5.38
S16-130 15,500 18.1 605 35,000 25,000 N/A 3.73 5.38
S17-140 17,000 19.7 860 46,000 40,000 N/A 3.58 5.57
S19-140 19,000 19.7 860 46,000 40,000 N/A 3.58 5.57
19060S 19,000 20.1 860 60,000 50,000 45,000 3.08 5.57
S20-140 20,000 19.7 860 46,000 40,000 N/A 3.58 5.57
S21-140 21,000 19.7 860 46,000 40,000 N/A 3.58 5.57
21060S 21,000 21.1 860 60,000 50,000 45,000 3.08 5.57
S21-172/172E 21,000 21.1 1450 80,000 65,000 55,000 3.07 5.57
S21-190 21,000 22.0 1650 100,000 85,000 70,000 3.07 5.57
S21-190E 21,000 22.0 1650 100,000 85,000 70,000 3.42 5.57
22060S 22,000 21.1 860 60,000 50,000 45,000 3.08 5.57
23060SH 23,000 19.8 860 60,000 50,000 45,000 3.08 5.57
S23-172/172E 23,000 22.0 1450 80,000 65,000 55,000 3.07 5.57
S23-190 23,000 22.0 1650 100,000 85,000 70,000 3.07 5.57
S23-190 23,000 19.8 1850 80,000 70,000 60,000 3.07 4.30
S23-190E 23,000 22.0 1650 100,000 85,000 70,000 3.42 5.57
S25-172/172E 25,000 22.0 1450 80,000 65,000 55,000 3.42 5.57
S26-190/190E 26,000 22.0 1650 100,000 85,000 70,000 3.42 5.57
Page 9

Engine gine (GVW / GCW) Gear _
Axle Model Max.
GAWR
(lb.) 		Max
SLR
(.in) 		Torque
(lb.ft.) 		Operation 1
8% Grade 		Operation 2
12% Grade 		Operation 3 20% Grade Fastest Slowest
Tandem A xles Note
DS404/405 40,000 21.1 1650 90,000 90,000 80,000 3.08 5.57 | 1,2
DSP40/41 40,000 21.1 1650 90,000 90,000 80,000 3.08 5.57 1,2
DSP40/41 40,000 19.8 1650 105,000 N/A N/A 3.90 4.11 1,2
D40-155 40,000 19.8 1850 80,000 80,000 80,000 2.26 2.93 | 1
D40-155 40,000 20.7 1850 80,000 80,000 80,000 3.08 3.91 | 1
DSH40 40,000 19.8 1850 105,500 90,000 80,000 3.36 3.90 3,4
DSH40 40,000 21.1 1850 90,000 90,000 80,000 3.08 4.88 4
D40-172 40,000 21.1 2050 160,000 140,000 120,000 3.07 5.38 ]
D46-172/172H 46,000 22 2050 160,000 140,000 120,000 3.07 5.38 ]

Note

1 Suspension and application restrictions may exist with the DS404, DSP40, and D40-155. Please consult the Housing Structural Ratings Section for minimum housing box section requirements.

2 When multiple torque engines are specified, a maximum engine torque of 1750 Lb-Ft can be approved if the higher engine torque is limited to direct and/or overdrive transmission gears.

3 Operation 1 is limited to 6% Grade.

4 The max engine torque for 3.42 ratio is limited to 1.650 lb.ft

Page 10
Construction/Agriculture

Vocational Description

  • Movement of material to, from, or around a job site
  • 90% of loaded operation on prepared road surfaces of concrete, asphalt, gravel, crushed rock or hard packed dirt and up to 10% of loaded operation into sandy or muddy work areas.
  • Liftable tag and pusher axles are often used to increase legal load capacity on highway.
  • Vehicles typically operate a high percentage of time off-highway making a high number of stops and starts.
  • Straight trucks as well as trucks with equipment trailers are considered construction vehicles. Tractor/semi-trailers and straight trucks pulling material trailers or dump body pups will be considered mining applications and should be reviewed based on guidelines established for that vocation.
Typical Vehicle Types

  • Armored Asphalt Truck
  • Block/Brick Truck
  • Bucket Truck
  • Concrete Pumper
  • Crane/Cherry Picker
  • End/Side Dump TruckFeedlot Truck
  • Flatbed Truck
  • Grain Truck
  • Landscape Truck

  • Milk Tanker Truck
  • Mixer Truck
  • Roll-off Container Truck
  • Silage Truck
  • Stake Body Truck

  • Snowplow/Snowblower
  • Tanker Truck
  • Transit Mixer
  • Utility Truck
Service Definitions

(Vocational description applies to all operations)

Operation 1 - GVW / GCW - straight trucks and straight trucks with equipment trailers. Grades up to 12%.

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 11

Engine Max. Gross Weight (lb.)
(GVW / GCW) 		Gear Ratios
Axle Model Max. GAWR (lb.) Max SLR
(.in) 		Torque (lb.ft.) Operation 1
12% Grade 		Fastest Slowest
Single Axle es
S16-130 15,500 18.1 605 25,000 3.73 5.38
S17-140 17,000 19.7 860 29,000 3.58 5.57
S19-140 19,000 19.7 860 31,000 3.58 5.57
19060S 19,000 20.1 860 31,000 3.55 5.57
S20-140 20,000 19.7 860 31,000 3.58 5.57
S21-140 21,000 19.7 860 31,000 3.58 5.57
21060S 21,000 21.1 860 33,000 3.55 5.57
S21-172/172E 21,000 21.1 1450 50,000 3.07 5.57
S21-190/190E 21,000 21.1 1450 60,000 3.07 5.57
22060S 22,000 21.1 860 34,000 3.55 5.57
23060SH 23,000 19.8 860 34,000 3.55 5.57
S23-172/172E 23,000 21.1 1450 50,000 3.07 5.57
S23-190 23,000 22.0 1450 60,000 3.07 5.57
S23-190E 23,000 22.0 1450 60,000 3.42 5.57
S23-590 23,000 22.0 1450 60,000 4.75 7.30
S25-172/172E 25,000 21.1 1450 50,000 3.07 5.57
S26-190/190E 26,000 22.0 1450 60,000 3.42 5.57
S26-590 26,000 22.0 1450 60,000 4.75 6.65
S30-190/190E 30,000 22.7 1450 60,000 3.42 5.57
S30-590 30,000 22.7 1450 60,000 4.75 6.65
Page 12

Engine (Ib.)
(GVW / GCW) 		Gear Ratios
Axle Model Max.GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
12% Grade 		Fastest Slowest
Tandem Axl es · ·
DS405 40,000 21.1 1450 66,000 3.55 5.57
DSP41 40,000 21.1 1650 68,000 3.55 5.57
DSH40 40,000 21.1 1650 70,000 3.55 5.29
DSH40 40,000 21.1 1850 70,000 3.55 4.33
D40-172 40,000 21.1 2050 100,000 3.42 5.38
DSH44 44,000 21.1 1650 72,000 3.55 5.29
DSH44 40,000 21.1 1850 72,000 3.55 4.33
D46-172/172H 46,000 22.0 2050 100,000 3.42 5.38
D46-590HP 46,000 22.0 2050 110,000 4.75 7.75
D50-172 50,000 22.0 2050 100,000 3.42 5.38
D52-190P 52,000 22.0 2050 110,000 3.42 5.57
D52-590P 52,000 22.0 2050 110,000 4.75 7.75
D60-190P 60,000 22.7 2050 110,000 3.42 4.56
D60-590P 60,000 22.7 2050 110,000 4.75 7.75
Tridem Axle S
T60 170UD 20.0 2050 100 000 2.01 1 70

Note

NOLE

3

3

Note

2

4 79

Note

T78-590F

1 Suspension restrictions may exist with the D46-172. Please consult the Housing Structural Ratings Section for minimum housing box section requirements.

2 Allowable tridem gross axle weight rating (GAWR) varies with axle ratio. Refer to the Tridem Load Ratings Section for information regarding permissible gross axle weight ratings.

3 Operation 1 is limited to 6% Grade.

Note 2

Page 13

Vocational Description

  • Vehicles used to transport people and equipment for the purpose of extinguishing fires or ambulance service
  • 90% of operation on prepared road surfaces of concrete, asphalt, gravel, crushed rock, or hard packed dirt and up to 10% of loaded operation into sandy or muddy areas.
  • Mileage is typically under 15,000 miles per year
  • Typical vehicle routes are three (3) miles between start and stop
  • Vehicle retarders (engine, exhaust, transmission, or electromagnetic) are common
  • High engine horsepower and automatic transmissions are typical.
  • Loaded 100% of the time.

Typical Vehicle Types

  • Aerial Ladders
  • Emergency Vehicle non-pumper
  • Aerial Platforms
  • ......
    • ____
  • First Responder Truck
  • Foam Tender Truck

Pumpers

Tankers

  • Fire Truck
  • Hazardous Material
Service Definitions

Operation 1 - GVW - Straight trucks. Grades up to 20%.

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 14

Engine Max. Gross Weight (Ib.)
(GVW / GCW) 		Gear Ratios
Axle Model Max.GAWR (lb.) Max SLR
(.in) 		Torque (lb.ft.) Operation 1
20% Grade 		Fastest Slowest
Single Axl es Note
S14-130 13,500 15.7 660 26,500 3.73 5.13 7
S16-130 15,500 18.1 605 26,500 3.73 5.13 1
S17-140 17,000 19.7 860 27,000 3.58 5.57 1
S19-140 19,000 19.7 860 31,000 3.58 5.57 1
19060S 19,000 20.1 950 31,000 3.25 5.57 1
S20-140 20,000 19.7 860 31,000 3.58 5.57 1
21060S 22,000 21.1 950 34,000 3.25 5.57 ]
S21-140 22,000 19.7 860 31,000 3.58 5.57 ]
S21-172/172E 22,000 21.1 1450 45,000 3.07 5.57 ]
S21-190 22,000 21.1 1650 45,000 3.07 6.14
S21-190E 22,000 21.1 1650 45,000 3.42 6.14
22060S 22,000 21.1 950 34,000 3.25 5.57
23060SH 23,000 19.8 950 34,000 3.25 5.57
S23-172/172E 23,000 22.0 1450 45,000 3.07 5.57
S23-190 24,000 22.0 1650 46,000 3.07 6.14
S23-190E 24,000 22.0 1650 46,000 3.42 6.14
S25-172/172E 26,000 22.0 1450 48,000 3.07 5.57
S26-190/190E 27,000 22.0 1650 49,000 3.42 6.14
S30-190/190E 31,000 22.7 1650 53,000 3.42 6.14
S30-590 31,000 22.7 1650 53,000 4.75 6.65
S35-590FT 35,000 22.7 1650 58,000 4.75 6.65 2
Note

1 Suspension restrictions may exist with the DS404, DSP40, and D46-172. Please consult the Housing Structural Ratings Section for minimum housing box section requirements

2 Dana's Commercial Vehicle Division offers this single drive axle for the Fire Service market.

Page 15

Engine Max. Gross Weight
(lb.) (GVW / GCW) 		Gear Ratios _
Axle Model Max.GAWR (lb.) Max SLR
(.in) 		Torque
(lb.ft.) 		Operation 1
20% Grade 		Fastest Slowest
Tandem A xles Not
DS404 40,000 21.1 1550 62,000 3.25 5.57 ] 1
DS405 42,000 21.1 1550 64,000 3.25 5.57 ]
DSP40 40,000 21.1 1550 62,000 3.25 5.57 | 1
DSP41 42,000 21.1 1550 64,000 3.25 5.57 ]
DSH40 42,000 21.1 1850 64,000 3.25 4.88 ]
D40-172 42,000 21.1 2050 64,000 3.21 5.57 ]
DSH44 45,000 21.1 1850 67,000 3.25 5.29 ]
D46-172 46,000 22.0 2050 68,000 3.21 5.57 ] 1
D46-172H 50,000 22.0 2050 70,000 3.21 5.57
D50-172 52,000 22.0 2050 72,000 3.21 5.57
D52-190P 54,000 22.0 2050 76,000 3.42 5.38
D60-190P 60,000 22.7 2050 82,000 3.42 5.38
200 1001 00,000 2000 32,000 0.12 0.00

Note

1 Suspension restrictions may exist with the DS404, DSP40, and D46-172. Please consult the Housing Structural Ratings Section for minimum housing box section requirements

2 Dana's Commercial Vehicle Division offers this single drive axle for the Fire Service market.

Page 16
Heavy Haul

Vocational Description

  • Movement of heavy equipment or materials at legal maximums or special permit loadings
  • Exclusive operation on prepared road surfaces of concrete, asphalt and maintained gravel
  • High horsepower engines and auxiliary transmissions are typically used
  • Loaded going and empty return
  • Infrequent stops

Typical Vehicle Types

Flatbed

  • Heavy Wrecker
  • Heavy Equipment Transport
  • Lowbov
  • Specialized Heavy Haul
  • Steel Hauling
Service Definitions

(Vocational description applies to all operations)

Operation 1 - Grades up to 8%

Operation 2 - Grades up to 12%

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 17

Engine (GVW) GCW) Gear Ratios
Axle Model odel Max. Max
GAWR SLR
(lb.) (.in) 		Torque
(lb.ft.) 		Operation 1
8% Grade 		Operation 2
12% Grade 		Fastest Slowest
Tandem A xles
D46-172H 46,000 22.0 2050 210,000 190,000 3.42 4.56
D46-590HP 46,000 22.0 2250 240,000 225,000 4.75 7.30
D50-172 50,000 22.0 2050 210,000 190,000 3.42 4.56
D52-190P 52,000 22.0 2250 240,000 225,000 3.58 4.78
D52-590P 52,000 22.0 2250 240,000 225,000 4.75 7.30
D60-190P 60,000 22.7 2250 240,000 225,000 3.58 4.78
D60-590P 60,000 22.7 2250 240,000 225,000 4.75 7.30
Tridem Ax les Note
T69-172HP 20.8 2050 200,000 185,000 3.91 4.78 1
T78-190P Note 1 20.8 2250 240,000 225,000 3.91 4.78 1
T78-590P 20.8 2250 240,000 225,000 4.75 7.30 1

Note

1 Allowable tridem gross axle weight rating (GAWR) varies with axle ratio. Refer to the Tridem Load Ratings Section for information regarding permissible gross axle weight ratings.

Page 18

Vocational Description

  • Transportation of people and, on occasion, light freight between cities or suburban areas
  • Exclusive operation on well maintained paved surfaces
  • High mileage operation
  • Typical vehicle routes exceed 30 miles between start and stop
  • No towed load allowed

Typical Vehicle Types

  • Tour Coach
  • Cross Country Coach

Vehicle Configuration

6 x 2 straight coach with fixed tag or pusher axle

Service Definitions

Operation 1 - Grades up to 8%

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 19

Engine Max. Gross Weight (lb.)
(GVW / GCW) 		Gear Ratios
Axle Model Max.GAWR a (lb.) Max SLR
(.in) 		Torque (lb.ft.) Operation 1
8% Grade 		Fastest Slowest

Single Axles

S21-140 21,000 20.1 860 42,000 3.31 4.88
22060S 22,000 20.7 1050 45,000 3.36 4.78
23060SH 23,000 19.8 1050 45,000 3.36 4.88
S23-172 23,000 21.1 1450 55,000 3.42 4.78
S23-190 23,000 21.1 1650 55,000 3.42 4.78
S25-172 25,000 21.1 1450 55,000 3.42 4.78
S26-190 26,000 21.1 1650 55,000 3.42 4.78
Page 20
Linehaul

Vocational Description

  • Long distance transport of various types of freight in high mileage operation (min 60.000 miles/vear)
  • Exclusive operation on road surfaces of good to excellent concrete or asphalt
  • Vehicle routes are typically on limited access highways and exceed 30 miles between starts and stops
  • Maximum infrequent grades of up to 8%
  • Majority of vehicles are 4 x 2, 6 x 2 (fixed tag or pusher) and 6 x 4 tractor/trailer combinations and some straight trucks

Typical Vehicle Types

  • Auto Hauler
  • Bulk Hauler
  • Double Trailers
  • Flatbed Trailers
  • Grain Haulers

General Freight

  • Hay Haulers
  • Livestock Haulers
  • Lumber Haulers
  • Moving Van
  • Pipe Hauler
  • Refrigerated Freight
  • Refuse/On-Highway Trailer
  • Tanker Trailer
  • Triple Trailers
  • Van Trailer
Service Definitions

(interstate highways, turnpikes and limited access roadways)

Operation 1 - Grades up to 3%

Operation 2 - Infrequent grades up to 8%

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 21

Note

Engine Max. Gross
(GVW ) 		Weight (lb.)
/ GCW) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
3% Grade 		Operation 2
8% Grade 		Fastest Slowest
Single Axles
S21-140 21,000 19.7 860 46,000 46,000 3.58 4.56
21060S 21,000 21.1 860 60,000 60,000 3.08 4.63 ]
S21-172 21,000 21.1 1650 100,000 90,000 3.07 4.56 2
S21-175 21,000 20.1 1850 120,000 90,000 1.95 2.31 ]
S21-175 21,000 21.1 1850 130,000 90,000 2.47 3.42 ]
S21-190 21,000 22.0 1650 140,000 110,000 2.56 4.56 ] 1
S21-190 21,000 20.1 1850 100,000 80,000 2.56 4.30 ]
22060S 22,000 21.1 860 60,000 60,000 3.08 4.63 ]
23060SH 23,000 19.8 860 60,000 60,000 3.08 4.63 ]
S23-172 23,000 21.1 1650 100,000 90,000 3.07 4.56 2
S23-175 23,000 20.1 1850 120,000 90,000 1.95 2.31 ]
S23-175 23,000 21.1 1850 130,000 90,000 2.47 3.42 ]
S23-190 23,000 22.0 1650 140,000 110,000 2.56 4.56 ] 1
S23-190 23,000 20.1 1850 100,000 80,000 2.56 4.30 ]
S25-175 25,000 20.1 1850 120,000 90,000 1.95 2.31 ]
S25-175 25,000 21.1 1850 130,000 90,000 2.47 3.42 ]
Note

1 When engines with multiple torque outputs are specified, a maximum engine torque of 1750 lb-ft can be approved if limited to direct and overdrive transmission gears only.

