This service manual was written expressly for Toro service technicians. The Toro Company has
made every effort to make the information in this manual complete and correct.
Basic shop safety knowledge and mechanical/electrical skills are assumed. The Table of Contents
lists the systems and the related topics covered in this manual.
The following service materials are available in addition to this service manual:
Hydrostatic Pumps:Hydro-Gear BDP-10A/16A/21L - Service and Repair Manual
Form #492-4789
Wheel Motors:Parker/Ross Wheel Motor Service Manual
This manual is intended as a service and repair manual
only. The safety instructions provided herein are for
troubleshooting, service, and repair of the Z Master Z400
Series Zero-turn Riding Mower.
Think Safety First
Avoid unexpected starting of engine...
Always turn off the engine and disconnect the spark
plug wire(s) before cleaning, adjusting, or repair.
Avoid lacerations and amputations...
This symbol means WARNING or
PERSONAL SAFETY INSTRUCTION
- read the instruction because it has to
do with your safety. Failure to comply
with the instruction may result in
personal injury or even death.
The riding mower and attachment operator’s manual
contain safety information and operating tips for safe
operating practices. Operator’s manuals are available
through the Internet, your Toro parts source, or:
The Toro Company
Publications Department
8111 Lyndale Avenue South
Bloomington, MN 55420
Avoid injury from batteries...
Battery acid is poisonous and can cause burns. Avoid
contact with skin, eyes, and clothing. Battery gases
can explode. Keep cigarettes, sparks, and flames away
from the battery.
Stay clear of all moving parts whenever the engine is
running. Treat all normally moving parts as if they were
moving whenever the engine is running or has the
potential to start.
Avoid burns...
Do not touch the engine, muffler, or other components
which may increase in temperature during operation,
while the unit is running or shortly after it has been
running.
Avoid fires and explosions...
Avoid spilling fuel and never smoke while working with
any type of fuel or lubricant. Wipe up any spilled fuel or
oil immediately. Never remove the fuel cap or add fuel
when the engine is running. Always use approved,
labeled containers for storing or transporting fuel and
lubricants.
Avoid asphyxiation...
Never operate an engine in a confined area without
proper ventilation.
Avoid injury due to inferior parts...
Use only original equipment parts to ensure that
important safety criteria are met.
Avoid injury to bystanders...
Always clear the area of bystanders before starting or
testing powered equipment.
Avoid injury due to projectiles...
Always clear the area of sticks, rocks, or any other
debris that could be picked up and thrown by the
powered equipment.
Avoid modifications...
Never alter or modify any part unless it is a factory
approved procedure.
Avoid unsafe operation...
Always test the safety interlock system after making
adjustments or repairs on the machine. Refer to the
Electrical section in this manual for more information.
1-2Z Master Z400 Service Manual
SPECIFICATIONS
Safety Information . . . . . . . . .
Specications . . . . . . . . . . .
Chassis . . . . . . . . . . . . . .
Hydraulic System . . . . . . . . .
Engine . . . . . . . . . . . . . . .
1
2
3
4
5
Electrical . . . . . . . . . . . . . .
Mower Decks . . . . . . . . . . .
