Peterbilt 320 Service Manual
Model 320
Body Builder Manual
For Trucks Produced After November 2013
BODY BUILDER MANUAL CONTENTS
SECTION 1: INTRODUCTION
SECTION 2: SAFETY AND COMPLIANCE
SAFETY SIGNALS v
FEDERAL MOTOR VEHICLE SAFETY STANDARDS (FMVSS) AND
CANADIAN MOTOR VEHICLE SAFETY STANDARDS (CMVSS) COMPLIANCE vi
SECTION 3: DIMENSIONS
INTRODUCTION 3-1
ABBREVIATIONS 3-1
OVERALL DIMENSIONS 3-2
FRAME RAILS 3-4
FRAME HEIGHT CHARTS 3-6
REAR SUSPENSION LAYOUTS 3-13
Reyco 79K Single 3-14
Reyco 102AR Single 3-15
Neway AD252 3-16
Neway AD378 3-17
Peterbilt Air Leaf 3-18
Peterbilt Air Trac Single 3-19
Peterbilt Air Trac Tandem 3-20
Peterbilt Air Trac Tri-Drive 3-21
Peterbilt Low Air Leaf 3-22
Chalmers 854 3-23
Hendrickson HMX 3-24
Hendrickson RT/RTE 3-25
Hendrickson HN 3-26
Hendrickson R 3-27
Hendrickson RS 3-28
PUSHER AND TAG LAYOUTS 3-29
Hendrickson 3-29
Watson-Chalin 3-33
EXHAUST HEIGHT CALCULATIONS 3-37
GROUND CLEARANCE CALCULATIONS 3-38
OVERALL CAB HEIGHT CALCULATIONS 3-39
FRAME COMPONENTS 3-40
Fuel Tanks 3-40
EXHAUST SYSTEM 3-41
SECTION 4: BODY MOUNTING
INTRODUCTION 4-1
FRAME RAILS 4-1
CRITICAL CLEARANCES 4-2
BODY MOUNTING USING BRACKETS 4-3
Brackets 4-4
Mounting Holes 4-5
Frame Drilling 4-6
BODY MOUNTING USING U–BOLTS 4-7
Rear Body Mount 4-9
TABLE OF CONTENTS
SECTION 5: FRAME MODIFICATIONS
INTRODUCTION 5-1
DRILLING RAILS 5-1
MODIFYING FRAME LENGTH 5-2
CHANGING WHEELBASE 5-2
CROSSMEMBERS 5-3
TORQUE REQUIREMENTS 5-4
SECTION 6: ELECTRICAL 320 FAMILY
CONTROL UNIT IDENTIFICATION 6-1
Functional Description-Cab Electronic Control Unit (CECU) 6-1
HOW MULTIPLEXED INSTRUMENTS WORK 6-2
CECU Architecture 6-2
Power On Self-Test 6-3
ELECTRICAL INTERFACE 6-4
Cab Harness 6-4
Chassis Harness 6-5
Body Builder Harness Extension 6-6
J1939 6-7
SECTION 8: PTO SECTION
INTRODUCTION 7-1
TRANSMISSION MOUTED PTO – GENERAL 7-1
FRONT ENGINE PTO 7-3
REAR ENGINE PTO 7-4
PTO INSTALLATIONS 7-5
REMOTE PTO CONTROL (12 PIN CONNECTOR) 7-6
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SECTION 1 INTRODUCTION
The Peterbilt 320 Body Builder Manual was designed to provide body builders with a comprehensive information set to
guide the body planning and installation process. Use this information when installing bodies or other associated
equipment.
In this manual you will find appropriate dimensional information, guidelines for mounting bodies, modifying frames,
electrical wiring configurations, as well as other information useful in the body installation process.
The Peterbilt 320 Body Builder Manual can be very useful when specifying a vehicle, particularly when the body builder is
involved in the vehicle selection and component ordering process. Information in this manual will help reduce overall costs
through optimized integration of the body installation with vehicle selection.