  • 2 When engines with multiple torque outputs are specified, a maximum engine torque of 1850 lb-ft can be approved if limited to direct and overdrive transmission gears only.
  • 3 Suspension and application restrictions may exist with the DS404, DSP40, and D40-155. Please consult the Housing Structural Ratings Section for minimum housing box section requirements.
  • 4 For 2.05 and 2.16 ratio, Operation 2 is limited to 6% maximum Grade.
  • 5 The max engine torque for 3.42 ratio is limited to 1850 lb.ft.
  • 6 For 2.05 ratio, the max tire SLR is limited to 19.0".
Page 22

Engine Max. Gross
(GVW) 		Weight (lb.)
/ GCW) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
3% Grade 		Operation 2
8% Grade 		Fastest Slowest
Note
40,000 21.1 1650 143,000 110,000 3.08 4.11 3
40,000 21.1 1850 80,000 80,000 3.08 4.11 3
40,000 21.1 1550/1750 80,000 80,000 3.08 3.70 1,3
40,000 21.1 1650 143,000 110,000 3.08 4.33 3
40,000 21.1 1850 80,000 80,000 3.08 4.33 3
40,000 21.1 1550/1750 80,000 80,000 3.08 3.70 1,3
40,000 19.9 1650 145,000 110,000 2.26 2.93 1,3
40,000 19.9 1850 80,000 80,000 2.05 2.93 3,4,6
40,000 21.1 1650 145,000 110,000 3.08 3.91 1,3
40,000 21.1 1850 80,000 80,000 3.08 3.91 3
40,000 21.1 2050 143,000 110,000 3.08 4.88 5
40,000 21.1 2050 185,000 160,000 3.07 4.56
46,000 22.0 2250 185,000 160,000 3.07 4.56
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000 		40,000 21.1 40,000 19.9 40,000 19.9 40,000 21.1 40,000 21.1 1650 40,000 21.1 1850 40,000 21.1 1550/1750 40,000 21.1 1650 40,000 21.1 1850 40,000 21.1 1850 40,000 19.9 1650 40,000 19.9 1850 40,000 21.1 1650 40,000 21.1 1650 40,000 21.1 2050 40,000 21.1 1650 143,000 40,000 21.1 1850 80,000 40,000 21.1 1550/1750 80,000 40,000 21.1 1550/1750 80,000 40,000 21.1 1650 143,000 40,000 21.1 1650 143,000 40,000 21.1 1850 80,000 40,000 21.1 1850/1750 80,000 40,000 19.9 1650 145,000 40,000 19.9 1850 80,000 40,000 21.1 1650 145,000 40,000 21.1 1650 145,000 40,000 21.1 1650 145,000 40,000 21.1 2050 143,000 40,000 21.1 2050 143,000 40,000 21.1 2050 185,000 46,000 22.0 2250 185,000 40,000 21.1 1650 143,000 110,000 40,000 21.1 1850 80,000 80,000 40,000 21.1 1550/1750 80,000 80,000 40,000 21.1 1550/1750 80,000 80,000 40,000 21.1 1650 143,000 110,000 40,000 21.1 1850 80,000 80,000 40,000 21.1 1850/1750 80,000 80,000 40,000 21.1 1550/1750 80,000 80,000 40,000 21.1 1550/1750 80,000 80,000 40,000 19.9 1650 145,000 110,000 40,000 21.1 1650 145,000 110,000 40,000 21.1 1850 80,000 80,000 40,000 21.1 2050 143,000 110,000 40,000 21.1 2050 143,000 100,000 40,000 21.1 2050 185,000 160 40,000 21.1 1650 143,000 110,000 3.08 40,000 21.1 1850 80,000 80,000 3.08 40,000 21.1 1550/1750 80,000 80,000 3.08 40,000 21.1 1550/1750 80,000 80,000 3.08 40,000 21.1 1650 143,000 110,000 3.08 40,000 21.1 1650 80,000 80,000 3.08 40,000 21.1 1850 80,000 80,000 3.08 40,000 21.1 1850/1750 80,000 80,000 3.08 40,000 19.9 1650 145,000 110,000 2.26 40,000 19.9 1850 80,000 80,000 2.05 40,000 21.1 1650 145,000 110,000 3.08 40,000 21.1 1850 80,000 80,000 3.08 40,000 21.1 2050 143,000 110,000 40,000 21.1 1650 143,000 110,000 3.08 4.11 40,000 21.1 1850 80,000 80,000 3.08 4.11 40,000 21.1 1550/1750 80,000 80,000 3.08 4.11 40,000 21.1 1550/1750 80,000 80,000 3.08 4.33 40,000 21.1 1650 143,000 110,000 3.08 4.33 40,000 21.1 1650 80,000 80,000 3.08 4.33 40,000 21.1 1850 80,000 80,000 3.08 4.33 40,000 21.1 1550/1750 80,000 80,000 3.08 3.70 40,000 19.9 1650 145,000 110,000 2.26 2.93 40,000 21.1 1650 145,000 100,000 3.08 3.91 40,000 21.1 1650 145,000 100,000 3.08 3.91 40,000 21.1<
Note

1 When engines with multiple torque outputs are specified, a maximum engine torque of 1750 lb-ft can be approved if limited to direct and overdrive transmission gears only.

2 When engines with multiple torque outputs are specified, a maximum engine torque of 1850 lb-ft can be approved if limited to direct and overdrive transmission gears only.

3 Suspension restrictions may exist with the DS404, DSP40, and D40-155. Please consult the Housing Structural Ratings Section for minimum housing box section requirements.

4 For 2.05 and 2.16 ratio, Operation 2 is limited to 6% maximum Grade.

5 The max engine torque for 3.42 ratio is limited to 1850 lb.ft.

6 For 2.05 ratio, the max tire SLR is limited to 19.0".

Page 23
Logging

Vocational Description

  • Movement of logs, chips and pulp between logging sites mills, or processing plants
  • High horsepower engines and vehicle retarders are typically used in this vocation
  • Vehicle routes are typically 3 to 30 miles between starts and stops
  • Fully loaded going and empty return
  • Majority of vehicles are 6 x 4 tractor/trailer combination or trucks with full trailers unique to this vocation
Typical Vehicle Types

Chip Hauler

  • Log Hauler
  • Pole Truck & Trailer
  • Straight Truck with Trailer
  • Tractors with Pole Trailers
Service Definitions

Operation 1 - Exclusive operation on road surfaces of concrete or asphalt. Grades not exceeding 8%.

Operation 2 - Infrequent grades up to 12%. 90% of loaded operation on prepared road surfaces of concrete, asphalt, gravel, crushed rock, or hard packed dirt with up to 10% of loaded operation into sandy or muddy job sites.

Operation 3 - Infrequent grades up to 20%. 90% of loaded operation on prepared road surfaces of concrete, asphalt, gravel, crushed rock, or hard packed dirt with up to 10% of loaded operation into sandy or muddy job sites.

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 24

Engine Max. Gross Weigł
(GVW / GCW 		nt (lb.)
) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max
SLR (.in) 		Torque
(Ib.ft.) 		Operation 1
8% Grade 		Operation 2
12% Grade 		Operation 3 20% Grade Fastest Slowest
Tandem Axles

Note

Note

T Contraction of the second seco r 1 1
DS405 40,000 21.1 1650 80,000 N/A N/A 3.36 4.88
DSP41 40,000 21.1 1650 90,000 N/A N/A 3.36 4.88
DSP41 40,000 21.1 1850 80,000 N/A N/A 3.36 4.88
DSH40 40,000 21.1 1850 100,000 N/A N/A 3.36 4.33
D40-172 40,000 22.0 2050 160,000 150,000 135,000 3.25 4.78
D46-172H 46,000 22.0 2050 160,000 150,000 135,000 3.42 4.78
D46-590HP 46,000 22.0 2050 180,000 170,000 160,000 4.75 7.30
D50-172 50,000 22.0 2050 160,000 150,000 135,000 3.42 4.78
D52-190P 52,000 22.0 2050 180,000 170,000 160,000 3.42 4.78
D52-590P 52,000 22.0 2050 180,000 170,000 160,000 4.75 7.30
D60-190P 60,000 22.7 2050 180,000 170,000 160,000 3.42 4.78
D60-590P 60,000 22.7 2050 180,000 170,000 160,000 4.75 7.30

Tridem Axles

T69-172HP 20.8 2050 160,000 150,000 135,000 3.91 4.78 1 T78-190P Note 1 20.8 2050 180,000 170,000 160,000 3.91 4.78 1 T78-590P 20.8 2050 180,000 170,000 160,000 4.75 7.30 1

Note

1 Allowable tridem gross axle weight rating (GAWR) varies with axle ratio. Refer to the Tridem Load Ratings Section for information regarding permissible gross axle weight ratings.

Page 25

Vocational Description

  • Movement of rock, ore, gravel and minerals around mine sites and between mines and processing plants
  • High horsepower engines are typically used in this vocation
  • Vehicle routes are typically 3 to 30 miles between starts and stops
  • 90% of operation on-road with up to 10% into sandy or muddy job sites
  • Fully loaded going and empty return
  • Tractor/trailer and straight truck/material trailer combinations are considered mining vehicles. Straight trucks without trailers or trucks with equipment trailers are considered construction applications and should be reviewed based on the guidelines established for that vocation.
Typical Vehicle Types

  • Belly/Bottom Dump Trailer
  • Hopper Trailer Combinations

Ore Hauling Trailer

Trailer

Trains

Michigan Special Gravel

  • Side/Semi-End Dump
  • Super/Transfer Dump
Service Definitions

Operation 1 - Exclusive tractor/semi-trailer or truck and material trailer operation on prepared road surfaces of concrete, asphalt, gravel, crushed stone, or hard packed dirt, Grades of up to 8%.

Operation 2 - Infrequent Tractor/semi-trailer or truck and material trailer operation on prepared road surfaces of concrete, asphalt, gravel, crushed stone, or hard packed dirt with up to 10% of the total operation going into sandy or muddy mine sites. Grades of up to 20%.

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 26

Engine Max. Gross
(GVW) 		Weight (lb.)
/ GCW) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
8% Grade 		Operation 2 20% Grade Fastest Slowest
Single Axles · · ·
S23-172 23,000 19.9 1450 66,000 N/A 3.91 4.56
S25-172 25,000 19.9 1450 66,000 N/A 3.91 5.56
S23-190 23,000 21.1 1650 80,000 N/A 3.73 4.56
S26-190 26,000 21.1 1650 80,000 N/A 3.73 4.56
andem Axles
DS405 40,000 21.1 1650 80,000 N/A 3.36 4.88
DSP41 40,000 21.1 1650 80,000 N/A 3.36 4.88
DSH40 40,000 21.1 1850 80,000 N/A 3.36 5.29
D40-172 40,000 21.1 2050 165,000 140,000 3.42 4.56
D46-172/172H 46,000 22.0 2050 165,000 140,000 3.42 4.56
D46-590HP 46,000 22.0 2050 180,000 160,000 4.75 6.65
D50-172 50,000 22.0 2050 165,000 140,000 3.42 4.56
00.0 2050 180.000 160.000 3 42 4 78
D52-190P 52,000 22.0 2050 100,000 100,000 0.12 1.70
D52-190P
D52-590P 		52,000
52,000 		22.0 2050 180,000 160,000 4.75 6.65
D52-190P
D52-590P
D60-190P 		52,000
52,000
60,000 		22.0
22.0
22.7 		2050
2050
2050 		180,000
180,000
180,000 		160,000
160,000 		4.75
3.42 		6.65
T69-172HP 20.8 2050 165,000 140,000 3.91 4.78
T78-190P Note 1 20.8 2050 180,000 160,000 3.91 4.78
78-590P 20.8 2050 180,000 160,000 4.75 7.30
Note

1 Allowable tridem gross axle weight rating (GAWR) varies with axle ratio. Refer to the Tridem Load Ratings Section for information regarding permissible gross axle weight ratings.

2 The ratios 3.42 and 5.29 included in this range can be approved with max engine torque up to 1650 lb-ft.

Page 27
Motorhome

Vocational Description

  • Vehicles generally used for non-commercial transportation and as traveling domiciles for families
  • Loaded full time
  • May pull small passenger car, boat, or pick-up truck
  • Typically vehicle routes exceed 30 miles between starts and stops
  • Annual mileage generally less than 30,000
  • Typical operation is on paved roads and short distances within campgrounds and parks
  • Equipped with Automatic transmissions

Typical Vehicle Types

  • Integral Coach
  • Recreational Vehicles
Vehicle Configurations

Straight coach type vehicles with towing ability:

  • 4 x 2 straight coach
  • 6 x 2 (with fixed tag or pusher axles)
Service Definitions

Operation 1 - Loaded full time. Infrequent grades up to 8%

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 28

Engine Max. Gross Weight (lb.)
(GVW / GCW) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
8% Grade 		Fastest Slowest
Single Axles
S14-130 13,500 18.1 660 30,000 4.10 5.38
S16-130 15,500 18.1 660 30,000 4.10 5.38
S17-140 17,000 19.7 860 40,000 3.58 5.57
S19-140 19,000 19.7 860 42,000 3.58 5.57
19060S 19,000 19.7 860 42,000 3.55 5.57
S20-140 20,000 19.7 860 42,000 3.58 5.57
S21-140 21,000 19.7 860 42,000 3.58 5.57
21060S 21,000 20.1 1050 44,000 3.55 5.57
S21-172 21,000 20.1 1550 50,000 3.58 5.57
S21-190 21,000 20.1 1750 65,000 3.58 5.57
22060S 22,000 20.1 1050 45,000 3.55 5.57
23060SH 23,000 19.6 1050 45,000 3.55 5.57
S23-172 23,000 20.1 1550 50,000 3.58 5.57
S23-190 23,000 20.1 1750 65,000 3.58 5.57
Page 29

Vocational Description

  • Movement of production related products, supplies and tools between job sites
  • Movement of processing equipment and laboratories on job sites
  • Low mileage operation on road surfaces made of concrete, asphalt, maintained gravel, crushed rock or hard packed dirt
  • High horsepower engines common
  • Vehicles are typically 6x4 or 6x6 straight trucks or tractors with permanently mounted equipment for well servicing or exploration.
Typical Vehicle Types

  • Cementing Vehicle
  • Fracturing Truck
  • Geophysical Exploration

Drill Rig

Demolition

  • Rigging Truck
  • Well Serving Truck
  • Winch Truck

Tankor

Service Definitions

Operation 1 - Up to 25% job site operation, minimum 3 miles between stops, exclusive operation on prepared road surfaces. Grades of up to 12%.

Operation 2 - Infrequent Full time job site operation, frequent starts and stops, fully loaded going/empty return, low mileage. Grades of up to 12%.

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 30

Note

Note

Engine Max. Gross
(GVW / 		Weight (lb.)
/ GCW) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
12% Grade 		Operation 2
12% Grade 		Fastest Slowest
Tandem Axles
DS405 40,000 21.1 1450 100,000 N/A 3.55 5.29 ]
DSP41 40,000 21.1 1550 100,000 N/A 3.55 5.29 1
DSP41 40,000 20 1650 80,000 N/A 3.70 4.33 1
DSH40 40,000 21.1 1650 100,000 N/A 3.55 4.88 1
D40-172 40,000 21.1 2050 120,000 100,000 3.42 5.38 1
DSH44 44,000 21.1 1650 72,000 72,000 3.55 5.29 3
D46-172/172H 46,000 22.0 2050 120,000 100,000 3.42 5.38 1
D46-590HP 46,000 22.0 2050 140,000 120,000 4.75 6.65 1
D50-172 50,000 22.0 2050 120,000 100,000 3.42 5.38 1
D52-190P 52,000 22.0 2050 140,000 120,000 3.42 5.38 1
D52-590P 52,000 22.0 2050 140,000 120,000 4.75 6.65 1
D60-190P 60,000 22.7 2050 140,000 120,000 3.42 5.38 1
D60-590P 60,000 22.7 2050 140,000 120,000 4.75 6.65 1

Tridem Axles

T69-172HP 20.8 2050 120,000 100,000 3.91 4.78 2
T78-190P Note 2 20.8 2050 140,000 120,000 3.91 4.78 2
T78-590P 20.8 2050 140,000 120,000 4.75 7.30 2
Note

1 Suspension restrictions may exist with the D46-172. Please consult the Housing Structural Ratings Section for minimum housing box section requirements.

2 Allowable tridem gross axle weight rating (GAWR) varies with axle ratio. Refer to the Tridem Load Ratings Section for information regarding permissible gross axle weight ratings.

3 Applies to straight truck only, no combination vehicles.

Page 31

Vocational Description

  • 4x2 and 6x4 straight trucks, generally with automatic transmissions, used for residential refuse/recycle pickup
  • Typically a high number of stops and starts per mile
  • 6x4 straight trucks operating in commercial/industrial pickup with approximately 1 to 3 miles between stops
  • 6x4 tractor/semi-trailers or 6x4 straight trucks with roll-off containers used for transfer/relocation of material. Stops are typically more than 10 miles apart.
  • 90% of loaded operation on road surfaces of concrete, asphalt or maintained gravel and up to 10% of loaded operation into landfill, transfer or recycling sites
Typical Vehicle Types

Front/Rear/Side Loader

Liquid Waste Hauler

Roll-Off Container Truck

Pickup

  • Residential/Commercial
  • Scrap Truck
  • Sewer/Septic/Vacuum
  • Street Sweeper
  • Transfer Vehicle
Service Definitions

Operation 1 - Straight truck vehicles used for residential and commercial pick-up of refuse and recyclables. Grades up to 20%.

Operation 2 - Straight trucks with roll-off containers and tractor/semi-trailers used to transport material to transfer stations, recycling facilities, or landfill sites. Grades up to 8%.