2-1Z Master Z400 Service Manual
6
7
2
SPECIFICATIONS
Z 400 Estate Series
19 hp Kawasaki OHV V-Twin
Fig 001 DSC-4765a
Fig 002 DSC-4766aFig 004 DSC-4768a
Fig 003 DSC-4767a
2-2Z Master Z400 Service Manual
Z 400 Estate Series
18 hp Kohler
SPECIFICATIONS
2
Fig 005 DSC-4842a
Fig 006 DSC-4843aFig 008 DSC-4846a
Fig 007 DSC-4844a
2-3Z Master Z400 Service Manual
2
SPECIFICATIONS
Z 450 Pro Performance Series
20 hp Kohler OHV V-Twin
Fig 009 DSC-4833a
Fig 010 DSC-4834aFig 012 DSC-4838a
Fig 011 DSC-4835a
2-4Z Master Z400 Service Manual
SPECIFICATIONS
Z 100 Series
19 hp Kawasaki KAI OHV V-Twin
Fig 013 DSC-0437aFig 015 DSC-0440a
2
Fig 014 DSC-0436a
Fig 016 DSC-0435a
2-5Z Master Z400 Service Manual
2
SPECIFICATIONS
Z 450 Pro Performance Series
23 hp Kawasaki OHV V-Twin
Fig 017 DSC-0444a
Fig 018 DSC-0445aFig 020 DSC-0448a
Fig 019 DSC-0442a
2-6Z Master Z400 Service Manual
Z 440 Pro Value Series
19 hp Kawasaki KAI OHV V-Twin
SPECIFICATIONS
2
Fig 021 DSC-0452a
Fig 022 DSC-0451aFig 024 DSC-0450a
Fig 023 DSC-0455a
2-7Z Master Z400 Service Manual
SPECIFICATIONS
Engines
OutputMakeHigh IdleLow IdleCharging Coil
2
19 HP (14.2kW)Kawasaki
OHV V-Twin Forced Air Cooled
18 HP (13.4kW)Kohler
OHV Single Forced Air Cooled
19 HP (14.2kW)Kawasaki
OHV V-Twin Forced Air Cooled
20 HP (14.9kW)Kohler
OHV V-Twin Forced Air Cooled
23 HP (17.1kW)Kawasaki
OHV V-Twin Forced Air Cooled
19 HP (14.2kW)Kawasaki
OHV V-Twin Forced Air Cooled
3650 + 100 RPM1500 RPM13 AMP
3650 + 100 RPM1500 RPM13 AMP
3650 + 100 RPM1500 RPM13 AMP
3650 + 100 RPM1500 RPM13 AMP
3650 + 100 RPM1500 RPM13 AMP
3650 + 100 RPM1500 RPM13 AMP
Dimensions and Weight
ROPS HeightWidth
ModelWeightFoldedUprightDeckDeectorLength
19 HP Kawasaki
52” 7-Gauge Deck
18 HP Kohler
48” 7-Gauge Deck
924 lbs
(419.2kg)
889 lbs
(407.78kg)
51”
(129.54cm)
51”
(129.54cm)
69”
(175.26cm)
69”
175.26cm)
53.7”
(136.4cm)
49.7”
(126.24cm)
68”
(172.72cm)
64”
(162.56cm)
78”
(198cm)
78”
(198cm)
19 HP Kawasaki
44” SFS Deck
19 HP Kawasaki
48” TF Deck
20 HP Kohler
52” TF Deck
19 HP Kawasaki
52” TF Deck
23 HP Kawasaki
52” TF Deck
23 HP Kawasaki
48” TF Deck
19 HP Kawasaki
44” SFS Deck (112cm)
23 HP Kawasaki
52” TF Deck (132cm)
2-8Z Master Z400 Service Manual
941 lbs
(426.83kg)
1010 lbs
(458.13kg)
1092 lbs
(495-32kg)
1092 lbs
(495-32kg)
1092 lbs
(495-32kg)
1067 lbs
(483-98kg)
941 lbs
(426.83kg)
1092 lbs
(495.32kg)
52”
(132.08cm)
52”
(132.08cm)
52”
(132.08cm)
52”
(132.08cm)
52”
(132.08cm)
52”
(132.08cm)
52”
(132.08cm)
52”
(132.08cm)
70”
(177.8cm)
70”
(177.8cm)
70”
(177.8cm)
70”
(177.8cm)
70”
(177.8cm)
70”
(177.8cm)
70”
(177.8cm)
70”
(177.8cm)
47”
(119.38cm)
49.7”
(126.24cm)
53.7”
(136.4cm)
53.7”
(136.4cm)
53.7”
(136.4cm)
49.7”
(126.24cm)
47”
(119.38cm)
53.7”
(136.4cm)
61.3”
(155.7cm)
64”
(162.56cm)
68”
(172.72cm)
68”
(172.72cm)
68”
(172.72cm)
64”
(162.56cm)
61.3”
(155.7cm)
68”
(172.72cm)
78”
(198cm)
78”
(198cm)
78”
(198cm)
78”
(198cm)
78”
(198cm)
78”
(198cm)
78”
(198cm)
78”
(198cm)
SPECIFICATIONS
Z 400 Series Manual Specications
Frame AssemblyConsists of front and rear frames bolted together
Front FrameWelded 2 x 2 x .188” structural steel tube, 7 Gauge front cross member
Rear FrameWelded tube and fabricated steel
Fuel System
TanksDual fuel tanks containing large ll necks and vented caps. Rotational
molded high density polyethylene. Mounted above drive wheels.