As products continually evolve, Peterbilt reserves the right to change specifications or products at any time without prior
notice. It is the responsibility of the user to ensure that he is working with the latest released information. If you require
additional information or reference materials, please contact your local Peterbilt dealer.
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2
SAFETY AND COMPLIANCE
SECTION 2 SAFETY AND COMPLIANCE
SAFETY SIGNALS
A number of alerting messages are shown in this book. Please read and follow them. They are there for your protection
and information. These alerting messages can help you avoid injury to yourself or others and help prevent costly damage
to the vehicle.
Key symbols and “signal words” are used to indicate what kind of message is going to follow. Pay special attention to
comments prefaced by “WARNING”, “CAUTION”, and “NOTE.” Please don't ignore any of these alerts.
WARNING
When you see this word and symbol, the message that follows is especially vital. It signals a potentially
hazardous situation which, if not avoided, could result in death or serious injury. This message will tell you what
the hazard is, what can happen if you don’t heed the warning, and how to avoid it.
Example:
WARNING! Be sure to use a circuit breaker designed to meet liftgate amperage requirements. An incorrectly
specified circuit breaker could result in a electrical overload or fire situation. Follow the liftgate installation
instructions and use a circuit breaker with the recommended capacity.
CAUTION
Signals a potentially hazardous situation which, if not avoided, could result in minor or moderate injury or
damage to the vehicle.
Example:
CAUTION: Never use a torch to make a hole in the rail. Use the appropriate drill bit.
NOTE
Provides general information: for example, the note could warn you on how to avoid damaging your vehicle or
how to drive the vehicle more efficiently.
Example:
NOTE: Be sure to provide maintenance access to the battery box and fuel tank fill neck.
Please take the time to read these messages when you see them, and remember:
WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION Signals a potentially hazardous situation which, if not avoided, could result in minor or moderate injury or
damage to the vehicle.
NOTE Useful information that is related to the topic being discussed.
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SAFETY AND COMPLIANCE
FEDERAL MOTOR VEHICLE SAFETY STANDARDS (FMVSS) AND CANADIAN MOTOR
VEHICLE SAFETY STANDARDS (CMVSS) COMPLIANCE
As an Original Equipment Manufacturer (OEM), Peterbilt Motors Company ensures that our products comply with all
applicable Federal Motor Vehicle Safety Standards (FMVSS) and Canadian Motor Vehicle Safety Standards (CMVSS)
where applicable. However, the fact that this vehicle has no fifth–wheel and that a Body Builder (Final Stage
Manufacturer) will be doing additional modifications means that the vehicle was incomplete when it left the build plant.
Incomplete Vehicle Certification
An Incomplete Vehicle Document is shipped with the vehicle, certifying that the vehicle is not complete (see Figure 2-1).
In addition, affixed to the driver’s side door frame or edge is an Incomplete Vehicle Certification label.
NOTE: These documents list the FMVSS (or CMVSS) regulations that the vehicle complied with when it
left the build plant. You should be aware that if you modify or alter any of the components or systems
covered by these FMVSS (or CMVSS) regulations, it is your responsibility as the Final Stage
Manufacturer to ensure that the complete vehicle maintains compliance with the particular FMVSS (or
CMVSS) regulations when you complete your modifications.
FIGURE 2-1. Incomplete Vehicle Certification Document FIGURE 2-2. Location of Certification Labels -Driver’s Door Frame
As the Final Stage Manufacturer, you should retain the Incomplete Vehicle Document for your records. In addition, you
should record and retain the manufacturer and serial number of the tires on the vehicle. Upon completion of the vehicle
(installation of the body and any other modifications), you should affix your certification label to the vehicle as required by
Federal law. This tag identifies you as the “Final Stage Manufacturer” and certifies that the vehicle complies with Federal
Motor Vehicle Safety Standards.
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2
SAFETY AND COMPLIANCE
Trucks equipped with a “Vehicle Emission Control Information” door label are certified to comply with United States
Greenhouse Gas (GHG) regulations. Original tires may be substituted provided the new tires possess an equal to or lower
Coefficient of rolling resistance (Crr).