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 32

Engine Max. Gross Weight (lb.)
(GVW) 		)
Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
20% Grade 		Fastest Slowest
Single Axles Note
S21-140 21,000 19.7 860 31,000 3.58 5.57 1
21060S 21,000 21.1 860 33,000 3.55 5.57 1
S21-172/172E 21,000 21.1 1150 45,000 3.42 5.57
S21-190 21,000 22.0 1450 55,000 3.42 5.57
22060S 22,000 21.1 860 33,000 3.55 5.57 1
23060SH 23,000 20.2 860 33,000 3.55 5.57
S23-172/172E 23,000 22.0 1150 45,000 3.42 5.57
S23-190/S23-190E 23,000 22.0 1450 55,000 3.42 5.57
S23-590 23,000 22.0 1450 55,000 4.75 6.65
S25-172/172E 25,000 22.0 1150 45,000 3.42 5.57
S26-190/S26-190E 26,000 22.0 1450 58,000 3.42 5.57
S26-590 26,000 22.0 1450 58,000 4.75 6.65
S30-190/S30-190E 30,000 22.7 1450 58,000 3.42 5.57
S30-590 30,000 22.7 1450 58,000 4.75 6.65
Note

1 The 21060S and 22060S are not approved in vehicles equipped with retarders.

Page 33

Engine (GVW) / GCW) Gear Ratios
Axle Model GAN
(Ib 		c.
/R Max SLR
) (.in) 		Torque (lb.ft.) Operation 1
20% Grade 		Operation 2
8% Grade 		Fastest Slowest
Tandem Axles Note DS405 21 1 40,000 DSP41 21.1 40 000 21 1 1850 23 D40-172 21.1 21 1 1650 5 29 4 50 000 22.0 2050 70,000 52 000 22.0 2050 72 000 2050 175,000 80 000 5.05 22.7 22.7 175 000 4 75 6 65
Note

1 The 21060S and 22060S are not approved in vehicles equipped with retarders.

2 The DS405, DSP41, and DSH40 are not approved for house to house pick-up, residential Refuse applications.

3 The ratios 3.36, 3.42, 4.63 and 4.88 included in this range can be approved with max engine torque up to 1650 lb-ft.

4 Suspension restrictions may exist with the D46-172. Please consult the Housing Structural Ratings Section for minimum housing box section requirements.

Page 34

Vocational Description

  • Specialized all wheel drive vehicles designed for rapid acceleration to airport crash sites
  • Operation on road surfaces made of concrete, asphalt, maintained gravel, crushed rock, hard packed dirt, or other similar surfaces for 90% of the total miles and sandy or muddy crash sites for the remaining 10%
  • Extremely low mileage operation
  • High horsepower engines and automatic transmissions are typical
  • Vehicle retarders are common (engine, exhaust, transmission, electro-magnetic)

Crash Fire Rescue (CFR)

Typical Vehicle Types

Airport Rescue Fire (ARF)

Rapid Intervention Vehicle

(RIV) - Emergency Service

Vehicle Configuration

4 x 4 or 6 x 6 specialized straight trucks

Service Definitions

Operation 1 - 100% loaded full time. Grades of up to 20%.

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 35

Note

Engine Max. Gross Weight (lb.)
(GVW) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
20% Grade 		Fastest Slowest
Single Axles
S23-172/172E 23,000 24.5 1450 45,000 3.07 5.57
S23-190 24,000 24.5 1650 47,000 3.07 5.57
S23-190E 24,000 24.5 1650 47,000 3.42 5.57
S23-590 24,000 24.5 1650 47,000 4.75 6.65
S25-172/172E 26,000 24.5 1450 50,000 3.07 5.57
S26-190/S26-190E 27,000 24.5 1650 50,000 3.42 5.57
S26-590 27,000 24.5 1650 50,000 4.75 6.65
S30-190/S30-190E 31,000 24.5 1650 54,000 3.42 5.57
S30-590 31,000 24.5 1650 54,000 4.75 6.65
Tandem Axles
D46-172 46,000 24.5 2450 68,000 3.21 4.78
D46-172H 50,000 24.5 2450 70,000 3.21 4.78
D50-172 52,000 24.5 2450 72,000 3.21 4.78
D52-190P 54,000 24.5 2450 76,000 3.42 4.78
D52-590P 54,000 24.5 2450 76,000 4.75 6.65
D60-190P 60,000 24.5 2450 82,000 3.42 4.78
D60-590P 60,000 24.5 2450 82,000 4.75 6.65
Note

1 Suspension restrictions may exist with the D46-172. Please consult the Housing Structural Ratings Section for minimum housing box section requirements.

Page 36
School Bus

Vocational Description

  • Transporting students to and from school and/ or school sponsored events
  • Operation on prepared road surfaces of concrete, asphalt, maintained gravel, crushed rock, or hard packed dirt
  • 2 stops per mile are considered typical
  • Automatic transmissions are typical
  • 100% load going / empty return (typical)

Typical Vehicle Types

  • Front Engine Commercial Chassis
  • Rear Engine Integral Coach
  • Front Engine Integral Coach
  • Rear Engine Commercial Chassis

Shuttle Bus

Vehicle Configuration

4 x 2 straight bus

Service Definitions

Operation 1 - Grades up to 20%

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 37

Engine Max. Gross Weight (lb.)
(GVW) 		Gear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
20% Grade 		Fastest Slowest
Single Axles
S14-130 13,500 16.5 605 25,000 4.10 5.38
S16-130 15,500 16.5 605 25,000 4.10 5.38
S17-140 17,000 19.7 860 29,000 3.91 5.57
S19-140 19,800 19.7 860 31,000 3.91 5.57
19060S 19,800 20.1 860 31,000 3.90 5.57
S20-140 20,000 19.8 860 31,000 3.58 5.57
S21-140 21,000 19.8 860 31,000 3.58 5.57
21060S 21,000 20.1 860 33,000 3.90 5.57
S21-172 21,000 20.1 900 38,000 3.91 6.14
22060S 22,000 20.1 860 34,000 3.90 5.57
23060SH 23,000 19.3 860 34,000 3.90 5.57
S23-172 23,000 20.1 900 38,000 3.91 6.14
Page 38
Yard Tractor

Vocational Description

  • Transporting trailers on/off vessels, into/out of storage areas, around loading docks
  • Operation on prepared road surfaces of concrete, asphalt or maintained gravel
  • 6 stops per mile are considered typical
  • Annual Mileage: very low
  • Restricted Speed (< 25 mph)</li>
Typical Vehicle Types

Port Tractor

Rail Yard Spotter

Trailer Spotter

Yard Jockev

Vehicle Configuration

4 x 2 tractor 6 x 4 tractor

Service Definitions

(vocational description applies to all operations)

Operation 1 - Grades up to 3%

Housing Structural Ratings

See the Housing Structural Ratings section.

Page 39

Gear ear Ratios
Axle Model Max.
GAWR
(lb.) 		Max SLR
(.in) 		Torque (lb.ft.) Operation 1
3% Grade 		Fastest Slowest
Single Axles Note
S23-172 30,000 19.6 660 81,000 6.14 6.83 | 1
S23-190 30,000 19.6 660 100,000 6.14 6.83
000 100 40.000 10.0 000 100 000 0.14 0.00

100,000

6.65

7.30

Tandem Axles

S30-590

DSH40 40,000 19.6 1550 125,000 5.57 6.50
D40-172 40,000 19.6 1650 160,000 6.14 6.83
D46-172H 46,000 19.6 1650 160,000 6.14 6.83
D50-172 50,000 19.6 1650 160,000 6.14 6.83
D52-190P 52,000 19.6 1650 160,000 6.14 6.83
D60-190P 60,000 19.6 1650 160,000 6.14 6.83

660

Note

1 0.50" housing wall thickness and 2.24" diameter axle shafts are required.

42,000

19.6

Page 40

Housing Dimensions (Standard Track Width)

Drive Axle Model - Note 1
(Nominal GAWR - 13,500 lbs.) 		Housing Box
Section (in.)
(H x W x T) 		Inner Bearing Shoulder to
Inner Bearing Shoulder (in.) 		Approximate
Track Width
(in.) 		Spindle
Diameters
(Inner/Outer) 		Note
4.25 x 4.25 x .39 64.5-65.0 70
S14-130 66.5-67.3 72 Note 4 7
68.8-69.3 74
Gross Axle Ratings Based on the Use of Narrow or Wide Track Housings (lbs.)
Housing Box Section (in.)
(H x W x T) 		70 in. Maximum Track Width 74 in. Maximum Track Width Note
4.25 x 4.25 x .39 13,500 13,500 5,6

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 70 in. Maximum 72 in. Maximum 74 in. Maximum 76 in. Maximum Note
(H x W x T) Track Width Track Width Track Width Track Width
4.25 x 4.25 x .39 Not Approved Not Approved Not Approved Not Approved 2.5.6

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.) 70 in. Maximum 72 in. Maximum 74 in. Maximum 76 in. Maximum Note
(H x W x T) Track Width Track Width Track Width Track Width
4.25 x 4.25 x .39 Not Approved Not Approved Not Approved Not Approved 2,5,6

Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 72 in.

2 The S14-130 is not approved with single outset wheels.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Spindle dimensions vary with customer.

5 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in.

6 Track widths are nominal and may vary with wheel equipment.

7 The S14-130 is not approved with suspension capacity rated above 16,000 lbs.

Page 41

Housing Dimensions (Standard Track Width)

Drive Axle Model - Note 1
(Nominal GAWR - 15,500 lbs.) 		Housing Box
Section (in.)
(H x W x T) 		Inner Bearing Shoulder to
Inner Bearing Shoulder (in.) 		Approximate
Track Width (in.) 		Spindle
Diameters
(Inner/Outer) 		Note
4.25 x 4.25 x .39 64.2-64.88 70
S16-130 65.0-66.5 72 Note 4 7
68.8-69.2 74

Gross Axle Ratings Based on the Use of Narrow or Wide Track Housings (lbs.)

Housing Box Section (in.)
(H x W x T) 		70 in. Maximum Track Width 74 in. Maximum Track Width Note
4.25 x 4.25 x .39 15,500 14,500 5,6

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.)
(H x W x T) 		70 in. Maximum
Track Width 		71 in. Maximum
Track Width 		72 in. Maximum
Track Width 		74 in. Maximum
Track Width 		Note
4.25 x 4.25 x .39 Not Approved Not Approved Not Approved Not Approved 2,5,6

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.) 70 in. Maximum 72 in. Maximum 74 in. Maximum 76 in. Maximum Note
(H x W x T) Track Width Track Width Track Width Track Width
4.25 x 4.25 x .39 Not Approved Not Approved Not Approved Not Approved 2,5,6

Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 72 in.

2 The S16-130 is not approved with single outset wheels.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Spindle dimensions vary with customer.

5 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in.

6 Track widths are nominal and may vary with wheel equipment.

7 The S16-130 is not approved with suspension capacity rated above 17,000 lbs.

Page 42

Housing Dimensions (Standard Track Width)
Drive Axle Model - Note 1
(Nominal GAWR - 17,000 lbs.) 		Housing Box Section (in.)
(H x W x T) 		Spindle Diameters
(Inner/Outer) 		Spindle Type Note
S17-140 5.24 x 4.61 x .38 3.250/2.625 L 6
S17-140H 5.24 x 4.61 x .43 3.750/3.250 R 6

Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)

Housing Box Section (in.) (H x W x T) 78 in. Maximum Track Width
5.24 x 4.61 x .38 Not Available
5.24 x 4.61 x .43 Not Available

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) (H x W x T) 76 in. Maximum Track Width Note
5.24 x 4.61 x .38 Not Approved 2
5.24 x 4.61 x .43 17,000 3,5

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 4

Housing Box Section (in.)
(H x W x T) 		72 in. Track
(Standard Housing) 		78 in. Track
(Wide Track Housing) 		75 in. Track
(Outset Wheels)
5.24 x 4.61 x .38 Not Approved Not Available Not Approved
5.24 x 4.61 x .43 Not Approved Not Available Not Approved

Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 72 in.

2 The S17-140 is not approved with single outset wheels.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Track widths are nominal and may vary with wheel equipment.

  • 5 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.
  • 6 The 0.38" wall thickness housings are not approved with suspension capacities rated above 21,000 pounds.

The 0.43" wall thickness housings are not approved with suspension capacities rated above 23,000 pounds.

Page 43

Housing Dimensions (Standard Track Width)
Drive Axle Model - Note 1
(Nominal GAWR - 19,000 lbs.) 		Housing Box Section (in.)
(H x W x T) 		Spindle Diameters
(Inner/Outer) 		Spindle Type Note
S19-140 5.24 x 4.61 x .38 3.250/2.625 L 6
19060 5.24 x 4.61 x .38 3.250/2.625 R 6
S19-140H 5.24 x 4.61 x .43 3.750/3.250 R 6

Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)

Housing Box Section (in.) (H x W x T) 78 in. Maximum Track Width
5.24 x 4.61 x .38 Not Available
5.24 x 4.61 x .43 Not Available

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) (H x W x T) 75 in. Maximum Track Width
5.24 x 4.61 x .38 Not Approved 2
5.24 x 4.61 x .43 19,000 4,5

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.)
(H x W x T) 		72 in. Track
(Standard Housing) 		78 in. Track
(Wide Track Housing) 		75 in. Track
(Outset Wheels)
5.24 x 4.61 x .38 Not Approved Not Available Not Approved
5.24 x 4.61 x .43 Not Approved Not Available Not Approved
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 72 in.

2 The 19060S and S19-140 are not approved with single outset wheels.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Track widths are nominal and may vary with wheel equipment.

  • 5 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.
  • 6 The 0.38" wall thickness housings are not approved with suspension capacities rated above 21,000 pounds.

The 0.43" wall thickness housings are not approved with suspension capacities rated above 23,000 pounds.

Page 44

Housing Dimensions (Standard & SelecTTrac™ Width)
Drive Axle Model - Note 1
(Nominal GAWB - 20 000 lbs ) 		Housing Box Section (in.)
(H x W x T) 		Spindle Diameters Spindle Type Note
Standard Track SelectTTrac™ (initial) eatory
S20-140 5.24 x 4.61 x .38 5.24 x 4.61 x .38 3.750/3.250 R 6
S20-140H 5.24 x 4.61 x .43 5.24 x 4.61 x .43 3.750/3.250 R 6

Gross Axle Ratings Based on the Use of SelecTTrac™ Housings (lbs.)

Housing Box Section (in.) (H x W x T) 75 in. Maximum Track Width SelecTTrac™ Note
5.24 x 4.61 x .38 20,000 2,5
Housing Box Section (in.) (H x W x T) 76 in. Maximum Track Width SelecTTrac™ Note
5.24 x 4.61 x .43 20,000 2,5

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 75 in. Maximum Track Width 78 in. Maximum Track Width Note
(H x W x T) (Standard Track Housing) (SelecTTrac™ Housing)
5.24 x 4.61 x .38 17,000 17,000 2,3,5,7
1
Housing Box Section (in.) 76 in. Maximum Track Width 78 in. Maximum Track Width Note
(H x W x T) (Standard Track Housing) (SelecTTrac™ Housing)

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 4

Housing Box Section (in.)
(H x W x T) 		73 in. Maximum
Track Width
(Standard Housing) 		75 in. Maximum
Track Width
(SelecTTrac™
Housing) 		75 in. Maximum
Track Width
(Standard w/Outset) 		78 in. Maximum
Track Width
(Select w/Outset)
5.24 x 4.61 x .38 Not Approved Not Approved Not Approved Not Approved
-
Housing Box Section (in.)
(H x W x T) 		73 in. Maximum
Track Width
(Standard Housing) 		76 in. Maximum
Track Width
(SelecTTrac™
Housing) 		76 in. Maximum
Track Width
(Standard w/Outset) 		78 in. Maximum
Track Width
(Select w/Outset) 		Note
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.

  • 2 Track widths are nominal and may vary with wheel equipment.
  • 3 The S20-140 is not approved with single tires and outset wheels.
  • 4 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.
  • 5 Nominal gross axle weight rating (GAWR) is based on a minimum axle mounting centers of 40 in.
  • 6 The 0.38" wall thickness housings are not approved with suspension capacities rated above 21,000 pounds.

The 0.43" wall thickness housings are not approved with suspension capacities rated above 23.000 pounds.

7 Single tires with outset wheels beyond 2.0 in. are not approved.

Page 45

Housing Dimensions
Drive Axle Model - Note 1 Housing Box Section (in.) (H x W x T) Spindle Diameters Spindle Type Noto
lbs.) Standard Track SelectTTrac™ Wide Track (Inner/Outer) r) Spinale Type
21060S, S21-140 5.24 x 4.61 x .43 5.24 x 4.61 x .43 5.24 x 4.61 x .50 3.750/3.250 5,6,7,8
S21-172, S21-175, S21-190 5.24 x 4.61 x .50 Not Available Not Available Р 8
S21-172, S21-175, S21-190 5.24 x 4.61 x .43 5.24 x 4.61 x .50 5.24 x 4.61 x .63 n 5,6,8
S21-172H, S21-175H, S21-190H 5.24 x 4.61 x .63 Not Available Not Available

Gross Axle Ratings Based on the Use of SelecTTrac™ or Wide Track Housings (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track Width
SelecTTrac™ 		78.5 in. Maximum Track Width
Wide Track 		Note
5.24 x 4.61 x .43 20,000 Not Available 2,5,6
5.24 x 4.61 x .50 21,000 19,000 2,7
5.24 x 4.61 x .56 Not Available 21,000 2
5.24 x 4.61 x .63 Not Available 21,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track
(Standard Track Housing) 		79 in. Maximum Track
(SelecTTrac™ Housing) 		82 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .43 19,500 18,000 Not Available 2,4,5,6
5.24 x 4.61 x .50 Not Available Not Available 17,000 2,4,7
5.24 x 4.61 x .56 Not Available Not Available 19,000 2,4
5.24 x 4.61 x .63 Not Available Not Available 21,000 2,4
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

  • 3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.
  • 4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.
  • 5 SelecTTrac is only available in S21-140, S21-172, and S21-190.
  • 6 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac™.
  • 7 S21-140 is not available with wide track housings.
  • 8 The 0.43" wall thickness housings are not approved with suspension capacities rated above 24,000 pounds.

The 0.50" or above wall thickness housings are not approved with suspension capacities rated above 26,000 pounds.

Page 46

21,000 lbs. Housing Structural Ratings (continued)

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 4

Housing Box Section (in.)
(H x W x T) 		73 in. Maximum Track
(Standard Track Housing) 		76 in. Track
(SelecTTrac™ Housing) 		78.5 in. Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .43 29,000 26,000 Not Available 2,3,5,6
5.24 x 4.61 x .50 Not Available Not Available 26,000 2,3,7
5.24 x 4.61 x .56 Not Available Not Available 29,000 2,3
5.24 x 4.61 x .63 Not Available Not Available 31,000 2,3
Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track
(Standard Track Housing) 		79 in. Track
(Select w/Outset) 		82 in. Track
(Wide w/Outset) 		Note
5.24 x 4.61 x .43 29,000 23,000 Not Available 2,3,5,6
5.24 X 4.61 X .50 Not Available Not Available 23,000 2,3,5,7
5.24 x 4.61 x .50 Not Available
Not Available 		Not Available
Not Available 		23,000 24,000 2,3,5,7
2,3

Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in, and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.