Capacity10 gallons (37.8 l) [5 gallons per tank]
Check ValveIn-line check valves
Fuel Filter15 micron, replaceable in-line lter
Traction System
Models with 7-Gauge DeckModels with SFS and TF Decks
Hydraulic PumpsHydroGear 10cc BDP-10A with
2300psi shock valve
Pump Drive
Wheel MotorsParker TE Series (13.9cc)HydroGear HGM-15E (15.4cc)
Rubber discharge chute, spring
biased down toward operating
position
Adjustable from the seat with range of 1.5” (38mm) – 4.5” (114mm) in .25” (6.4mm) increments.
44” (111.8cm)
SFS Deck
Side Discharge, mid-mounted rotary with three blades.
Drawn 12
gauge steel
super ow
system deck
with welded
mounting
brackets and
gage wheel
brackets. 1/2”
(12.7mm)
diameter steel
reinforcement
rod on left
side. 11 gauge
steel front
reinforcement
plate doubles
as bagger
attachment
point
system, welded construction.
3/8” (9.5mm) steel discharge
reinforcement plate doubles
as a bagger attachment point.
Rubber discharge chute, spring
biased down toward operating
position. Adjustable ow
control bafe.
18,000+ ft/min (548.640cm/min) at high idle
52” (132.1cm)
TF Deck
112cm (44”)
SFS Deck
Drawn 12
gauge steel
super ow
system deck
with welded
mounting
brackets and
gage wheel
brackets. 1/2”
(12.7mm)
diameter steel
reinforcement
rod on left
side. 11 gauge
steel front
reinforcement
plate doubles
as bagger
attachment
point.
discharge
chute, spring
biased down
toward
operating
position
132cm (52”)
TF Deck
7 Gauge,
High Strength
50,000 psi
(3515.3 Kg-f
/ 59cm) steel
5” (12.7cm)
advanced
Turbo Force
ow system,
welded
construction.
3/8” (9.5mm)
steel
discharge
reinforcement
plate doubles
as a bagger
attachment
point.
Rubber
discharge
chute, spring
biased down
toward
operating
position.
Adjustable
ow control
bafe.
2
2-11Z Master Z400 Service Manual
SPECIFICATIONS
Cutting Decks cont.
2
48” (121.9cm)
&
52” (132.1cm)
7-Gauge Deck
Deck
Suspension
Belt CoversPlastic HDPE
Gage WheelsThree
Deck
suspended
from machine
by four lift
chains, and
attached to
front cross
member by at
strut arms and
cross brace.
The deck is
pulled along
the ground.
deck covers.
Attached with
swell latches.
adjustable
gage wheels
to reduce
scalping on
the front of
deck (one on
the left-hand
side and two
in the center).
Wheels
have four
adjustment
positions.
44” (111.8cm)
SFS Deck
Deck suspended from machine by four lift chains, and attached to rear
wheel supports by two struts. The deck is pulled along the ground.
14-gauge,
formed steel
covers with
access holes
to allow
greasing of
outer spindles
without
removal.
Attached with
draw latches.
Three adjustable gage wheels to reduce scalping: three on front of deck (one
on left-hand side and two in center). Wheels have four adjustment positions.
Rear gage wheels are optional.
48” (121.9cm)
TF Deck
Plastic HDPE deck covers.
Attached with swell latches.
52” (132.1cm)
TF Deck
112cm (44”)
SFS Deck
14-gauge,
formed steel
covers with
access holes
to allow
greasing of
outer spindles
without
removal.
Attached with
draw latches.
132cm (52”)
TF Deck
Plastic HDPE
deck covers.
Attached with
swell latches.