The Emission Controls shown in Figure 2-3 may be indicated on the label.
FIGURE 2-3. Incomplete Vehicle Certification Document
Noise and Emissions Requirements
NOTE: This truck may be equipped with a Diesel Particulate Filter (DPF) muffler unit in order to meet
both noise and exhaust emissions requirements. Removal or tampering with the DPF muffler will not
improve engine performance. Also tampering with the exhaust system is against the rules that are
established by the U.S. Code of Federal Regulations and Environment Canada Regulations. The
DPF muffler may only be replaced with an approved part.
NOTE: 2007/10/13 emissions engines are integrated with particulate filters for 2007/10/13 EPA
certification. The particulate filter assembly may consist of one or more of the following components: a
diesel oxidation catalyst, a diesel particulate filter, temperature sensors, differential pressure sensor, and
exhaust silencing components integrated into a modular housing. Body Builders must not modify or
relocate this assembly or any components associated with it. It is also the case that there should not be
any modifications made to the exhaust piping from turbo outlet to aftertreatment inlet.
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SECTION 3 DIMENSIONS
CA
Cab to axle. Measured from the back of the cab to the centerline of the rear axle(s).
EOF
Frame rail overhang behind rear axle--measured from the centerline of tandems
FS
Front suspension height
RS
Rear suspension height
WB
Wheelbase
SOC
Side of cab
BOC
Back of cab
INTRODUCTION
This section has been designed to provide enough information to successfully layout a chassis in the body planning
process. All dimensions are inches unless otherwise noted. Optional equipment may not be depicted. Please contact
your local Peterbilt dealer if more dimensional information is desired.
ABBREVIATIONS
Throughout this section and in other sections as well, abbreviations are used to describe certain characteristics on your
vehicle. Table 3-1 below lists the abbreviated terms used.
TABLE 3-1. Abbreviations Used
3
DIMENSIONS
OVERALL DIMENSIONS
This section includes drawings and charts of the Peterbilt Model 320.
On the pages that follow, detail drawings show particular views of the vehicle; all dimensions are in inches (in). They
illustrate important measurements critical to designing bodies of all types. See the “Contents” at the beginning of the
manual to locate the drawing that you need.
All heights are given from the bottom of the frame rail.
Peterbilt also offers .dxf files and frame layouts of ordered chassis prior to build. Please speak with your salesman to
request this feature when specifying your chassis.
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DIMENSIONS
MODEL 320
Notes:
1. Dimension header to seat base
2. Dimension seat base to floor
3. Door dimension is 33.4”W x 61”H
FIGURE 3-1. 320 Cab Dimensions
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DIMENSIONS
FRAME RAILS
Frame rail configurations are shown in Figure 3-2. The under cab area of the 320 frame rails are splayed as shown in
Figure 3-3. Frame height, flange and structural values can be found in the Body Mounting Section.
FIGURE 3-2. Frame Rail Configurations
NOTE: The outserted frame section does not extend through the rear suspension area. The outserted frame
section does not extend through the splayed area.
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DIMENSIONS
FIGURE 3-3. Model 320 Frame Rail
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DIMENSIONS
FRAME HEIGHT CHARTS
FIGURE 3-4. Frame Height
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DIMENSIONS
TABLE 3-2. Front Frame Height “A” – 320
NOTES:
1) Omit spacer block standard.
2) 25mm spacer block standard and required.
3) Standard 3-1/2" drop axle heights shown, for 5" drop axles, subtract an additional 1-1/2".
4) Spacer blocks are used by Engineering to obtain level frame and are not options.
5) "A" dimension shown is to bottom of frame rail. Add frame rail height dimension for frame height.
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Suspension
Rating
Version
Light
Height
Laden
Height
LOW AIR LEAF
21,000 lbs.
Standard
6.8
6.5
AIR TRAC
20,000 lbs.
Standard
11.4
11.0
23,000 lbs.