5 SelecTTrac is only available in S21-140, S21-172, and S21-190.

6 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac™.

7 S21-140 is not available with wide track housings.

8 The 0.43" wall thickness housings are not approved with suspension capacities rated above 24,000 pounds.

The 0.50" or above wall thickness housings are not approved with suspension capacities rated above 26,000 pounds.

Page 47

Housing Dimensions
Drive Axle Model - Note 1
(Nominal GAWB - 22 000 lbs) 		Housing Box Section (in.)
(H x W x T) 		Spindle Diameters Spindle Type Note
Standard Track Wide Track (initial) eatory
22060S 5.24 x 4.61 x .43 5.24 x 4.61 x .50 3.750/3.250 R 2 [
Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)
Housing Box Section (in.) 76 in. Maximum Track Width 78.5 in. Maximum Track Width Note
(H x W x T) SelecTTrac™ Wide Track
5.24 x 4.61 x .50 Not Available 19,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track
(Standard Track Housing) 		79 in. Maximum Track
(SelecTTrac™ Housing) 		82 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .43 19,500 Not Available Not Available 3
5.24 x 4.61 x .50 Not Available Not Available Not Approved

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 4

Housing Box Section (in.)
(H x W x T) 		73 in. Maximum Track
(Standard Housing) 		76 in. Maximum Track
(SelecTTrac™ Housing) 		78.5 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .43 29,000 Not Available Not Available 4
5.24 x 4.61 x .50 Not Available Not Available 23,000 2,4
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.

4 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

5 The 0.43" wall thickness housings are not approved with suspension capacities rated above 24,000 pounds.

The 0.50" or above wall thickness housings are not approved with suspension capacities rated above 26,000 pounds.

Page 48

Housing Dimensions
Drive Axle Model - Note 1 Housing Box Section (in.) (I lousing Box Section (in.) (H x W x T) Spindle Diameters Spindle Nota
(Nominal GAWR - 23,000 lbs.) Standard Track SelectTTrac™ Wide Track (Inner/Outer) Туре Note
S23-172, S23-175 5.24 x 4.61 x .43 5.24 x 4.61 x .50 5.24 x 4.61 x .63 2
23060SH, S23-190, S23-590 5.24 x 4.61 x .50 5.24 x 4.61 x .50 5.24 x 4.61 x .63 3.750/3.250 R 2,5,6
S23-172H, S23-175H, S23-190H 5.24 x 4.61 x .63 Not Available 5.24 x 4.61 x .63 2

Gross Axle Ratings Based on the Use of SelecTTrac™ or Wide Track Housings (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track Width
SelecTTrac™ 		78.5 in. Maximum Track Width
Wide Track 		Note
5.24 x 4.61 x .43 Not Available Not Available 2
5.24 x 4.61 x .50 22,000 Not Available 2,5,6
5.24 x 4.61 x .63 Not Available 23,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track
(Standard Track Housing) 		79 in. Maximum Track
(SelecTTrac™ Housing) 		82 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .43 20,000 18,000 Not Available 2,4,5
5.24 x 4.61 x .50 22,000 20,000 Not Available 2,4,5,6
5.24 x 4.61 x .63 23,000 Not Available 21,000 2,4

Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

  • 4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.
  • 5 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac™.
  • 6 The 23060SH is not available in SelecTTrac or Wide Track housings.

7 The 0.43" wall thickness housings are not approved with suspension capacities rated above 24,000 pounds. The 0.50" wall thickness housings are not approved with suspension capacities rated above 26,000 pounds.

The 0.63" wall thickness housings are not approved with suspension capacities rated above 31,000 pounds.

Page 49

23,000 lbs. Housing Structural Ratings (continued)

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.)
(H x W x T) 		73 in. Track
(Standard Track Housing) 		76 in. Track
(SelecTTrac™ Housing) 		78.5 in. Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .43 29,000 26,000 Not Available 2,3,5
5.24 x 4.61 x .50 30,000 29,000 Not Available 2,3,5,6
5.24 x 4.61 x .63 32,500 Not Available 31,000 2,3
Housing Box Section (in.)
(H x W x T) 		76 in. Track
(Standard w/Outset) 		79 in. Track
(Select w/Outset) 		82 in. Track
(Wide w/Outset) 		Note
Housing Box Section (in.)
(H x W x T)
5.24 x 4.61 x .43 		76 in. Track
(Standard w/Outset)
26,000 		79 in. Track
(Select w/Outset)
23,000 		82 in. Track
(Wide w/Outset)
Not Available 		Note 2,3,4,5
Housing Box Section (in.)
(H x W x T)
5.24 x 4.61 x .43
5.24 x 4.61 x .50 		76 in. Track
(Standard w/Outset)
26,000
28,000 		79 in. Track
(Select w/Outset)
23,000
26,000 		82 in. Track
(Wide w/Outset)
Not Available
Not Available 		Note
2,3,4,5
2,3,4,5,6
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.

5 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac™.

6 The 23060SH is not available in SelecTTrac or Wide Track housings.

7 The 0.43" wall thickness housings are not approved with suspension capacities rated above 24,000 pounds.

The 0.50" wall thickness housings are not approved with suspension capacities rated above 26,000 pounds.

The 0.63" wall thickness housings are not approved with suspension capacities rated above 31,000 pounds.

Page 50

Housing Dimensions
Drive Axle Model - Note 1 Housing Box Section (in.) (H x W x T) Spindle Diameters Spindle Note
(Nominal GAWR - 25,000 lbs.) Standard Track SelectTTrac™ Wide Track (Inner/Outer) Туре NOLE
S25-172, S25-175 5.24 x 4.61 x .50 Not Available 5.24 x 4.61 x .63 3.750/3.250 R 2,5
Gross Axle Ratings Based on the Use of SelecTTrac™ or Wide Track Housings (lbs.)
Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track Width
SelecTTrac™ 		78.5 in. Maximum Track Width
Wide Track 		Note
5.24 x 4.61 x .50 22,000 Not Available 2, 5
5.24 x 4.61 x .63 Not Available 24,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track
(Standard Track Housing) 		79 in. Maximum Track
(SelecTTrac™ Housing) 		82 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .50 22,000 20,000 Not Available 2,4,5
5.24 x 4.61 x .63 Not Available Not Available 21,000 2,4

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.)
(H x W x T) 		73 in. Maximum Track
(Standard Track Housing) 		76 in. Maximum Track
(SelecTTrac™ Housing) 		78.5 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .50 30,000 29,000 Not Available 2,3,5
5.24 x 4.61 x .63 Not Available Not Available 31,000 2,3
Housing Box Section (in.)
(H x W x T) 		76 in. Track
(Standard w/Outset) 		79 in. Track
(Select w/Outset) 		82 in. Track
(Wide w/Outset) 		Note
5.24 x 4.61 x .50 28,000 26,000 Not Available 2,3,4,5
5 24 x 4 61 x 63 Not Available Not Available 26,000 234

Note

  • 1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.
  • 2 Track widths are nominal and may vary with wheel equipment.
  • 3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.
  • 4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.
  • 5 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac™.
  • 6 The 0.50 in. wall thickness housings are not approved with suspension capacities rated above 26,000 lbs.

The 0.63 in. wall thickness housings are not approved with suspension capacities rated above 31,000 lbs.

Page 51

Housing Dimensions
Drive Axle Model - Note 1
(Nominal GAWB - 26 000 lbs ) 		Housing Box
(H x V 		: Section (in.)
V x T) 		Spindle Diameters Spindle Type Note
Standard Track Wide Track (initial) eatory
S26-190, S26-590 5.24 x 4.61 x .63 5.24 x 4.61 x .63 3.750/3.250 R 2

Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)

Housing Box Section (in.) 76 in. Maximum Track Width 78.5 in. Maximum Track Width Note
(H x W x T) SelecTTrac™ Wide Track
5.24 x 4.61 x .63 Not Available 24,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 76 in. Maximum Track 79 in. Maximum Track 82 in. Maximum Track Note
(H x W x T) (Standard Track Housing) (SelecTTrac™ Housing) (Wide Track Housing)
5.24 x 4.61 x .63 26,000 Not Available 21,000 2,4

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section
(in.) (H x W x T) 		73 in. Track
(Standard
Housing) 		76 in. Track
(Standard w/
Outset) 		76 in. Track
(SelecTTrac™
Housing) 		78.5 in. Track
(Wide Track
Housing) 		82 in. Track
(Wide w/Outset) 		Note
5.24 x 4.61 x .63 32,000 31,000 Not Available 31,000 27,000 2,3,4
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

  • 3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.
  • 4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.

5 The 0.63" wall thickness housings are not approved with suspension capacities rated above 31,000 pounds.

Page 52

Housing Dimensions
Drive Axle Model - Note 1 Housing Box Sect Spindle Diameters Spindle
(Nominal GAWR - 30,000 lbs.) Standard Track Wide/Wide-Wide Track (Inner/Outer) Туре
S30-190, S30-590 5.91 x 5.31 x .63 5.91 x 5.31 x .63 4.125 / 3.500 W 2

Gross Axle Ratings Based on the Use of Wide or Wide-Wide Track Housings (lbs.)

Housing Box Section (in.) 74.1 in. Maximum Track Width 76 in. Maximum Track Width Note
(H x W x T) Wide Track Wide-Wide Track
5.91 x 5.31 x .63 30,000 29,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 76 in. Maximum Track 78 in. Maximum Track 80 in. Maximum Track Note
(H x W x T) (Standard Track Housing) (Wide Track Housing) (Wide-Wide Track Housing)
5.91 x 5.31 x .63 28,000 26,000 24,000 2,4

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.)
(H x W x T) 		72.5 in. Track
(Standard Housing) 		74.1 in. Track
(Wide Housing) 		76 in. Track
(Wide-Wide Track Housing) 		Note
5.91 x 5.31 x .63 36,000 35,000 34,000 2,3
Housing Box Section (in.)
(H x W x T) 		76 in. Track
(Standard w/Outset) 		78 in. Track
(Wide w/Outset) 		80 in. Track
(Wide-Wide w/Outset) 		Note
5.91 x 5.31 x .63 34,000 32,000 31,000 2,3,4
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 72.5 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

  • 4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.
  • 5 30,000-pound-rated drive axle models are not approved with suspension capacities rated above 31,000 pounds.
Page 53

Housing Dimensions
Drive Axle Model - Note 1
(Nominal GAWB - 35 000 lbs) 		Housing Box Section (in.)
(H x W x T) 		Spindle Diameters Spindle Type Note
Standard Track Wide Track
S35-190FT, S35-590FT 5.91 x 5.31 x .63 Not Available 4.125/3.500 W 2

Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)

Housing Box Section (in.) 76 in. Maximum Track Width
(H x W x T) Wide Track
5.91 x 5.31 x .63 Not Available

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 76 in. Maximum Track 80 in. Maximum Track
(H x W x T) (Standard Track Housing) (Wide Track Housing)
5.91 x 5.31 x .63 Not Approved

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.) 72 in. Track 76 in. Track Note
(H x W x T) (Standard Housing) (Wide Track)
5.91 x 5.31 x .63 36,000 Not Approved 2,3
Housing Box Section (in.) 76 in. Track 80 in. Track
(H x W x T) (Standard w/Outset) (Wide w/Outset)
5.91 x 5.31 x .63 Not Approved Not Approved ]
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 72.3 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 S35-190FT and S35-590FT is not approved with single outset wheels.

5 35,000-pound-rated drive axle model is not approved with suspension capacities rated above 35,000 pounds.

Page 54

Housing Dimensions
Drive Axle Model - Note 1 Housing Box Section (in.) (H x W x T) Spindle Diameters Spindle Noto
(Nominal GAWR - 40,000 lbs.) Standard Track SelectTTrac™ Wide Track (Inner/Outer) Type Туре NOLE
D40-155 5.24 x 4.61 x .38 Not Available Not Available 2,4,7
DS404, DSP40 5.24 x 4.61 x .38 Not Available 5.24 x 4.61 x .50 2,6,7
D40-155H 5.24 x 4.61 x .43 5.24 x 4.61 x .43 Not Available 3.750/3.250 R 2,4
DS405, DSP41, DSH40 5.24 x 4.61 x .43 Not Available 5.24 x 4.61 x .50 2,6
D40-172 5.24 x 4.61 x .43 5.24 x 4.61 x .50 5.24 x 4.61 x .63 2,4

Gross Axle Ratings Based on the Use of SelecTTrac™ or Wide Track Housings (lbs.)

Housing Box
(H x V 		Section (in.)
V x T) 		76 in. Maximum Track Width
SelecTTrac™ 		78.5 in. Maximum Track Width
Wide Track 		Note
5.24 x 4 .61 x .38 Not Available Not Available 2
5.24 x 4 .61 x .43 40,000 Not Available 2,4
5.24 x 4 .61 x .50 Not Available 39,000 2,6
5.24 x 4 .61 x .63 Not Available 40,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.)
(H x W x T) 		75 in. Maximum Track
(Standard Track Housing) 		78 in. Maximum Track
(SelecTTrac™ Housing) 		82 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .38 34,000 Not Available Not Available 2,5,6
5.24 x 4.61 x .43 40,000 37,500 Not Available 2,4,5,6
5.24 x 4.61 x .50 Not Available Not Available 35,000 2,5,6
5.24 x 4.61 x .63 Not Available Not Available 40,000 2,5,6
Note

  • 1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.
  • 2 Track widths are nominal and may vary with wheel equipment.
  • 3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.
  • 4 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac™ housings.
  • 5 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as LMS or LMSi) is required.
  • 6 For detailed track versus allowable gross axle weight rating information when outset wheels are used, see 40,000 lb. Tandem Rating Chart.
  • 7 The minimum housing wall thickness for Fuel Haulers is 0.43". The DS405, DSP41, and D40-155H need to be used instead of DS404, DSP40, and D40-155, respectively.
  • 8 The 0.38" wall thickness housings are not approved with suspension capacity rated above 42,000 pounds.

The 0.43" and 0.50" wall thickness housings are not approved with suspension capacity rated above 46.000 pounds.

The 0.63" wall thickness housings are not approved with suspension capacities rated above 52,000 pounds.

Page 55

40,000 lbs. Housing Structural Ratings (continued)

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.)
(H x W x T) 		73 in. Track
(Standard Housing) 		76 in. Track
(SelecTTrac™ Housing) 		78.5 in. Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .38 54,000 Not Available Not Available 2,3
5.24 x 4.61 x .43 58,000 58,000 Not Available 2,3,4
5.24 x 4.61 x .50 Not Available Not Available 53,000 2,3,6
5.24 x 4.61 x .63 Not Available Not Available 62,000 2,3
Housing Box Section (in.)
(H x W x T) 		75 in. Track
(Standard w/Outset) 		78 in. Track
(Select w/Outset) 		82 in. Track
(Wide w/Outset) 		Note
5.24 x 4.61 x .38 40,000 Not Available Not Available 2,3,5
5.24 x 4.61 x .43 48,000 44,000 Not Available 2,3,4,5
5.24 x 4.61 x .50 Not Available Not Available 43,000 2,3,5,6
5.24 x 4.61 x .63 Not Available Not Available 52,000 2,3,5
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in and a maximum track width of 73 in

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac™ housings.

  • 5 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as LMS or LMSi) is required.
  • 6 For detailed track versus allowable gross axle weight rating information when outset wheels are used, see 40,000 lb. Tandem Rating Chart.

7 The 0.38" wall thickness housings are not approved with suspension capacity rated above 42,000 pounds.

The 0.43" and 0.50" wall thickness housings are not approved with suspension capacity rated above 46,000 pounds.

The 0.63" wall thickness housings are not approved with suspension capacities rated above 52,000 pounds.

Page 56

40,000 lbs. Housing Structural Ratings (continued)

Minimum Box Section Suspension Requirements (in.) (H x W x T) Manufacturer Model Туре Application USA Canada 800-40k Chalmers Rubber Spring walking beam Vocationa 5.24 x 4.61 x .43 Trailing Arm Air Ride lendricksor HAS 40LH Linehaul 5.24 x 4.61 x .38 5.24 x 4.61 x .38 endrickson HAS 400 Trailing Arm Air Ride )n-off highway 5.24 x 4.61 x .43 lendrickson HAS 402 Trailing Arm Air Ride n-off highwa lendrickson HMX 400 Rubber Spring walking bear Vocational 5.24 x 4.61 x .43 5.24 x 4.61 x .43 Hendrickson HN 402 Rubber Spring walking beam Vocational 5.24 x 4.61 x .43 5.24 x 4.61 x .43 Air Ride 5.24 x 4.61 x .43 Hendrickson HTB LT On-highway 5.24 x 4.61 x .43 Hendrickson Primaax Trailing Arm Air Ride On-off highway 5.24 x 4.61 x .43 5.24 x 4.61 x .43 Hendricksor RS 403 Rubber Spring walking bea Vocational 5.24 x 4.61 x .43 5.24 x 4.61 x .43 Hendrickson R 403 Solid walking beam Vocational 5.24 x 4.61 x .43 5.24 x 4.61 x .43 ndricksor Steel Spring walking beam Vocational 5.24 x 4.61 x .43 5.24 x 4.61 x .43 Neway ARDAB-240-5 Air Beam On-highway 5.24 x 4.61 x .38 5.24 x 4.61 x .38 240AR Trailing Arm Air Ride On-highway 5.24 x 4.61 x .43 5.24 x 4.61 x .43 Trailing Arm Air Ride On-highway 5.24 x 4.61 x .38 102W 4 spring On-highway 5.24 x 4.61 x .38
Housing Wall Thickness Requirements for Various Non-Proprietary Suspensions - Note 7

Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac™ housings.

  • 5 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as LMS or LMSi) is required.
  • 6 For detailed track versus allowable gross axle weight rating information when outset wheels are used, see 40,000 lb, Tandem Rating Chart,

7 The 0.38" wall thickness housings are not approved with suspension capacity rated above 42,000 pounds.

The 0.43" and 0.50" wall thickness housings are not approved with suspension capacity rated above 46,000 pounds.

The 0.63" wall thickness housings are not approved with suspension capacities rated above 52,000 pounds.