2-12Z Master Z400 Service Manual
SPECIFICATIONS
4321
D
C
B
NOTES:
12. MUST NOT SHOW LOSS OF ADHESION OR LEGIBILITY AFTER 15 MINUTES IMMERSION IN GASOLINE.
11. MUST BE PROVIDED BY A SILKSCREEN VENDOR.
10. MUST BE PROVIDED IN ROLL DISPENSE, SHEET FORM OR SPLIT BACKING.
9. MUST HAVE TEDLAR CLEAR OVER LAMINATE FOR ABRASION, GASOLINE RESISTANCE.
8. MUST COMPLY WITH (TURF) ANSI B71.4-1999 WHEN APPLIED TO PAINTED METAL OR POLYETHYLENE FOR A PERIOD OF 24 HOURS.
7. ORIGINAL ARTWORK SHALL BE PROVIDED BY TORO ENGINEERING DEPARTMENT, BLOOMINGTON, MN.
6. DECAL SHALL LOSE NONE OF ITS INITIAL PROPERTIES OR DIMENSIONS WHEN STORED BY TORO FOR ONE YEAR AT TEMPERATURES BELOW 100
o
F AND OUT OF DIRECT SUNLIGHT. DURING STORAGE, ADHESIVE SHALL NOT MIGRATE OR LOSE EFFECTIVENESS.
5. ARTWORK MUST BE CENTERED ON DECAL WITHIN ±.030 UNLESS OTHERWISE SPECIFIED.
4. LETTERING COLOR: TORO CORDLESS BLUE NO. 500-97.
3. LETTERING AND GRAPHICS COLOR: TORO WHITE NO. 500-26.
2. BACKGROUND COLOR: TORO SEMI-GLOSS BLACK NO. 500-41.
1. MATERIAL: AVERY MX3200 WITH 1 MIL. TEDLAR CLEAR OVER
4321
D
C
B
NOTES:
12. MUST NOT SHOW LOSS OF ADHESION OR LEGIBILITY AFTER 15 MINUTES IMMERSION IN GASOLINE.
11. MUST BE PROVIDED BY A SILKSCREEN VENDOR.
10. MUST BE PROVIDED IN ROLL DISPENSE, SHEET FORM OR SPLIT BACKING.
9. MUST HAVE TEDLAR CLEAR OVER LAMINATE FOR ABRASION, GASOLINE RESISTANCE.
8. MUST COMPLY WITH (TURF) ANSI B71.4-1999 WHEN APPLIED TO PAINTED METAL OR POLYETHYLENE FOR A PERIOD OF 24 HOURS.
7. ORIGINAL ARTWORK SHALL BE PROVIDED BY TORO ENGINEERING DEPARTMENT, BLOOMINGTON, MN.
6. DECAL SHALL LOSE NONE OF ITS INITIAL PROPERTIES OR DIMENSIONS WHEN STORED BY TORO FOR ONE YEAR AT TEMPERATURES BELOW 100
o
F AND OUT OF DIRECT SUNLIGHT. DURING STORAGE, ADHESIVE SHALL NOT MIGRATE OR LOSE EFFECTIVENESS.
5. ARTWORK MUST BE CENTERED ON DECAL WITHIN ±.030 UNLESS OTHERWISE SPECIFIED.
4. LETTERING COLOR: TORO CORDLESS BLUE NO. 500-97.
3. LETTERING AND GRAPHICS COLOR: TORO WHITE NO. 500-26.
2. BACKGROUND COLOR: TORO SEMI-GLOSS BLACK NO. 500-41.
Lubrication Fittings
48”/52” (132.1cm/121.9cm)
SFS and TF Decks
7-Gauge Decks
Front Caster Pivots2 removable plugs (1 per side) for periodic lubrication
Front Caster Wheelsn/a2 ttings (1 per side)
Lift Assembly5 ttings
Brake Arms2 ttings (1 per side)
Rear Deck Struts2 ttings (1 per side)
Deck Spindles3 ttings (1 per spindle)
Pump Idler Pivot1 tting
General Specications
Greasing and Lubrication:
Grease:No. 2 general purpose lithium base or molybdenum grease
Where to add grease:See Service Aid and Belt Routing decals below (Fig. 025, 026, 027, 028).
Service Aid Decals
SERVICE AID AND BELT ROUTING
11 12
SERVICE AID AND BELT ROUTING
11 12
1
3
10
9
6
3
5
4
13
4
Fig 025 108-4050
19 hp Kawasaki / 44” SFS Deck
2
Every 10 hours (daily):
3
1. Check engine oil
Every 50 hours:
2. Check hydraulic oil
3. Check tire pressure--13 psi
4. Grease blade spindle bearings
5. Grease front wheel bearings
6. Grease deck lift linkage
9
7. Grease belt idler
Every 250 hours:
78
8. Inspect belt and tension
9. Grease brake linkage
10. Grease belt idler
6
Every 1000 hours (yearly):
11. Inspect covers and
safety systems
12. Inspect fasteners and hoses
13. Grease front caster pivot
3
5
See operator's manual for
additional details.