Standard
11.4
11.0
REYCO 79KB
20,000 lbs.
Taper-leaf (3.38"
saddle)
9.4
11.8
21,000 lbs.
Taper-leaf (1.38"
saddle)
7.4
9.8
23,000 lbs.
Multi-leaf (1.38"
saddle)
8.8
11.6
26,000 lbs.
Multi-leaf (1.38"
saddle)
9.2
11.8
28,000 lbs.
Multi-leaf (1.38"
saddle)
9.6
12.3
31,000 lbs.
Multi-leaf (1.38"
saddle)
10.7
13.3
REYCO 102
23K-29K lbs.
4.38 saddle
12.0
10.2
23K-29K lbs.
4.63 saddle
12.2
10.4
29,000 lbs.
3.50 saddle
11.7
10.0
31,000 lbs.
3.50 saddle
12.2
10.5
31,000 lbs.
4.38 saddle
12.5
10.7
31,000 lbs.
4.63 saddle
12.7
10.9
REYCO 102AR (AIR)
17K -23K
Standard
9.3
9.3
Low
8.3
8.3
DIMENSIONS
REAR FRAME HEIGHTS "C"
TABLE 3-3. Single Drive Suspension Heights
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Suspension
Rating
Version
Light
Height
Laden
Height
AIR LEAF
38,000 lbs.
12.0
11.7
LOW AIR LEAF
40,000 lbs.
8.8
8.5
FLEX AIR
38,000 lbs.
8.8
8.5
LOW-LOW AIR
LEAF
40,000 lbs.
6.8
6.5
AIR TRAC
40K-46K lbs.
11.4
11.0
QUADRAFLEX
38,000 lbs.
Taper-leaf
10.6
8.7
Suspension
Rating
Version
Light
Height
Laden
Height
NEWAY AD
52,000 lbs.
10.0
10.0
NEWAY ADZ
46K-52K lbs.
10.0
10.0
Suspension
Rating
Version
Light
Height
Laden
Height
REYCO 102
MULTILEAF
40,000 lbs.
1.75 saddle (STD)
11.7
9.8
1.38 saddle
10.2
8.3
3.38 saddle
13.4
11.5
44,000 lbs.
1.75 saddle (STD)
11.7
9.8
1.38 saddle
11.5
9.7
REYCO 102AR
(AIR)
34K-40K
STD LOW
8.3
8.3
DIMENSIONS
TABLE 3-4. Tandem Drive Peterbilt Suspension Heights
TABLE 3-5. Tandem Drive Neway Suspension Heights
TABLE 3-6. Tandem Drive Reyco Suspension Heights
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Suspension
Rating
Version
Light
Height
Laden
Height
CHALMERS 854 &
860
40,000 lbs.
LOW
11.1
8.9
HIGH
12.4
10.2
X-HIGH
14.5
12.2
XX-HIGH
17.2
14.9
CHALMERS 854 &
860
46,000 lbs.
LOW
11.3
8.9
HIGH
12.5
10.1
X-HIGH
14.7
12.2
XX-HIGH
17.3
14.9
CHALMERS 854 &
860
50K-52K
LOW
11.3
8.9
HIGH
12.5
10.1
X-HIGH
14.6
12.1
XX-HIGH
17.3
14.8
CHALMERS 872
46,000 lbs.
LOW
11.2
8.8
HIGH
12.5
10.3
X-HIGH
14.6
12.2
XX-HIGH
17.3
14.9
CHALMERS 872
50,000 lbs.
LOW
11.2
8.8
HIGH
12.5
10.3
X-HIGH
14.6
12.1
XX-HIGH
17.3
14.8
DIMENSIONS
TABLE 3-7. Tandem Drive Chalmers Suspension Heights
NOTES:
1) Laden dimension shown with standard restrictor cans. Add 0.7” for #29 High Stability Restrictor Cans.
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Suspension
Rating
Version
Light
Height
Laden
Height
RT-403
40,000 lbs.
6.00
9.9
8.9
7.188 (std.)