Page 57

Housing Dimensions
Drive Ayle Model - Note 1 Housing Box Section (in.) (H x W x T) Spindle Diameters Spindle
Drive Axle Model - Note 1
(Nominal GAWR - 44,000 lbs.) 		Standard Track Intermediate
Track 		Wide Track - Spindle Diameters
(Inner/Outer) 		Туре Note
DSH44 5.24 x 4.61 x .50 5.24 x 4.61 x .50 5.24 x 4.61 x .50 3.750/3.250 R 2
Gross Axle Ratings Based on the Intermediate or Wide Track Housings (lbs.)
Housing Box Section (in.) 76 in. Maximum Track Width 78.5 in. Maximum Track Width Note
(H x W x T) Intermediate Track Wide Track
5.24 x 4.61 x .50 43,000 39,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 75 in. Maximum Track 79 in. Maximum Track 82 in. Maximum Track Note
(H x W x T) (Standard Track Housing) (Inter Track Housing) (Wide Track Housing)
5.24 x 4.61 x .50 43,000 38,000 35,000 2,4,5

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) (See Note 3)

Housing Box Section (in.)
(H x W x T) 		73 in. Track
(Standard Housing) 		76 in. Track
(Intermediate Track
Housing) 		78.5 in. Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .50 62,000 58,000 53,000 2,3
Housing Box Section (in.)
(H x W x T) 		76 in. Track
(Standard w/Outset) 		79 in. Track
(Intermediate w/Outset) 		82 in. Track
Wide w/Outset 		Note
5.24 x 4.61 x .50 56,000 48,000 45,000 2,3,4
Note

  • 1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 38 in. and a maximum track width of 73 in.
  • 2 Track widths are nominal and may vary with wheel equipment.
  • 3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.
  • 4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as LMS or LMSi) is required.
  • 5 For detailed track versus allowable gross axle weight rating information when outset wheels are used, see 44,000 lb. Tandem Rating Chart.
  • 6 The 0.50 in. wall thickness housings are not approved with suspension capacities rated above 50.000 lbs.
Page 58

Housing Dimensions
Drive Axle Model - Note 1 Housing Box Section (in.) (H x W x T) Spindle Diameters Spindle Note
(Nominal GAWR - 40,000 lbs.) Standard Track SelecTTrac™ Wide Track (Inner/Outer) Туре NOTE
D46-172 5.24 x 4.61 x .50 5.24 x 4.61 x .50 5.24 x 4.61 x .63 - 3.750/3.250 R р 2
D46-172H, D46-590HP 5.24 x 4.61 x .63 Not Available 5.24 x 4.61 x .63 | n 2

Gross Axle Ratings Based on the Use of SelecTTrac™ or Wide Track Housings (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track Width
SelecTTrac™ 		78.5 in. Maximum Track Width
Wide Track 		Note
5.24 x 4.61 x .50 44,000 Not Available 2,6
5.24 x 4.61 x .63 Not Available 46,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track
(Standard Track Housing) 		79 in. Maximum Track
(SelecTTrac™ Housing) 		82 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .50 44,000 40,000 Not Available 2,4,5,6
5.24 x 4.61 x .63 46,000 Not Available 42,000 2,4,5

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.)
(H x W x T) 		73 in. Track
(Standard Housing) 		76 in. Maximum Track
(SelecTTrac™ Housing) 		78.5 in. Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .50 62,000 58,000 Not Available 2,3,6
5.24 x 4.61 x .63 65,000 Not Available 62,000 2,3
Housing Box Section (in.)
(H x W x T) 		76 in. Track
(Standard w/Outset) 		79 in. Track
(Select w/Outset) 		82 in. Track
(Wide w/Outset) 		Note
5.24 x 4.61 x .50 58,000 52,000 Not Available 2,3,4,6
5.24 x 4.61 x .63 62,000 Not Available 52,000 2,3,4
Page 59

46,000 lbs. Housing Structural Ratings (continued)

Suspension Minimum Box Section Manufacturer Model Type Application Requirements (in.) (H x W x T) Rubber Spring walking beam Chalmers 800-46k Vocational 5.24 x 4.61 x .56 HAS 460 Trailing Arm Air Ride On-off highway 5.24 x 4.61 x .50 Hendrickson HMX 460 Rubber Spring walking beam On-off highway 5.24 x 4.61 x .50 HN 462 5.24 x 4.61 x .50 Hendrickson Rubber Spring walking beam Vocational Hendrickson RT(E) 463 Steel Spring walking beam Vocational 5.24 x 4.61 x .50 Hendricksor RS 463 Rubber Spring walking beam Vocational 5.24 x 4.61 x .50 Hendrickson Primaax 460 Trailing Arm Air Ride On-off highway 5.24 x 4.61 x .50 Vocationa Hendrickson R 463 Solid walking beam 5.24 x 4.61 x .50 Neway AD-246 Trailing Arm Air Ride Vocational 5.24 x 4.61 x .50 Neway ADZ-246 Trailing Arm Air Ride Vocational 5.24 x 4.61 x .50 Air Link On-off highway Raydan Air Bag walking beam 5.24 x 4.61 x .56 Reyco 102AR Trailing Arm Air Ride On-highway 5.24 x 4.61 x .50 Reyco 102W 4 spring On-highway 5.24 x 4.61 x .50 Ridewell RD202S Rubber Spring Torque Beam Vocational 5.24 x 4.61 x .56 Ridewell RAD-2270 8 Air Bag Beam Vocational 5.24 x 4.61 x .50 Ridewell RAD-241-05 Trailing Arm Air Ride Vocationa 5.24 x 4.61 x .50
Housing Wall Thickness Requirements for Various Non-Proprietary Suspensions - Note 7

Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 35.88 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

  • 3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.
  • 4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as LMS or LMSi) is required.
  • 5 For detailed track versus allowable gross axle weight rating information when outset wheels are used, see 46,000 lb. Tandem Rating Chart.
  • 6 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 40 in. for SelecTTrac housings.

7 The 0.50 in. wall thickness housings are not approved with suspension capacities rated above 50,000 lbs.

The 0.63 in. wall thickness housings are not approved with suspension capacities rated above 52,000 lbs.

Page 60

Housing Dimensions
Drive Axle Model - Note 1 Housing Box Section (H x W x T) Spindle Diameters Spindle Not
(Nominal GAWR - 50,000 lbs.) Standard Track Wide Track (Inner/Outer) Туре NOL
D50-172 5.24 x 4.61 x .63 5.24 x 4.61 x .63 3.750/3.250 R 2
Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)
Housing Box Section (in.)
(H x W x T) 		78.5 in. Maximum Track Width Wide Track Note
5.24 x 4.61 x .63 47,500 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 76 in. Maximum Track 82 in. Maximum Track Note
(H x W x T) (Standard Track Housing) (Wide Track Housing)
5.24 x 4.61 x .50 50,000 42,000 2,4

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.) 73 in. Track 78.5 in. Track Note
(H x W x T) (Standard Housing) (Wide Track Housing)
5.24 x 4.61 x .63 65,000 62,000 2,3
Housing Box Section (in.) 76 in. Track 82 in. Track Note
(H x W x T) (Standard w/Outset) (Wide w/Outset)
5.24 x 4.61 x .63 62,000 52,000 2,3,4

Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 35.88 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as LMS or LMSi) is required.

5 The 0.63 in. wall thickness housings are not approved with suspension capacities rated above 52,000 lbs.

Page 61

Housing Dimensions
Drive Axle Model - Note 1
(Nominal GAWR - 52,000 lbs.) 		Housing Box Se Spindle Diameters Spindle Not
Standard Track Wide Track (Inner/Outer) Туре NOT
D52-190P, D52-590P 5.91 x 5.31 x .63 5.91 x 5.31 x .63 3.750/3.250 R 2
Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)
Housing Box Section (in.) 78.5 in. Maximum Track Width 81.0 in. Maximum Track Width Note
(H x W x T) Wide Track Wide-Wide Track
5.91 x 5.31 x .63 52,000 48,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 76 in. Maximum Track 82 in. Maximum Track 85 in. Maximum Track Note
(H x W x T) (Standard Track Housing) (Wide Track Housing) (Wide-Wide Track Housing)
5.91 x 5.31 x .63 50,000 46,500 42,000 2,4

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.)
(H x W x T) 		73 in. Track
(Standard Housing) 		78.5 in. Track
(Wide Track Housing) 		81.0 in. Track
(Wide-Wide Track Housing) 		Note
5.91 x 5.31 x .63 66,000 63,000 56,000 2,3
Housing Box Section (in.)
(H x W x T) 		76 in. Track
(Standard w/Outset) 		82 in. Track
(Wide w/Outset) 		85 in. Track
(Wide-Wide w/Outset) 		Note
5.91 x 5.31 x .63 63,000 53,000 46,000 2,3,4
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 35.88 in. and a maximum track width of 73 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

  • 4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as LMS or LMSi) is required.
  • 5 The 0.63 in. wall thickness housings are not approved with suspension capacities rated above 52,000 lbs.
Page 62

Housing Dimensions
Drive Axle Model - Note 1 Housing Box Se Spindle Diameters Spindle Not
(Nominal GAWR - 60,000 lbs.) Standard Track Wide/Wide-Wide Track (Inner/Outer) Туре
D60-190P, D60-590P 5.91 x 5.31 x .63 5.91 x 5.31 x .63 4.125/3.500 W 2

Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)

Housing Box Section (in.) 74.1 in. Maximum Track Width 76 in. Maximum Track Width Note
(H x W x T) Wide Track Wide-Wide Track
5.91 x 5.31 x .63 60,000 58,000 2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.) 76 in. Maximum Track 78 in. Maximum Track 80 in. Maximum Track Note
(H x W x T) (Standard Track Housing) (Wide Track Housing) (Wide-Wide Track Housing)
5.91 x 5.31 x .63 57,500 53,000 49,500 2,4

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.) 72.5 in. Track 74.1 in. Track 76 in. Track Note
(H x W x T) (Standard Track Housing) (Wide Track Housing) (Wide-Wide Track Housing)
5.91 x 5.31 x .63 70,000 68,000 66,000 2,3
Housing Box Section (in.) 76 in. Track 78 in. Track 80 in. Track Note
(H x W x T) (Standard w/Outset) (Wide w/Outset) (Wide-Wide w/Outset)
5.91 x 5.31 x .63 66,000 64,000 62,000 2,3,4
Note

1 Nominal gross axle weight rating (GAWR) is based on minimum axle mounting centers of 35.88 in. and a maximum track width of 72.5 in.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.

5 The 0.63" wall thickness housings are not approved with suspension capacities rated above 65,000 lbs.

Page 63

Tridem Load Ratings

Housing Dimensions
Drive Axle Medel Note 1 Housing Box Section (in.) (H x W x T) Spindle Diameters Spindle Not
Drive Axie Model - Note 1 Standard Track Wide Track (Inner/Outer) Туре
T69-172HP 5.24 x 4.61 x .63 5.24 x 4.61 x .63 2 750/2 250 р 1
T78-190P, T78-590P 5.91 x 5.31 x .63 5.91 x 5.31 x .63 3.750/3.250 n n 1

Gross Axle Ratings Based on the Use of Wide Track Housings (lbs.)

Housing Box Section (in.)
(H x W x T) 		78.5 in. Maximum Track Width
Wide Track 		Note
5.24 x 4.61 x .63 Note 1 1,2
5.91 x 5.31 x .63 1,2

Gross Axle Ratings Based on the Use of Single Outset Wheels (lbs.)

Housing Box Section (in.)
(H x W x T) 		76 in. Maximum Track
(Standard Track Housing) 		82 in. Maximum Track
(Wide Track Housing) 		Note
5.24 x 4.61 x .63 Net - 1 1,2,4
5.91 x 5.31 x .63 1,2,4

Gross Axle Ratings Based on Site Travel Conditions Only (lbs.) - Note 3

Housing Box Section (in.) 73 in. Track 78.5 in. Track Note
(H x W x T) (Standard Housing) (Wide Track Housing)
5.24 x 4.61 x .63 72,000 69,000 2,3
5.91 x 5.31 x .63 78,000 78,000 2,3
Housing Box Section (in.) 76 in. Maximum Track 82 in. Maximum Track Note
(H x W x T) (Standard w/Outset) (Wide w/Outset)
Housing Box Section (in.) 76 in. Maximum Track 82 in. Maximum Track Note
(H x W x T) (Standard w/Outset) (Wide w/Outset)
5.24 x 4.61 x .63 69,000 63,000

Note

1 Maximum allowable gross axle weight ratings (GAWR) vary with ratio and track width.

2 Track widths are nominal and may vary with wheel equipment.

3 Site travel: 5 miles per hour maximum speed with liftable axles raised. This condition shall not exceed 5% of the total operating miles of the vehicle.

4 Single tires with outset wheels beyond 2.0 in. are not approved. For all drive axles with single tires and outset wheels, a pre-set hub system (such as Dana LMS or LMSi) is required.

5 The .0.63" wall thickness housings are not approved with suspension capacities rated above nominal axle rating.

Page 64

GAWR Rating 78.5 in.
Wide Track 		76 in. Track 82 in. Track
Ratio Standard
Housing 		Wide Track
Housing 		Single Tires
Standard
Housing 		Single Tires
Wide Track
Housing
3.42 51,000 51,000 51,000 51,000
م خ 3.58 53,000 53,000 53,000 53,000
72H
0.8 		3.73 55,000 55,000 55,000 55,000
-11 3.91 58,000 58,000 58,000 58,000
- В 4.10 61,000 61,000 61,000 61,000
na
s SL 		4.30 64,000 64,000 64,000 63,000
Tire 4.56 68,000 68,000 68,000 63,000
4.78 69,000 69,000 69,000 63,000
5.25 69,000 69,000 69,000 63,000
5.38 69,000 69,000 69,000 63,000
5.57 69,000 69,000 69,000 63,000
6.14 69,000 69,000 69,000 63,000
6.83 69,000 69,000 69,000 63,000
7.17 69,000 69,000 69,000 63,000

Tridem Load Ratings (continued)

Ra itio GAWR Rating 78.5 in.
Wide Track 		76 in. Track 82 in. Track
190P 590P Standard
Housing 		Wide Track
Housing 		Single Tires
Standard
Housing 		Single Tires
Wide Track
Housing
РО 3.42 4.75 60,000 60,000 60,000 60,000
-59
in. 		3.58 4.99 60,000 60,000 60,000 60,000
Т78
).8 		3.73 5.19 60,000 60,000 60,000 60,000
, 20 3.91 5.44 60,000 60,000 60,000 60,000
190
190 		4.10 5.70 61,000 61,000 61,000 61,000
78-
SI 		4.30 5.98 64,000 64,000 64,000 64,000
a T
Tire 		4.56 6.34 68,000 68,000 68,000 68,000
Jan 4.78 6.65 71,000 71,000 71,000 69,000
5.25 7.30 78,000 78,000 75,000 69,000
5.38 7.48 78,000 78,000 75,000 69,000
5.57 7.75 78,000 78,000 75,000 69,000
6.14 8.55 78,000 78,000 75,000 69,000
6.83 9.51 77,000 77,000 75,000 69,000
7.17 9.97 71,000 71,000 71,000 69,000
Page 65

Spicer® Drive Axle Model Identification

Note: All options are not available for each model.

Design Level

Series

Page 66

Spicer® Drive Axle Model Identification (continued)

Note: All options are not available for each model.

* Requires protective shift system

Page 67

Spicer® Drive Axle Identification

Drive Axle Head Assembly

  • 1 Country of origin
  • 2 Axle model identification
  • 3 Specification number assigned to the axle built by Dana. Identifies all component parts of the axle including special OEM requirements such as yokes or flanges.
  • 4 OEM part number assigned to the axle build
  • 5 Carrier assembly serial number assigned by the manufacturing plant
  • 6 Axle gear ratio
  • 7 Carrier assembly production or service part number

2 - Axle shaft part number

Page 68

Spicer® Drive Axle Identification (continued)

Parts Identification

Ring Gear and Pinion

Note: Ring gear and drive pinion are matched parts and must be replaced in sets.

  • 1 Part number
  • 5 Number of pinion teeth
  • 2 Number of ring gear teeth
  • 3 Manufacturing numbers
  • 4 Matching gear set numbers
  • 6 Date code
  • 7 Indicates genuine Spicer® parts
  • 8 Heat code
Page 69

Tandem Axle Assembly

Page 70

Housing and Output Shaft Assembly

  • 1 Output shaft nut
  • 2 Output yoke
  • 3 Output seal
  • 4 Output shaft bearing snap ring
  • 5 Outer bearing cup
  • 6 Outer bearing cone
  • 7 Inner bearing cone
  • 8 Inner bearing cup
  • 9 Output shaft

  • 10 Rear cover
  • 11 Rear cover capscrew
  • 12 Fill plug
  • 13 Rear cover nut
  • 14 Washer
  • 15 Stud
  • 16 Spindle nut outer*
  • 17 Locking ring*
  • 18 Spindle nut inner*

  • 19 Axle housing
  • 20 Breather
  • 21 Breather hose
  • 22 Carrier capscrew
  • 23 Nut
  • 24 Washer
  • 25 Stud
  • 26 Drain plug
  • 27 Axle shaft
Page 71

Forward Axle Pinion Assembly (Tandem Axle)

Page 72

Wheel Differential

  • 1 Threaded bearing adjuster (flange half)
    • llf) 6
  • 2 Bearing cone (flange half)
  • 3 Differential case (flange half)
  • 4 Ring gear

  • 5 Ring gear bolt
  • 6 Side gear
  • 7 Side pinion
  • 8 Differential spider
  • 9 Differential case (plain half)
  • 10 Differential case (plain half) wheel differential lock
  • 11 Bearing cone (plain half)
  • 12 Threaded bearing adjuster (plain half)
Page 73

Power Divider

  • 1 Output shaft nut
  • 2 Output yoke
  • 3 Output seal
  • 4 Output shaft bearing snap ring
  • 5 Outer bearing cup
  • 6 Outer bearing cone
  • 7 Inner bearing cone
  • 8 Inner bearing cup
  • 9 Output shaft
  • 10 Seal manifold
  • 11 Clamp
  • 12 Seal manifold feed tube
  • 13 Sump screen
  • 14 Output side gear bearing cup

  • 15 Output side gear bearing cone
  • 16 Pin
  • 17 Output side gear
  • 18 Pump
  • 19 Interaxle differential
  • 20 Helical side gear
  • 21 Thrust washer
  • 22 Lockout sliding clutch
  • 23 Shift fork spring
  • 24 Shift fork assembly
  • 25 V-ring
  • 26 Input shaft
  • 27 Input shaft bearing cone
  • 28 Carrier housing

  • 29 Locking capscrew
  • 30 Input cover
  • 31 Input cover capscrew
  • 32 Bearing cup and cage
  • 33 Input seal
  • 34 Input yoke
  • 35 Input nut
  • 36 Piston
  • 37 0-ring
  • 38 Piston cover
  • 39 Pinion cover
  • 40 Input cover capscrew
  • 41 Input cover
  • 42 Carrier housing
Page 74

Spindle Nut Systems

Three-piece Dowel-type Lock Washer System

Three-piece Tang-type Lock Washer System

Four-piece Tang/Dowel-type Lock Washer System

Page 75

Axle Shaft Flange to Hub

With straight holes in axle shaft flange

Page 76

Power Flow and Torque Distribution

In operation, the power divider accepts torque from the vehicle driveline and distributes it equally to the two axles.