13
108-4050
Fig 026 107-1687A
19 hp Kawasaki / 52” 7-Gauge Deck
18 hp Kohler / 48” 7-Gauge Deck
19 hp Kawasaki / 48” TF Deck
20 hp Kohler / 52” TF Deck
19 hp Kawasaki / 52” TF Deck
23 hp Kawasaki / 52” TF Deck
23 hp Kawasaki / 48” TF Deck
1
3
10
8
9
6
3
5
4
13
13
2
Every 10 hours (daily):
3
1. Check engine oil
Every 50 hours:
2. Check hydraulic oil
3. Check tire pressure--13 psi
4. Grease blade spindle bearings
5. Grease front wheel bearings
6. Grease deck lift linkage
8
7. Grease belt idler
7
Every 250 hours:
8. Grease brake linkage
6
9. Inspect belt and tension
10. Grease belt idler
Every 1000 hours (yearly):
11. Inspect covers and
safety systems
12. Inspect fasteners and hoses
3
13. Grease front caster pivot
5
See operator's manual for
additional details.
107-1687
2
2-13Z Master Z400 Service Manual
SPECIFICATIONS
4321
D
C
B
NOTES:
12. MUST NOT SHOW LOSS OF ADHESION OR LEGIBILITY AFTER 15 MINUTES IMMERSION IN GASOLINE.
11. MUST BE PROVIDED BY A SILKSCREEN VENDOR.
10. MUST BE PROVIDED IN ROLL DISPENSE, SHEET FORM OR SPLIT BACKING.
9. MUST HAVE TEDLAR CLEAR OVER LAMINATE FOR ABRASION, GASOLINE RESISTANCE.
8. MUST COMPLY WITH (TURF) ANSI B71.4-1999 WHEN APPLIED TO PAINTED METAL OR POLYETHYLENE FOR A PERIOD OF 24 HOURS.
7. ORIGINAL ARTWORK SHALL BE PROVIDED BY TORO ENGINEERING DEPARTMENT, BLOOMINGTON, MN.
6. DECAL SHALL LOSE NONE OF ITS INITIAL PROPERTIES OR DIMENSIONS WHEN STORED BY TORO FOR ONE YEAR AT TEMPERATURES BELOW 100
o
F AND OUT OF DIRECT SUNLIGHT. DURING STORAGE, ADHESIVE SHALL NOT MIGRATE OR LOSE EFFECTIVENESS.
5. ARTWORK MUST BE CENTERED ON DECAL WITHIN ±.030 UNLESS OTHERWISE SPECIFIED.
4. LETTERING COLOR: TORO CORDLESS BLUE NO. 500-97.
3. LETTERING AND GRAPHICS COLOR: TORO WHITE NO. 500-26.
2. BACKGROUND COLOR: TORO SEMI-GLOSS BLACK NO. 500-41.
1. MATERIAL: AVERY MX3200 WITH 1 MIL. TEDLAR CLEAR OVER LAMINATE.
PRODUCT: Z 100 SERIES CE
4321
D
C
B
NOTES:
12. MUST NOT SHOW LOSS OF ADHESION OR LEGIBILITY AFTER 15 MINUTES IMMERSION IN GASOLINE.
11. MUST BE PROVIDED BY A SILKSCREEN VENDOR.
10. MUST BE PROVIDED IN ROLL DISPENSE, SHEET FORM OR SPLIT BACKING.
9. MUST HAVE TEDLAR CLEAR OVER LAMINATE FOR ABRASION, GASOLINE RESISTANCE.
8. MUST COMPLY WITH (TURF) ANSI B71.4-1999 WHEN APPLIED TO PAINTED METAL OR POLYETHYLENE FOR A PERIOD OF 24 HOURS.
7. ORIGINAL ARTWORK SHALL BE PROVIDED BY TORO ENGINEERING DEPARTMENT, BLOOMINGTON, MN.
6. DECAL SHALL LOSE NONE OF ITS INITIAL PROPERTIES OR DIMENSIONS WHEN STORED BY TORO FOR ONE YEAR AT TEMPERATURES BELOW 100
o
F AND OUT OF DIRECT SUNLIGHT. DURING STORAGE, ADHESIVE SHALL NOT MIGRATE OR LOSE EFFECTIVENESS.