11.2
10.1
RTE-403
40,000 lbs.
6.00
9.9
8.4
7.188 (std.)
11.2
9.5
R-403
40,000 lbs.
12.80
5.8
5.8
15.81 (std.)
8.8
8.8
17.60
10.6
10.6
RS-403
40,000 lbs.
12.25
9.9
9.1
14.00 (std.)
11.7
10.8
15.25
12.9
12.1
HMX
40,000 lbs.
16.5 (low)
10.6
9.5
18.5 (std.)
12.6
11.5
HMX
46,000 lbs.
16.5 (low)
10.6
9.5
18.5 (std.)
12.6
11.5
HN462
46,000 lbs.
20.25 (high)
15.0
13.3
R-463
46,000 lbs.
15.75 (std.)
8.8
8.8
20.50
13.5
13.5
RS-463
46,000 lbs.
12.25
9.7
8.9
14.0 (std.)
11.5
10.6
15.25
12.7
11.9
RT-463
46,000 lbs.
6.00
11.3
10.5
7.188 (std.)
13.0
11.4
11.00
16.3
15.2
RTE-463
46,000 lbs.
7.188 (std.)
11.6
10.2
11.00
15.4
14.0
RS-503
50,000 lbs.
14.0 (std.)
11.7
10.8
15.25
12.9
12.1
RT-503
50,000 lbs.
7.188 (std.)
12.1
11.1
11.0 1
16.4
15.4
RTE-503
50,000 lbs.
7.188 (std.)
11.6
10.2
11.00
15.4
14.0
RS-523
52,000 lbs.
14.0 (std.)
11.7
10.8
RT-523 , RT-650
52K-65K
7.188 (std.)
12.1
11.1
11.00
16.4
15.4
HN522
52,000 lbs.
18.50 (std.)
12.6
11.5
RS650
65,000 lbs.
15.00 (std.)
12.0 1
11.0 2
19.00
16.0 2
15.1 2
R650 *
65,000 lbs.
20.25 (std.)
12.5
12.5
R850 w/70K Meritor
85,000 lbs.
20.25
12.0
12.0
R850 w/SISU 70K
20.25
12.1
12.1
RS850 w/SISU 70K
85,000 lbs.
16.75
11.5
10.6
DIMENSIONS
TABLE 3-8. Tandem Drive Hendrickson Suspension Heights
NOTES:
1) With SISU 70k axle subtract 0.39” from light/laden
2) With SISU 70k axle subtract 0.28” from light and 0.39” from laden
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SUSPENSION
RATING (lbs.)
LIGHT (in.)
LOADED
(in.)
TRI-DRIVE SUSPENSION
AIR TRAC
40K-46K
11.4
11.0
NEWAY ADZ369
69,000
10.0
10.0
NEWAY ADZ378
78,000
10.0
10.0
DIMENSIONS
TABLE 3-9. Tri-Drive Suspension Heights
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DIMENSIONS
REAR SUSPENSION LAYOUTS
The rear suspension layouts are provided as a tool to help layout bodies prior to arrival. The applicable dimensions are
shown. Verify the axle spacing that is shown, as alternate spacings may exist and could change some of the dimensions.
The dimensions shown below are the most typical installations, in special cases some hole locations will move.
If the holes shown will be used for body installation, please confirm with the local Peterbilt dealer the drawing below will be
the installation used on the specific truck. In this case, ordering the frame layout of the chassis is advised. This can be
done on any Peterbilt truck, and will be provided ahead of the build schedule. Ensure proper torque to reinstall any
suspension components. See Tables 5-1 and 5-2 on page 5-4.
For hole locations not detailed, please work with the local Peterbilt Dealer to request that information.
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DIMENSIONS
FIGURE 3-5. Reyco 79KB Frame Drilling
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DIMENSIONS
FIGURE 3-6. Reyco 102 Frame Drilling (Dimensions In Millimeters)
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DIMENSIONS
FIGURE 3-7. Neway AD 252 Frame Drilling
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