This assembly is of the two-gear design consisting of an input shaft, interaxle differential, output shaft, and two constant-mesh helical gears.

The interaxle differential compensates for minor variations in speed between the two axles, the same way the wheel differential works between the two wheels of a single drive axle. This unit also acts as a central point in distribution of torgue to the two axles.

The power divider also includes a driver-controlled, air-operated lockout. When lockout is engaged, it mechanically prevents interaxle differentiation for better performance under poor traction conditions.

  • 1 Input torque
  • 2 Lockout disengaged
  • 3 Forward axle torque is transmitted from the helical side gear through the pinion helical gear, drive pinion, ring gear, wheel differential, and axle shafts.
  • 4 Rear axle torque is transmitted from the output shaft side gear through the output shaft, interaxle driveline, drive pinion, ring gear, wheel differential, and axle shafts.
  • 5 Input torque (power flow) from the vehicle driveline is transmitted to the input shaft and the interaxle differential spider. The differential distributes torque equally to both axles.
Page 77

Power Flow and Torque Distribution

With Lockout Engaged (Interaxle Differential Is Not Operating)

Lockout should only be engaged when both axles are rotating at the same speed. Operation should be limited to lowtraction situations and should be disengaged when normal traction returns. Failure to do so will result in poor handling and damage to the axle components.

Note: Varied road surface conditions can result in unequal torque distribution between the two axle assemblies.

CAUTION: Prolonged operation with the lockout engaged can damage axle and driveline components.

  • 1 Input torque
  • 2 Lockout engaged
  • 3 Forward axle torque is transmitted from the helical side gear through the pinion helical gear, drive pinion, ring gear, wheel differential, and axle shafts.
  • 4 Rear axle torque is transmitted from the output shaft side gear through the output shaft, interaxle driveline, drive pinion, ring gear, wheel differential, and axle shafts.
  • 5 Input torque (power flow) from the vehicle driveline is transmitted directly to the helical side gear and the output shaft. A positive drive is provided to both axles for maximum traction under adverse road conditions.
Page 78

Wheel Differential Lock

The Spicer® wheel differential lock is an optional feature for Spicer axles. In operation, it positively locks the wheel differential to provide improved traction under adverse road conditions.

The differential lock is driver-controlled through an electric switch or air valve mounted in the cab. The locking mechanism is air-operated to engage a mechanical clutch and lock the wheel differential. It is spring-operated to disengage the lock and permit the wheel differential to function normally.

The wheel differential lock consists of three major assemblies.

  • Shift Cylinder Assembly: Operates a shift fork and push rod assembly.
  • Shift Fork and Push Rod Assembly: Engages and disengages the differential lock curvic clutch assembly.
  • Curvic Clutch Assembly: Consists of a sliding clutch splined to an axle shaft and a fixed clutch which is splined to the differential case hub.

The differential lock also includes a selector switch (electric) which senses clutch engagement and sends an electrical signal to a cabmounted indicator light (or an audible signal device).

Page 79

Differential Lock Engaged

Air pressure applied to the shift cylinder moves the piston, push rod, and shift fork, and the sliding curvic clutch engages the fixed curvic clutch.

The sliding clutch is splined to the axle shaft. The fixed clutch is splined to the differential case hub. Engaging the two clutches locks the wheel differential, preventing wheel differential action.

Differential Lock Engaged

  • 1 Spring is compressed
  • 2 Shift fork
  • 3 Piston and rod
  • 4 Selector switch
  • 5 Air pressure applied engages clutches
  • 6 Fixed clutch splined to differential case
  • 7 Sliding clutch splined to axle shaft and engaged with fixed clutch

Differential Lock Disengaged

When air pressure at the shift cylinder is released, a compression spring (mounted on the push rod) moves the push rod, shift fork, and sliding clutch as an assembly. The sliding clutch moves out of engagement with the fixed clutch. The wheel differential is unlocked and operates normally.

Differential Lock Disengaged

  • 1 Spring is decompressed
  • 2 Shift fork
  • 3 Piston and rod
  • 4 Selector switch
  • 5 Air pressure released disengages clutches
  • 6 Fixed clutch splined to differential case
  • 7 Sliding clutch splined to axle shaft

Differential Lock Engagement Indicator

Differential lock engagement is detected by a switch (electric) mounted on the differential carrier. An actuator, mounted in the piston cover, operates the switch.

When the shift fork moves to engage the differential lock, the push rod actuator moves away from the switch, allows the switch to close, and sends an electrical signal to turn on a cab-mounted indicator light (or an audible signal).

When the shift fork moves to disengage the differential lock, the compression spring also moves the push rod actuator to contact the switch. The switch is opened and turns off the cab-mounted indicator light (or the audible signal).

Page 80

General Lubrication Information

The ability of a drive axle to deliver quiet, trouble-free operation over a period of years is largely dependent upon the use of good quality gear lubrication in the correct quantity. The most satisfactory results can be obtained by following the directions contained in this manual.

The following lubrication instructions represent the most current recommendations from Dana.

Approved Lubricants

General —Petroleum-based and synthetic-based lubricants approved under SAE J2360 are required for Dana axles. The current qualified products list may be found by searching "SAE J2360 QPL" and choosing "PRI Automotive Lubricant Review," followed by "Current QPL." Please consult with the lubricant supplier to ensure the product chosen matches the products described in the list.

Extended drain interval lubricants are available for Dana axles. These lubricants are approved under Dana specification SHAES256, Rev. E and SHAES429. See Dana Lubrication Manual LM072012 for additional information.

Spicer® synthetic gear lubricants are available in various SAE weights.

Note: The use of separate oil additives and/or friction modifiers are not approved for use in Spicer drive axles.

Synthetic-based —Synthetic-based gear lubricants exhibit superior thermal and oxidation stability, and generally degrade at a lower rate when compared to petroleum-based lubricants. The performance characteristics of these lubricants include extended change intervals, improved fuel economy, better extreme temperature operation, reduced wear and cleaner component appearance.

The family of Spicer gear lubricants represents a premium quality synthetic lube which fully meets or exceeds the requirements of SAE J2360. The products, available in various SAE weights, have demonstrated superior performance in comparison to others qualified under the SAE J2360, as demonstrated by extensive laboratory and field testing. For a complete list of Spicer approved synthetic lubricants, contact your local Dana representative.

See back cover of this manual for appropriate phone number.

Makeup Lube —Maximum amount of non-synthetic makeup lube is 10%.

Recommendations for Viscosity/ Ambient Temperature

The following chart lists the various SAE Grades covered by SAE J2360 and the associated ambient temperature range from each. Those SAE grades shown with an asterisk (*) are available in the Spicer family of synthetic gear lubricants.

The lowest ambient temperatures covered by this chart are -40°F and -40°C. Lubrication recommendations for those applications which consistently operate below this temperature range, must be obtained through Dana by contacting your local Dana Spicer representative.

Grade Grade Ambient Temperature Range
75W -40°F to -15°F (-40°C to -26°C)
75W-80 -40°F to 80°F (-40°C to 21°C)
75W-85* -40°F to 90°F (-40°C to 32°C)
75W-90* -40°F to 100°F (-40°C to 38°C)
75W-140 -40°F and above (-40°C and above)
80W-90 -15°F to 100°F (-26°C to 38°C)
80W-140* -15°F and above (-26°C and above)
85W-140 10°F and above (-12°C and above)

* Available in the Spicer family of synthetic gear lubricants

Page 81

Lube Change Intervals

This product combines the latest manufacturing and part washing technology. When filled with a Spicer approved synthetic lubricant at the factory, the initial drain is not required.

Change the lubricant within the first 5,000 miles of operation when not using a Spicer approved synthetic lubricant in either a new axle or after a carrier head replacement.

Base subsequent lubricant changes on a combination of the following chart and user assessment of the application and operating environment.

Severe Service Lubrication Change Intervals

Severe service applications are those where the vehicle consistently operates at or near its maximum GCW or GVW ratings, dusty or wet environments, or consistent operation on grades greater than 8%. For these applications, the ON/OFF HIGHWAY portion of the chart should be used. Typical applications are construction, logging, mining and refuse removal.

Note: Clean metallic particles from the magnetic filler plug and drain plugs. Clean or replace the breather yearly to avoid lube contamination due to water ingestion.

Synthetic or
Mineral 		Lubricant SAE Change Interval for Line Haul Change Interval for Vocational,
On/Off Highway
Synthetic SHAES-256, Rev E SAE 75W-90,
SAE 75W-85 		500,000 miles [800,000 Km] or 5 years 180,000 miles [288,000 Km] or 1 year
Synthetic SHAES-429 SAE 75W-140 250,000 miles [400,000 Km] or 3 years 180,000 miles [288,000 Km] or 1 year
Mineral Base SAE J2360 75W, 75W-85,
75W-90, 75W-140,
80W-90, 85W-140 		120,000 miles [193,000 Km] or 1 year 60,000 miles [96,500 Km] or 1 year
Page 82

Description and Operation

Two-speed, single or tandem, are dual range shiftable axles. They provide low and high range gearing and are designed for heavy-duty service in on-off highway operations. Low range for deep gear reduction and slow speed hauling off-highway. High range for cruising speeds on-highway.

The complete tandem axle assembly includes two axle units, each with double gear reduction capability coupled by a two-gear power divider.

Gearing and Torque Distribution - Dual Range Gearing

The gearing for each axle is a combination of a spiral bevel ring gear and pinion and a planetary unit. First reduction (High Range) is provided by the spiral bevel gearing. Second reduction (Low Range) is through the planetary gearing. Four planetary idler pinions are confined within the ring gear internal teeth. The planetary gears rotate around a sliding clutch gear.

Each axle is equipped with a shift unit, which operates the sliding clutch gear to provide a means for selecting the axle range. Range selection is accomplished through the movement of the sliding clutch gear in and out of engagement with low- and high-speed clutch plates.

Page 83

Description and Operation

The planetary double reduction axles share their basic design concepts and many components with the dual range tandem.

The principle variation is the permanent engagement of the double reduction feature. A stationary sun gear, fixed in

engagement with the low-speed clutch plate, replaces the sliding clutch gear and provides continuous double reduction operation in the same manner as the dual range axle when in Low Range.

Planetary Double Reduction Gearing

Page 84

Dual/Single Tire

TRACK – The distance between the dual tire centerlines or the distance between the tire centerlines on a single tire.

SLR (Static Loaded Radius) – The distance from the centerline of the axle to the ground, underrated tire capacity, with the tire at rest.

SMC (Suspension Mounting Centers) – The distance between suspension mounting points on an axle.

Page 85

Offset Wheels

  • Outset (positive) The tire centerline is positioned outboard of the wheel mounting face.
  • Inset (negative) The tire centerline is positioned inboard of the wheel mounting face.

Super Singles or Wide-Based Tires – Term associated with single tire drive axle arrangements typically used with outset or zero offset wheels (in place of dual tire arrangements).

Page 86

40,000 lb. Ratings

Page 87

40,000 lb. Ratings (continued)

Page 88

44,000 lb. Ratings

Page 89

46,000 lb. Ratings

Page 90

Terms

ABA (Automatic Brake Adjuster) - Also called an Automatic Slack Adjuster (ASA), this is a lever connecting the brake chamber push rod with the foundation brake camshaft. It provides torque to rotate the brake camshaft when the brake treadle is depressed. It also provides a means of automatically adjusting clearance between brake shoes and the drum to compensate for lining wear. Some brake adjusters require manual adjustment.

ABS (Anti-lock Brake System) - Electronically monitors wheel speed and prevents wheel lockup by rapidly cycling the brakes during panic stops and when stopping on low-friction surfaces.

ABS Control Valves - Control valves that are actuated by the ABS Electronic Control Unit (ECU) to ensure wheels are optimally braked. On a tractor, they are called ABS modulator valves. On a trailer, they're called ABS relay valves.

A/C Centers - The distance from the centerline of one brake chamber to the other.

Ackermann Geometry - The relative angular movements of the front wheels while traveling along a curved path. (A double pivoting steering system, where the outer tie rod arms are bent slightly inward so that when a vehicle is making a turn the wheels toe out and the inside wheel will turn more sharply than the outer wheel.) This is done to compensate for the greater distance the outside wheel must travel. These angular movements relate to the length of wheelbase and the width of track. True Ackermann geometry includes the Jeantaud modification to Budolph Ackermann's original principle

Active Suspension - While conventional suspension uses springs and shock absorbers to isolate the vehicle from the bouncing movement of the wheels when it contacts rough roads, active suspension uses power actuators that are controlled by a computer. These actuators place the wheels of the vehicle in the best position to accommodate rough roads as well as compensate for different load levels.

Actuate - To initiate mechanical motion of a brake system component.

Actuator - A device that physically initiates mechanical motion of a brake system component.

ADB - See "Air Disc Brakes."

ADR 35 (Australian Design Rule 35) - Specifies braking requirements under normal and emergency conditions.

Aftercooler - Optional device that condenses and eliminates water from air pressurized by the compressor.

Air Build-Up - Process of compressor building pressure to a predetermined maximum level, usually 100-120 psi, within the brake system air tanks.

Return to Table of Contents

Air Compressor - Engine-driven via a belt or direct gear, the compressor pressurizes the air tank.

Air Compressor Cut-Out - Predetermined point at which the air governor halts compression of air by the compressor.

Air Disc Brakes - Air-actuated brakes, which upon application, employ a caliper to clamp two brake pads against a rotor. Air discs, compared with drum-type brakes, have superior ability to resist fade.

Air Dryer - A filter, typically containing a desiccant, which is installed between the compressor and service reservoir to remove water and vapor plus oil blow-by from the compressor.

Air Gauge - Dash-mounted gauge indicating air pressure in terms of pounds per square inch (psi).

Air Governor - Controls the compressor unloader mechanism and also maintains system air pressure between predetermined minimum and maximum levels, usually between 90-120 psi.

Air Over/Under - In relation to suspensions.

Overslung - Suspension arm goes above or over the axle air bag.

Underslung - Suspension arm goes below or under the axle air bag.

Air System Balance - Can be separated into two different aspects: pressure level balance and timing balance. Air system balance deals primarily with the vehicle air system components that directly control the actuation of the service brakes during normal stops, foot control valve, check valves, relay valves and their arrangement or system design. Their purpose is to balance the time it takes air pressure to build uniformly at all wheel ends.

Air Tank - A reservoir for compressed air. Typically, a combination vehicle has several tanks: three in the tractor and one per trailer. The tractor's supply air tank (formerly "wet tank") receives air from the compressor and delivers it to the primary and secondary air tanks in the tractor. A check valve on each tank prevents total air loss in the event of a leak.

Alcohol Evaporator - Optional device, installed in compressor discharge line between the compressor and supply air tank, which injects alcohol mist into the air flow to reduce the risk of freeze up. It's not normally used in a vehicle with an air dryer.

AL Factor - A mathematical expression of the brake adjuster and brake chamber combination. "A" equals the effective area, in square inches, of the brake chamber (e.g., Type 30 chamber has effective area of 30 sq. in.). "L" equals the effective length, in inches, of the slack adjuster. For example, 30 x 6 in. = 180.

Alignment - Method of maintaining proper relationship between all components of the steering system.

Page 91

Amboid Gear - Modified Spiral Bevel Gear that allows the pinion to be positioned above the ring centerline.

Analog Processing - A method of processing information used in older ABS control units. Today's Electronic Control Units (ECUs) use digital processing, which is many times faster and more reliable.

Anchor Pin - A pin or pins used to retain brake shoes within the brake assembly.

Anti-Compounding - A system that prevents application of service brakes from compounding the force exerted by parking brakes. This guards against damage to brake components due to excessive loads.

Anti-lock Brake System - See "ABS."

Application Time - Time elapsed between depression of the brake treadle and engagement of the linings with the drums (or, per FMVSS 121, the point at which all service chambers reach 60 psi).

Application Valve - Air valve, such as foot valve or trailer control valve, which controls the pressure delivered to the brake chambers.

ASR (Anti-Spin Regulation) - See "ATC."

ATC (Automatic Traction Control) - Also called ASR, it's an optional system that is available on 4- and 6-channel ABS systems. Automatic traction control minimizes wheel slipping during acceleration by controlling both the engine throttle and brake pressures.

Automatic Brake Adjuster - See "ABA."

Automatic Traction Control - See "ATC."

Auxiliary Lift Axle - An extra axle often kept in a lifted position and only dropped to the pavement when its extra load-carrying capacity is needed.

Auxiliary Retarder - See "Retarder."

Auxiliary Transmission - Additional gear box increasing the gear ratio combinations when used with main transmission or multispeed axles.

Axle Carrier Assembly - Portion of the axle assembly that contains the drive gears and differential. To complete the axle assembly, the carrier assembly is combined with the housing.

Axle, Live - Driven Axle.

Axle Mounting Centers - Also referred to as the "Suspension Mounting Centers." This is the distance between centerlines of where the suspension clamps to the axle.

Axle Shaft - Transmits torque from the wheel differential to the wheel equipment.

Axle Shaft Floating - Shaft carries no vehicle loads, but transmits torque.

Axle Shaft Semi-Floating - Shaft carries vehicle loads as well as torque.

Axle Shift System - The actual control mechanism that is employed to control movement of a shift fork or sliding clutch to vary the axle ratio. Three general types are employed for this purpose:

1. Air shift system

2. Electric over air shift system

3. Electric shift system

Axle Spindle - Used on a full floating housing design, supports the wheel end system.

BCCC Dimension - Distance from the Brake Shoe centerline to the Brake Chamber centerline.

Beam Drop - Distance from the kingpin to spindle intersection to the spring-mounting pad surface.

Bearing Shoulder to Bearing Shoulder Dimension - Distance from the machined inner bearing contact point on one side of the axle to the machined inner bearing contact point on the other side.