5. ARTWORK MUST BE CENTERED ON DECAL WITHIN ±.030 UNLESS OTHERWISE SPECIFIED.
4. LETTERING COLOR: TORO CORDLESS BLUE NO. 500-97.
3. LETTERING AND GRAPHICS COLOR: TORO WHITE NO. 500-26.
2. BACKGROUND COLOR: TORO SEMI-GLOSS BLACK NO. 500-41.
2
11 12
1
3
10
8
9
6
3
5
4
13
2
10
1.
3
50
2.
3.
4.
5.
8
6.
7
5
13
7.
250
6
8.
9.
10.
1000
11.
3
12.
13.
107-1686
Fig 027 107-1686A
23 hp Kawasaki / 132cm (52” TF Deck)
Fig 029 g. 55 m-5615
1. Cap 3. Cold uid level - full
2. Bafe 4. Hot uid level - full
11 12
1
3
10
9
6
3
5
4
13
4
Fig 028 108-4051
19 hp Kawasaki / 112cm (44” SFS Deck)
2-14Z Master Z400 Service Manual
2
10
1.
3
50
2.
3.
4.
9
78
5
13
5.
6.
7.
250
6
8.
9.
10.
1000
11.
3
12.
13.
108-4051
SPECIFICATIONS
Hydraulic System Oil Capacity:2.1 quarts (2.0 liters)
Fluid Level:Check the uid level while the uid is warm. The uid should be between cold
and hot.
Note: The uid level should be to the top of the hot level of the bafe,
when the uid is hot (Fig. 000 above).
Model and Serial Number
Location
The unit model and serial number plate is located on the right hand side of the unit,
below the right side motion control lever (Fig. 000).
Fig 030 PICT-0046
Engine Model and Serial Number
Identication:
Hydrostatic Pumps Model and Serial
Number:
Consult the appropriate engine manufacture’s service literature for the
location and translation of the engine model and serial number information.
The label (Fig. 000), can be located on the pump housing. It identies the
model and conguration of the BDP pump.
2
Fig 031 conguration
Available Service Manuals / Service Aids
Hydrostatic Pumps:Hydro-Gear BDP-10A/16A/21L – Service and Repair Manual
Form # 492-4789
Wheel Motors:Parker/Ross Wheel Motor Service Manual
Form # 492-4753
Hydraulic Troubleshooting:Interactive hydraulic troubleshooting and failure analysis on compact disk
Form #492-4777
Electrical Troubleshooting:Interactive electrical troubleshooting and wiring diagrams on compact disk
Form #492-9143
2-15Z Master Z400 Service Manual
SPECIFICATIONS
2
Torque Specifications
Recommended fastener torque values are listed in the
following tables. For critical applications, as
determined by Toro, either the recommended torque or
a torque that is unique to the application is clearly
identified and specified in the service manual.
These torque specifications for the installation and
tightening of fasteners shall apply to all fasteners which
do not have a specific requirement identified in the
service manual. The following factors shall be
considered when applying torque: cleanliness of the
fastener, use of a thread sealant (Loctite), degree of
lubrication on the fastener, presence of a prevailing
torque feature, hardness of the surface underneath of
the fastener’s head, or similar condition which affects
the installation.
As noted in the following tables, torque values should
be reduced by 25% for lubricated fasteners to
achieve the similar stress as a dry fastener. Torque
values may also have to be reduced when the fastener
is threaded into aluminum or brass. The specific
torque value should be determined based on the
aluminum or brass material strength, fastener size,
length of thread engagement, etc.
Fastener Identification
Inch Series Bolts and Screws
(A) Grade 1
(B) Grade 5
Figure A
(C) Grade 8
The standard method of verifying torque shall be
performed by marking a line on the fastener (head or
nut) and mating part, then back off fastener 1/4 of a
turn. Measure the torque required to tighten the
fastener until the lines match up.