Belleville Washer - Also known as coned-disc springs or Belleville disc springs. They provide very high loads at small deflection and also maintain a constant force regardless of dimensional variations due to wear, temperature changes or tolerances.

Bell-Mouthed Drum - Drum with variation of inner diameter (i.e., greater at open end), preventing full contact with brake lining.

Blue Drum - Brake drum with friction surface turned blue from high temperature. High temperature may result from dragging of brakes caused by weak return springs. Blue drum also may result from lack of brake balance (i.e., excessive brake torque at wheel with blue drum and lack of brake torque and other wheel ends).

Bogie - Combination of two axles usually pivoting about a common trunnion.

Brake Adjuster - See "Slack Adjuster."

Brake Balance - Balance is achieved when all brakes on all axles do their fair share of the work. The four types of brake balance are: pneumatic, thermal, timing, and torque.

Brake Block - Friction material, also known as brake lining, attached to a brake shoe. Disc brakes use pads with friction material.

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Brake Chamber - Device inside which a diaphragm converts air pressure to mechanical force, via a push rod, for brake actuation. Consists of service chamber or service chamber/ spring chamber. For example: A 30/36 chamber consists of a Type 30 service chamber and a Type 36 spring chamber. See "Service Brake" and "Spring Brake."

Brake Chamber Diaphragm - Compression molded device within a brake chamber that converts air pressure to mechanical force via a push rod. The size of the brake chamber correlates with the effective area of the diaphragm. A Type 30 chamber diaphragm has an effective area of 30 sq. in.

Brake Drag - Failure of one or more brakes to release immediately and/or completely after a driver removes his foot from the brake treadle. Constant drag, unrelated to a brake application, also can exist. See "Quick-Release Valve."

Brake Drum - Attached to the hub. Converts kinetic energy from the shoe and lining assembly to heat and transfers that heat away from the brake surface to dissipate into the atmosphere over time. The majority of drums are entirely of cast iron. Generally these are divided into three service-rating codes based on application. There is standard duty, heavy duty, and extra heavy duty. In addition, there are inboard mounted drums (with spoke wheels) and outboard mounted drums (with hubs). The other brake drum is the steel jacketed type. This consists of a steel mounting face with a cast iron braking surface insert.

Brake, Engine - See "Engine Brake."

Brake, Exhaust - See "Exhaust Brake."

Brake Fade - There are many types and causes of braking fade. Fade may result, for example, from a reduction in friction between linings and drums caused by exposure to water. Most typically, however, fade involves a reduction in braking force experienced when dragging brakes on a long grade. If brakes are maladjusted, an overheated drum may expand to the degree that push rod travel is insufficient to fully actuate the brakes. This is one example of mechanical fade, which also may result from various mechanical defects (e.g., scored drums) within the foundation brake . In contrast, heat fade occurs when linings overheat and become less aggressive. Gradual and predictable fade is desirable as a warning.

Brake Proportioning - Optional safety-oriented system, often called "bobtail proportioning," for limiting drive axle brakes while a tractor is operated without a trailer. Also, system that varies individual axle braking effort in response to weight or other variable.

Brake Treadle - Functionally, the brake pedal - a mechanical lever attached to the foot brake valve.

Breakaway Valve - Upon accidental separation of trailer(s), a tractor protection system that prevents air loss from the power unit. See "Tractor Protection Valve."

Breather - A vent in the drive axle housing for relieving internal pressure due to heating and cooling within the housing.

Bridge Formula - See "Federal Bridge Formula."

Broached Bushing - Bushing that is finished by a round cutting tool that has multiple teeth each removing a small portion of the bushing material to achieve desired finished size.

B/S-B/S - See "Bearing Shoulder to Bearing Shoulder Dimension."

Burnish - The conditioning or "seasoning" of a brake lining by wear and temperature via a test procedure or in-service operation.

Caliper - In an air disc brake system, the clamping device containing friction material mounted to pads. When actuated, the caliper applies braking force to both sides of the rotor.

Camber - The tilt of the wheel side-to-side while looking from the front - places the road contact points closer to the king pin axis, thereby reducing road inputs to the steering system and contributes to steering stability. Camber, Negative - Top of the wheel tilts inward.

Camber, Positive - Top of the wheel tilts outward.

Cam Roll-Over - Jargon denoting that an S-cam has traveled beyond its designed stopping position during brake application. The wheel end must be removed to repair cam roll over. It is caused by a combination of excessively worn lining and drum.

Cam Same/Opposite Drum Rotation - As can be seen in this force vector comparison, the direction of the application force is different between cam same and cam opposite. In the cam same, the cam rotation is in the same direction as drum rotation. In the cam opposite, the primary shoe roller is pushed out and up, which tends to allow the cam end of the shoe to be pushed against the drum instead of the center of the shoe. This allows the shoe to energize itself and increases torque output (slightly) over a cam same brake. Also in some cases with certain combinations of hardware and lining materials, cam opposite brakes are noisy. Of course the question comes to mind "why have a cam opposite brake if it is a disadvantage?" The answer is that some suspension systems do not have enough clearance to allow chamber brackets to be mounted in the proper location to allow cam same brakes.

Cam UH Length - On DAP trailer axles, the length as measured from under the brake cam head to the end of the drum.

Cardan Universal Joint - A non-constant universal joint consisting of two vokes joined by a cross.

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Carrier - Portion of the axle assembly that contains the drive gears and differential.

Caster - Tilt of the kingpin centerline looking from the side offers directional stability and assists in returning wheels to a straightahead position through self-centering action.

Caster, Negative - Kingpin centerline projected behind the road contact point.

Caster, Positive - Kingpin centerline projected ahead of the road contact point.

Central Tire Inflation System - See "CTIS."

Channel, ABS - The number of channels in an ABS system refers to the number of valves its Electronic Control Unit (ECU) is capable of independently controlling.

1-Channel ABS - A system design that uses two-wheel speed sensors and one control valve (2S/1M). This is the most popular system for most trailers. It is called tandem control.

2-Channel ABS - A system design that uses two- or four-wheel speed sensors and two control valves (2S/2M or 4S/2M). The ABS monitors wheel speed and avoids wheel lockup on one axle while braking on low-friction surfaces or in emergency situations by rapidly cycling the brakes on the wheel ends of two axles. Commonly used on trailers.

4-Channel ABS - A system design that uses four-wheel speed sensors and four ABS control valves (4S/4M) on a two-axle truck or tractor. A 4-channel system can also be used on a three-axle vehicle, controlling the left and right side drive axle wheels in pairs. This popular system, which offers an optimum blend of performance and economy, is the most common system on trucks, tractors and buses.

6-Channel ABS - A system design that features six-wheel speed sensors and six ABS control valves (6S/6M) to individually monitor and control all six wheels of a three-axle truck or tractor. This type of system provides the highest available level of ABS control. It's commonly used on vehicles with lift or tag axles.

Check Valve - A one-way check valve is used, for example, to prevent air from bleeding back out of a reservoir. A two-way check valve activates selectively, for instance, by drawing air for brake application from the most highly pressurized reservoir (primary or secondary).

Clearance Sensing Brake Adjuster - Senses force when brake lining contacts the drum to adjust lining to drum clearance.

Clevis Pin - Pin connecting the arm of a slack adjuster to a brake chamber push rod yoke. CMVSS 121 (Canadian Motor Vehicle Safety Standard 121) - Standard for air brake vehicles.

Combination - Truck coupled to one or more trailers.

Combination Lining Block - Two different lining materials on the same brake shoe. The higher friction material is on the cam end of the brake shoe with the lower friction material on the anchor end.

Companion Flange - Drive shaft side of the joint that connects the drive shaft to the drive axle.

Compressible Inserts - Foam inserts installed in the top and bottom of the kingpin under the cap that reduce the pressure / vacuum that is found in the bushing area during typical service.

Connectors, ABS - Sealed, corrosion-resistant plugs that link the ABS wiring system to the Electronic Control Unit (ECU), wheel speed sensors and modulator or relay valves using a shielded wiring harness.

Control Algorithm - The computer commands programmed into the Electronic Control Unit (ECU) to control brake actuation under impending wheel lockup.

Controlled Traction Differential - A differential assembly that incorporates a friction plate assembly whose purpose is to transfer torque from the slipping wheel to the one with traction. This assembly consists of a multiple-disc clutch that is designed to slip when a predetermined torque value is reached.

Cracked Drum - Brake drum cracked all the way through by excessive heat build-up (perhaps signifying inadequate drum weight, and/or driver abuse and/or resurfacing of a drum beyond the manufacturer's limit). It could also be caused by poor brake balance. (See "Brake Balance.")

Crack Pressure - Minimum air pressure, expressed in pounds per square inch (psi), required to open an air valve.

Cramp Angle - Maximum turn of steering wheel in either direction.

Creep Rating - Extremely slow operation (<1.0 mi/hr) typically applying to crane service.

Cross Link - Composed of the adjustable cross tube and threaded tie rod ends with ball sockets that connect the LH knuckle tie rod arm to the RH knuckle tie rod arm.

Cross Tube - Center tube portion of a cross link assembly that is threaded with opposite threads on each end, thereby allowing adjustment by turning the tube with one hand.

CTIS (Central Tire Inflation System) - A means of easily adjusting the vehicle tire pressure, both inflate and deflate, for the conditions encountered whereby improving vehicle mobility performance. CTIS is synonymous with military off-road applications.

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DAP (Double Anchor Pin) - Brake system using two pivot pins as opposed to just one for anchoring the brake shoes.

Diagnostics, ABS - A component-by-component selfcheck performed each time the truck's ignition is turned on. An independent microprocessor also checks the system continuously during vehicle operation.

Diagonal System, ABS - A brake system design that divides the ABS into two circuits (front wheel on one side with rear on the other side, and vice versa) to allow partial system function should one diagonal malfunction.

Differential - Rear axle gear assembly permitting one axle shaft and wheel to turn more slowly or faster than the other when negotiating a turn.

Differential Lock - A mechanism that eliminates the action of the differential so that both wheels can be driven to improve tractive efforts on slippery surfaces. See "Driver-Controlled Wheel Differential Lock.

" Digital Processing, ABS - The latest processing technology that is many times faster and more reliable than analog processing.

Disc Brake - A foundation brake system consisting of a flat disc or rotor on either side, which are friction pads. Equal and opposite forces are applied to these pads to press their working surfaces into contact with the braking path of the rotor.

Dolly - Two-wheel trailer equipped with drawbar and the lower portion of a fifth wheel and other components necessary to permit a semi-trailer and dolly combination to operate a full trailer; sometimes called a "pup."

Double Anchor Pin - See "DAP."

Double Diaphragm Air Chamber - Generates force output by utilizing two separate diaphragms, one in the service chamber and the other inside the spring chamber. Double diaphragm brake chambers are the most common in North America for general truck/tractor and trailer applications. (See "Spring Brake.")

Double Drop - Beam having a drop in the center between the spring mounting pads, as well as the drop from the KPI to the spring mounting pads.

Double Reduction - Dual gear reduction generally used in rear axles.

Draglink - Connection between the pitman arm and the steer ball on the steer arm. Acts as a pull-and-push rod to convey steering movements from the chassis-mounted steering box to the springmounted axle.

Drain Valve - Used to drain oil and water from air reservoirs. Valve may be manual or automatic in operation. Automatic versions, which may be heated electrically to prevent the valve from freezing open, often are referred to as spitter valves.

Draw Key - Fastener in the steer axle that works like a wedge and provides a mechanism to lock the beam to the kingpin while allowing rotation of the knuckle on the kingpin.

Driver-Controlled Wheel Differential Lock - Driver-controlled traction device that can be operated from the vehicle cab by a switch. During periods of good traction, the differential lock should not be engaged. When locked, power transfer will be through the locked differential casing, gearing, and axle halfshafts together. This provides maximum traction to both sides, prevents "spinout," and protects against gearing damage.

Driving Axles, Steerable - Heavy-duty on- and off-road vehicles of 4x4 or 6x6 wheel configuration often require traction and maneuverability that can only be obtained with a steerable front drive axle.

Drop-In Unit - Generally refers to rear axle gear assembly located in axle housing by drop-in.

Drop Socket - Socket with the ball center not coincident with the threaded end.

Drum Brake - A brake system in which two brake shoes with friction material expand into a rotating drum.

Dry Park Maneuver - Turning steering wheel/tires without any forward or reverse movement.

Dual Drive Axle - See "Tandem Drive Axle."

Dual Brake System - A redundant air system (primary and secondary) designed to retain braking ability in the event one system fails.

Dual Draw Key - Arrangement of two draw keys used to balance load on kingpin to maintain alignment of kingpin to knuckle beam bore. (See "Draw Key.")

Dual Range - Two-speed, shiftable drive axles that provide two gearing ratios: a low range for slow speed hauling off-highway and a high range for cruising speeds on-highway.

Dump Body - A large truck's metal body that is generally hinged at the rear and dumped by hydraulic means. The size is generally given in cubic vard water level capacity.

Duplex Gauge - Essentially, a diagnostic device incorporating two separate air gauges with a common housing and utilizing indicator needles of different colors. Device is used to diagnose brake system imbalance within a combination vehicle via simultaneous connection to two points (such as the tractor glad-hand and a trailer brake chamber). It's also used as a dash gauge for dual reservoirs.

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Dust Shield - Plate made of metal or polyethylene that is mounted behind a brake drum to minimize entry of dirt and road splash.

Duty Cycle - Measurement of the amount of time a component is fully utilized, expressed as a percentage of the complete usage of the component. Duty Cycle "Class Definitions"

AA Turnpike or Interstate - Operation on limited access, wellmaintained, multi-lane highways of excellent concrete or asphalt with maximum adverse grades not in excess of 3 percent.

A On-Highway - Exclusive of operation on well-maintained major highways of excellent concrete or asphalt construction. Terrain may be level to rolling with occasional maximum adverse grades to 8 percent. Operations are subject to legal weight and dimensional limitations.

B On-/Off-Highway or Mountainous Highway - Secondary roads of good concrete or asphalt where intermittent grades of up to 12 percent adverse may be encountered or where up to 20 percent of the total operating time is spent on well maintained, off-highway roadways of crushed rock or similar material. Grades in this class are more frequent and severe than in Class A operation. Operation is subject to legal weight and dimensional limitations.

C Off-Highway - Operation exceeding 20 percent of the time on roads of gravel or maintained crushed rock surface where the maximum grade is 12 percent and frequent grades of 8 percent can be encountered. This operation is not generally subject to legal weight or dimensional limitations.

D Off-Road - Exclusively off-highway on private roadways with partial operation off-road in areas with no maintained hard surface. Grades and surface conditions may be variable. Operation is not subject to legal weight or dimensional limitations.

EBS - The abbreviation for Electronic Braking System, or brakeby- wire. A system in which the control signal is sent electronically, rather than pneumatically, although the actual service application is still made by air pressure.

ECE 13 - Uniform provisions concerning the approval of vehicles with regard to braking in Europe.

ECU, ABS - The abbreviation for Electric Control Unit, is a microprocessor that evaluates how fast a wheel is rotating. The electrical signals generated by the inductive sensors pick up impulses from toothed rings that spin with the wheel. It is part of an Anti-lock Brake System.

Edge Codes - Developed by Friction Materials Standards Institute, a double letter code (e.g., EE, FF, GG, FG) printed on the edge of a brake block to designate its range of friction in cold and hot test conditions.

EEC - On the approximation of the laws of the member states relating to the braking devices of certain categories of motor vehicles and their trailers. Published in the official journal of European Economic Communities.

Emergency Brake System - Not a separate system, emergency braking (in the event of air loss) involves various portions of the parking and service brake systems. See "Spring Brake."

End Play - Looseness in bearing clearance in an axial direction.

End Yoke - Connects the drive shaft to other driveline components.

Engine Brake - A system that allows for slowing of a vehicle that is independent of the conventional braking systems. A driver would normally downshift to slow his descent on a hill, using engine compression. The engine brake increases the effectiveness of this retarding force.

Exhaust Brake - Brake device using engine compression pressure as a retarding medium.

Fail-Safe, ABS - If the antilock brake system should fail during vehicle operation, a dash light warns the driver that ABS is disengaged. Meanwhile, the tractor's pneumatic system returns to normal relay valve functions and maintains standard air brake performance.

Fault Codes, ABS - A series of codes displayed by the selfdiagnostic portion of the ABS unit, isolating the section of the system that is now or has malfunctioned.

FC - Fast Change style brake shoes, with standard thickness lining.

FC XLII - Fast Change style brake shoes, with extra thick lining.

Federal Bridge Formula - Formula that limits the weight on groups of axles in order to reduce the risk of damage to highway bridges. Allowable weight depends on the number of axles a vehicle has and the distance between those axles. However, the single or tandem axle weight limits supersede the Bridge Formula limits for all axles not more than 96 in. apart.

FMSI - An industry standard number assigned to a brake shoe lining. All shoe linings that have the same FMSI number should dimensionally be the same regardless of brand. FMVSS 121 (Federal Motor Vehicle Safety Standard 121) - Performance Standard for air-braked vehicles.

Foam Insert - Foam piece also known as the compressible insert.

Foot Valve - A foot-operated valve controlling air pressure delivered to the brake chambers.

Force Balance - Optimum stopping capability requires tire-to road retarding forces in proportion to the loads on all wheels.

Return to Table of Contents

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Foundation Brake Balance - Foundation brake balance deals with the brake itself (not including the air system), brake lining, tire size, air chamber, slack length, etc. Can be separated into two different aspects, torque balance and thermal balance, between different axles.

Foundation Brake System - Term inclusive of mechanical components involved in providing braking force (i.e., brake chambers, slack adjusters, brake drums, rotors, and brake linings) on a vehicle.

Four Bag Suspension - A single axle air ride suspension with four air springs, usually located at each corner of the suspension structure. The suspension moves up and down as a parallelogram design.

Frame (Disc Brake) - Structural element which supports caliper and mounts brake assembly to torgue plate.

Friction Couple - Refers to the lining and drum combination used to convert kinetic energy to heat energy.

Front Axle Limiting Valve - See "Ratio Limiting Valve."

FT - A fabricated brake shoe comprised of a stamped shoe table and webs welded together.

Full-Floating Axle - Axle shaft transmits torque and the axle housing supports the vehicle ground load.

GAW (Gross Axle Weight) - Total weight on a specific axle position.

GAWR (Gross Axle Weight Rating) - The total weight capacity of an axle (single, tandem, or tridem).

GCW (Gross Combination Weight) - The weight of a truck and trailer combination and its entire contents.

GCWR (Gross Combination Weight Rating) - The total weight capacity of a truck and trailer combination and its entire contents as determined by axle ratings.

Gear Ratio, Axle - Ratio of the speed of the propeller shaft to the speed of the rear axle shaft.

Glad-Hand - A separable mechanical connector used to join air line hoses when combination vehicles are coupled together.

Grade - The degree of inclination of a road. Typically specified in percent (rise/100 ft run).

Gradeability - Percent grade that a vehicle will negotiate.

Grease-Stained Drum - A brake drum with discoloration of friction surface caused by, for example, improper greasing of brake camshaft or wheel seal leakage.

Gusset - A reinforcement welded to the camshaft bracket to provide additional support for severe service applications.

GVW (Gross Vehicle Weight) - The total weight capacity of a single vehicle.

GVWR (Gross Vehicle Weight Rating) - The total weight capacity of a single vehicle as determined by axle ratings.

Hand Valve - See "Trailer Control Valve."

Heat-Checked Drum - Brake drum with hairline cracks on friction surface caused by thermal cycling. Mild checking normally does not require drum replacement.

Heat-Spotted Drum - Brake drum with a pattern of hard, slightly raised dark spots of martinsite on its friction surface. Caused by localized overheating and sudden cooling, those spots should be ground off to prevent drum cracking, uneven lining wear, and loss of braking efficiency. If spots cannot be removed, the drum should be discarded. Heat spotting is promoted by light and steady braking on downgrades.

Helper Spring - Additional spring device permitting greater load on axle.

High Articulation Suspension - Type of suspension for off-road activity. Greater articulation or suspension travel is required to keep tires in contact with the ground.

High Entry Single - Front tandem axle used as a single axle.

Highway - A major road used for any form of motor transport, typically outside of any city limits and with road surfaces of acod to excellent concrete or asphalt.

Hold-Off Spring - A spring within a relay valve or quick release valve that is designed to retard valve operation until a predetermined amount of air pressure is exerted. See "Crack Pressure."

Horsepower - English unit used to denote the amount of work done in a given period of time, equal to 33,000 foot-pounds per minute.

Housing - A casing or container for mechanical components.

Housing Box - Cross-section of square-armed or rectangulararmed axle housing.

Hub Mount Wheel - Wheels that are designed to center on the hub at the bore of the wheel. These wheels generally have straightthrough bolt holes, since the bolt holes only supply clearance for the stud. Hub mount wheels are used with twopiece flange nuts.

Hypoid Gear - Modified Spiral Bevel Gear that allows the pinion to be positioned below the ring centerline.

Hysteresis - Difference between the amount of pressure needed to open a valve and the pressure drop needed to close it.

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I-Beam - Forged steel structural beam constructed in the shape of an "I."

Inertia Excitation - Excitation produced by the oscillating torque loads resulting from the driveshaft inertia being accelerated through non-uniform motion.

Inset Wheels (or Negative Offset) - The wheel centerline is positioned inboard of the wheel mounting surface.

Installation Angle - Angle that the drive shaft enters the differential relative to horizontal.

Integral Coach - Designed to carry passengers, the cab and body of this style coach are built as one, most often with rear engine design.

Integral Knuckle - One-piece steel knuckle forging made with both steer and tie rod arms forged into one piece.

Interaxle Differential - Gear device dividing power equally between axles and compensating for unequal tire diameters.

Interstate - One of a system of limited access highways extending between the major cities of the 48 contiguous United States.

Inversion Valve - Valve used on trucks to release air from the parking brake chambers and apply the rear brakes if the rear air reservoir fails, modulated by the brake pedal.

Jackknife - Uncontrollable articulation of a tractor-trailer typically resulting from lockup or spinning of tractor drive axle(s). The risk of jackknife is greatest on a slippery road with an empty or lightly laden trailer in tow.

Jake Brake - Trademark of engine brakes by the Vehicle Equipment Division of The Jacobs Manufacturing Co. See "Engine Brake."

Jam Nut - Second nut on a screw or bolt that locks against the first nut (i.e., jams against it) so that the nut won't come loose.

Kingpin - Front axle pin allowing wheels to steer vehicle. Also called knuckle pin.

Kingpin Angle - Angle of the kingpin in relation to a vertical line at the point of intersection on the ground at tire contact as viewed from the front or back.

Kingpin Cap - Bolt-on or threaded-in cap used to seal the outer sides of the upper and lower portion of the steer knuckle. This cap is used to prevent contamination from getting into the kingpin joint area.

Knuckle - Integral with the spindle, the inner portion of which is affixed to, and pivots on, the kingpin.

Knuckle Cap - See "Kingpin Cap."

Knuckle Pin - See "Kingpin."

Knuckle Seal - Seal built into inner side of the upper and lower portion of the steer knuckle. This seal is used to prevent contamination from entering the areas between the kingpin, the knuckle, and the beam.

KPI (Kingpin Intersection) - The distance between the intersection points of LH and RH steer knuckles pivot, or the points where the spindle axis crosses the kingpin axis.

Leak-Down Test - A common method of checking for air leaks. With the engine off, vehicle stationary, the air system at maximum governed pressure and all service brakes fully applied, there should be no more than a 3 psi/min. air loss noted on the dashmounted pressure gauge for straight trucks; 4 psi/min. for combination vehicles.

Liftable Axle - Axle that is capable of lifting off the ground and reducing load during parking maneuvers and lowering to the ground and reducing the load from bridge laws. See "Pusher Axle" and "Tag Axle."

Limited Access - Roads where access is controlled and limited to entrance and exit in designated areas such as highway ramps. See "Turnpike."

Limited-Slip Differential - Mechanical action that resists the free working of an ordinary differential, thus distributing a greater torque to the slower-turning wheel or axle.

Linehaul - Trucking involving moving different types of freight in high mileage operation (over 60,000 miles/year).

Lining Swell - Temporary swell of brake lining that occurs with heat, but returns to original when cooled.

Lining Growth - Permanent swelling of brake lining resulting from heat exposure. Occurs in new lining only.

LMS® (Low Maintenance System) - Optional packages are either lube for life or annual lube.

Locator Dowel Hole - Drilled hole located centrally on the spring pad drilling that is used to locate the caster block used to attach the springs to the steer axle.

Lockout Assembly - A shift unit that controls the operation of the interaxle differential in tandem drive axles. The operation of this unit is controlled from the vehicle cab by the driver and is activated by either air pressure from the vehicle's air reservoir (brakes) or by electrical means.

Long-Stroke Chamber - A brake chamber designed to have longer-than-normal push rod travel, adding safety factor to chamber stroke. For example, a regular, clamp-type, Type 30 chamber has a readjustment limit of 2 in. and a maximum stroke of 2.5 in. A Long has a readjustment limit of 2.5 in. and a maximum stroke of 3 in. Low Maintenance System - See "LMS®."

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Low Pressure Warning Device - Pressure-sensitive electrical switch that actuates an in-cab buzzer and warning light when air pressure falls below a predetermined level (typically, 60 psi).

Marion Support - A "tear-drop" shaped support that fits over the camshaft barrel located between the chamber bracket and the automatic brake adjuster (ABA). The Marion Support is welded to the axle housing after the brake assembly is mounted to the axle. This is an optional means of support where the BCCC dimension is 13.5 in. or longer.

Mechanical Suspension - A suspension that is not an air ride suspension.

Michigan Special Gravel Trains - An 11-axle combination permitted in Michigan with gross weights as high as 164,000 lbs.

Multiplexing - A means of sending discreet electrical signals to multiple devices along a common pair of wires.

Neutral Engagement Valve - A component of the pneumatic system that permits the service brake to be applied when the transmission is in neutral and the driver is out of the cab. Typically found on refuse trucks.

NoSPIN® - Speed-sensitive automatic locking differential. It powers both drive wheels while automatically permitting differential action to compensate for wheel speed differences from turning or driving on uneven surfaces.

OAW (Overall Width) - Width across the widest portion of the vehicle/axle/etc.

OEM (Original Equipment Manufacturer) - Company that first created the product.

Off-Highway - Refers to trucking usually performed on private logging roads, construction sites, mining locations, etc. Offhighway trucks are always constructed much more ruggedly as they are subjected to severe stresses.

On-Highway - Refers to trucking performed on turnpike quality roads, freeways or expressways.

On-/Off-Highway - Refers to trucking operations that involve traveling both on highways and on roads of lesser standards; typical of this is timber haulage wherein logs are hauled on forest tracks or roads, and then on the highway to a mill or rail sliding. Also livestock haulage when the loading point is some distance along a rough road, and the load is then moved to abattoirs or elsewhere on a highway or similar road. Original Equipment Manufacturer - See "OEM."

Out-of-Round Drum - Brake drum with variations in its inner diameter, causing reduced braking efficiency. An out-of-round drum often can be machined, within manufacturer's limits, to restore concentricity.

Outset Wheel - Wheel with a centerline of the tire outboard of the wheel mounting surface. Overall Width - See "OAW."

Overhang - The distance from the center of the leaf spring or air suspension bracket to the centerline of the tire/tires.

Oversized Drum - Refers to a brake drum having an inner diameter greater than the discard diameter marked on the drum by its manufacturer.

Parallelogram Suspension - A suspension with four trailing arms that allow the axle to travel in a linear motion without caster change.

Parking Brake - See "Spring Brake."

Parking Brake Priority - A type of trailer brake control valve that prioritizes delivery of air for quick release of a trailer's parking brakes after being hooked to a tractor. Charging a trailer's service reservoirs, to provide braking ability, is a secondary concern.

Pawl - A mechanical device allowing rotation in only one direction. One type consists of a hinged tongue, the tip of which engages the notches of a cogwheel, preventing backward motion.

Payload - Actual weight of useful cargo carried by the vehicle.

Piston Type Chamber - Incorporates a piston in place of the diaphragm inside the spring chamber. This chamber will provide approximately 30% to 40% higher pushrod output for parking. The service chamber, however, still utilizes a diaphragm. Piston type chambers are more common in Europe and also for transit buses in North America.

Pitman Arm - Arm attached between the steering gear sector shaft and the draglink that transmits the steering force from the cross shaft to the steering linkage system. This is how the rotary motion of the steering wheel is turned into lateral movement of the arm.

Planetary Double Reduction Axle - The double reduction axle provides greater overall gear reduction and is ideal for peak torque development and transmission. This feature makes the axle desirable for starting heavy loads in adverse terrain. The first reduction is through the primary gearing. The second reduction is with adjacent planetary gearing.

Planetary Gears - A gearing unit consisting of a ring gear with internal teeth, a sun or central pinion gear with external teeth, and a series of planet gears that mesh with both the ring and the sun gear. Frequently used in overdrives and automatic transmission. Also called epicyclic gearbox.

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PLC (Power Line Carrier) - A form of multiplexing wherein a discreet electrical signal is sent along a wire already carrying power for another purpose. PLC technology is used in tractor/ trailer communications, allowing more utility than the standard, J-560, 7-pin connector could otherwise afford.

Pneumatic Balance - Achieved when individual air chambers receive the air pressure required for each brake in the system to do its fair share of the work. Lack of pneumatic balance is most likely at low brake application pressures, rarely during panic stops.

Pneumatic Timing Balance - Achieved when individual air chambers sequentially receive air within a timeframe that ensures each brake in the system will do its fair share of the work. In a combination vehicle, lack of proper timing is likely to occur because tractor brakes receive air faster than trailer brakes. See "Trailer Push."

Pole Trailer - Trailer used to transport utility poles.

Polished Drums - A brake drum with a friction surface polished to a mirror-like finish by unsuitable brake linings. Remove gloss from drum with 80-arit emery cloth.

Pop-Off Valve - Jargon for a pressure-relief valve, installed in the service reservoir or wet tanks as insurance against over-pressurization.

Power Divider - See "Interaxle Differential."

Power Line Carrier - See "PLC."

Pressure Differential - Difference between the inlet and outlet air pressure of an open brake valve. Also, difference in air pressure between any two points within a brake system.

Pressure Level Balance - Obtained when all of the vehicles' brake chambers are receiving the required level of air pressure (once pressures have stabilized). This does not necessarily mean the same pressure. Different design brakes on the same vehicle may require different levels of air pressure. Pressures may be varied on different axles to compensate for different size brakes or different amount of underbody cooling received by the brakes.

Propeller Shaft - Driveshaft used to transmit torque from engine or transmission to rear axle.

Pumping the Brakes - Phrase denoting a rapid series of brake application (a.k.a. fanning) used to avoid locking brakes on axles during sudden stops. Phrase also may apply to a slower series of heavy brake application (a.k.a. snubbing) used in an attempt to prevent brake overheating and resultant fade on long downgrades.

Pup - See "Dolly."

Pusher Axle - A "dead axle" (no driving capability) used to give vehicle more weight carrying capacity. A pusher axle is ahead of the drive axle. A tag axle is behind the drive axle. This type of axle may have the capability of being raised or lowered and some are made to be steerable.

Push Rod - A rod, protruding from a brake chamber, that is connected to the arm of a slack adjuster via a clevis pin.

Quick-Release Valve - Designed to reduce the chance of brake drag, a valve that speeds the process of exhausting air from brake chambers when driver releases the brake treadle.

Radio Frequency Interference - See "RFI."

Ratio Limiting Valve - Prevents locking of front brakes by automatically limiting application pressure to steer axle during normal braking. Progressively harder braking, however, will progressively increase steer axle braking until maximum air pressure is applied

Regional Haul - On-highway usage within a region, typically a one-day round trip.

Relay Valve - Valve located near a reservoir that is activated by a control signal from another valve that usually is farther away. It is used to speed the application of brakes on drive and trailer axles.

Release Time - Time between release of brake treadle and total disengagement of brake linings and brake drums. Or, per FMVSS-121, the time required to reduce pressure to 5 psi from 95 psi within all service chambers.

Relief Pressure - Maximum pressure where the steering gear is protected from providing too much load into the steering system.

Retarder - Auxiliary speed-reducing device.

Return Springs - Springs that retract brake shoes upon release of the brake treadle.

Reverse Cam Rotation - When the axle is installed into the vehicle in such a way that the brake cam rotates opposite to the forward normal turning direction of the tire.

RFI (Radio Frequency Interference) - External interference or false signals from such sources as radar, citizens-band radio, other types of radio transmissions and television signals. While the effects of this interference on ABS were a concern during the 1970's, today's technology has virtually eliminated the problem.

Ring Gear - The large bevel, circular gear that is attached to the flange or carrier of the differential case. It meshes with the drive pinion on the end of the propeller shaft.

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Rolled Over - Axle used when engine is located behind axle; typically the pinion will be above the centerline.

Rolling Resistance - Sum of the forces at area of contact between a vehicle's tires and road surface acting against the direction of movement.

Roll-Off Containers - Detachable open containers generally used for hauling refuse, scrap, and construction debris that are hoisted

or winched over the rear of the truck chassis for transport.

Rotor - Braking surface for disc brake system. On heavy trucks the rotor is generally cast iron and has vented design. The rotor can be either separate or integral to the hub. Rotors are also referred to as discs.

SAE (Society of Automotive Engineers) - An international organization of automotive/truck/bus engineers who develop test procedures and requirements for all ground transportation vehicles and their components.

SAP - Single anchor pin-type brakes.

S-cam Brake - Type of brake where mechanically induced rotation of an S-shaped cam forces brake linings against the brake drum.

Scored Drum - Brake drum with a grooved friction surface, resulting in excessive lining wear. Severe scoring requires that a drum be machined, within manufacturer's limits, before replacing the linings.

Secondary - Roads that are typically well-maintained gravel or crushed rock; surface conditions are not as favorable as on primary roads.

Semi-Active Suspension - A suspension that changes its ride quality in response to hitting a bump or alteration in the road. This change must occur in milliseconds to be effective.

Semi-Trailer - Trailer used in connection with truck tractor.

Sensor Sleeve - Rigid steel sleeve mounted in the knuckle to provide a pilot for the ABS sensor to be mounted in close proximity to the tone ring on the hub.

Service Brake Priority - A type of trailer brake control valve that prioritizes delivery of air to a trailer's service reservoirs, to provide braking ability, after being hooked to a tractor. Releasing a trailer's parking brakes is a secondary concern.

Service Brake - As opposed to spring or parking brakes, that portion of the brake system used for normal brake application while driving.

Shift Inhibitor - Pneumatic-mechanical system that delays the shifting process until the engine has returned to idle speed. This prevents drivetrain damage due to high RPM shifting.

Shims - Spacers used to fill in the space between knuckle and top of beam after thrust washer is installed on the bottom side of the beam.

Single-Reduction Axle - Any axle assembly with only one gear reduction through its differential ring gear and drive pinion.

Site Travel - Slow speed operation up to 5 mph at a job site not to exceed 5% of total operating miles of the vehicle.

Slack Adjuster - Also called a brake adjuster, this is a lever connecting the brake chamber push rod with the foundation brake camshaft. It provides torque to rotate the brake camshaft when the brake treadle is depressed. It also provides a means of adjusting clearance between brake shoes and the drum to compensate for lining wear. Some models are automatic while others require manual adjustment. See "ABA."

Slip Torque - Engine torque required to slip wheels on the driving surface.

SLR (Static Loaded Radius) - The distance from the centerline of the axle to the ground, underrated tire capacity, with the tire at rest.

SMC (Suspension Mounting Centers) - The distance between centerlines of where the suspension clamps to the axle.

Soft Dampened Clutch - Special type of clutch that features a torsional mechanism that avoids impact loads being transmitted through the driveline.

Speed Sensor, ABS - An electromagnetic device that, in conjunction with a rotating toothed wheel, generates an electrical signal proportional to the wheel speed and transmits the information to the ABS Electronic Control Unit (ECU).

Spider - Spider-like casting or forging containing axle differential or the foundation brake structural member.

Spindle - A shaft-like projection from the steering knuckle or the drive axle housing to which the wheel is mounted.

Spinout - When the maximum drive slip resistance has been exceeded by its tractive effort and a sudden increase in drive wheel speed occurs.

Spiral Bevel Gear - The teeth of both the ring and the pinion are tapered and are cut on a spiral so that they are at an angle to the centerline of the pinion shaft.

Spitter Valve - Slang for automatic drain valve.

Spline - Series of parallel keys cut along the driveshaft that mate with corresponding slots in hub or fitting. Also found on brake camshaft interface to slack adjuster.

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