Figure B
Metric Bolts and Screws
(A) Class 8.8(B) Class 10.9
2-16Z Master Z400 Service Manual
SPECIFICATIONS
SAE Grade 8 Bolts, Screws,
Studs, & Sems with Regular
2
Standard Torque for Dry, Zinc Plated, and Steel Fasteners (Inch Series)
SAE Grade 1 Bolts, Screws,
Studs, & Sems with Regular
Height Nuts (SAE J995
Grade 2 or Stronger Nuts)
SAE Grade 5 Bolts, Screws,
Studs, & Sems with Regular
Height Nuts (SAE J995
Grade 2 or Stronger Nuts)
15 ± 2170 ± 2023 ± 2260 ± 20
29 ± 3330 ± 3041 ± 4460 ± 45
42 ± 4475 ± 4560 ± 6674 ± 70
Height Nuts (SAE J995
Grade 2 or Stronger Nuts)
2
Note: Reduce torque values listed in the table above
by 25% for lubricated fasteners. Lubricated fasteners
are defined as threads coated with a lubricant such as
oil, graphite, or thread sealant such as Loctite.
Note: Torque values may have to be reduced when
installing fasteners into threaded aluminum or brass.
The specific torque value should be determined based
on the fastener size, the aluminum or base material
strength, length of thread engagement, etc.
Note: The nominal torque values listed above for
Grade 5 and 8 fasteners are based on 75% of the
minimum proof load specified in SAE J429. The
tolerance is approximately
value. Thin height nuts include jam nuts.
± 10% of the nominal torque
2-17Z Master Z400 Service Manual
SPECIFICATIONS
Standard Torque for Dry, Zinc, and Steel Fasteners (Metric Fasteners)
Note: Reduce torque values listed in the table above
by 25% for lubricated fasteners. Lubricated fasteners
are defined as threads coated with a lubricant such as
oil, graphite, or thread sealant such as Loctite.
Note: Torque values may have to be reduced when
installing fasteners into threaded aluminum or brass.
The specific torque value should be determined based
on the fastener size, the aluminum or base material
strength, length of thread engagement, etc.
Regular Height Nuts
(Class 8 or Strong Nuts)
Note: The nominal torque values listed above are
based on 75% of the minimum proof load specified in
SAE J1199. The tolerance is approximately
the nominal torque value. Thin height nuts include jam nuts.
Class 10.9 Bolts, Screws, and Studs with
Regular Height Nuts (
Class 10 or Strong Nuts)
± 10% of
2-18Z Master Z400 Service Manual
Other Torque Specifications
SPECIFICATIONS
SAE Grade 8 Steel Set Screws
Recommended Torque
Thread Size
Square HeadHex Socket
1/4 - 20 UNC140 ± 20 in-lb73 ± 12 in-lb
5/16 - 18 UNC215 ± 35 in-lb145 ± 20 in-lb
3/8 - 16 UNC35 ± 10 ft-lb18 ± 3 ft-lb
1/2 - 13 UNC75 ± 15 ft-lb50 ± 10 ft-lb
Thread Cutting Screws
(Zinc Plated Steel)
Type 1, Type 23, or Type F
Thread SizeBaseline Torque*
No. 6 - 32 UNC20 ± 5 in-lb
Wheel Bolts and Lug Nuts
Thread SizeRecommended Torque**
7/16 - 20 UNF
Grade 5
1/2 - 20 UNF
Grade 5
M12 X 1.25
Class 8.8
M12 X 1.5
Class 8.8
** For steel wheels and non-lubricated fasteners.
Thread Cutting Screws
Thread
Size
No. 6182020 ± 5 in-lb
Threads per Inch
Type AType B
65 ± 10 ft-lb88 ± 14 N-m
80 ± 10 ft-lb108 ± 14 N-m
80 ± 10 ft-lb108 ± 14 N-m
80 ± 10 ft-lb108 ± 14 N-m
(Zinc Plated Steel)
Baseline Torque*
2
No. 8 - 32 UNC30 ± 5 in-lb
No.10 - 24 UNC38 ± 7 in-lb
1/4 - 20 UNC85 ± 15 in-lb
5/16 - 18 UNC110 ± 20 in-lb
3/8 - 16 UNC200 ± 100 in-lb
Conversion Factors
in-lb X 11.2985 - N-cm
ft-lb X 1.3558 = N-m
No. 8151830 ± 5 in-lb
No. 10121638 ± 7 in-lb
No. 12111485 ± 15 in-lb
* Hole size, material strength, material thickness and
finish must be considered when determining specific
torque values. All torque values are based on nonlubricated fasteners.