Toro Lawn-Boy TimeCutter Z User manual

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ABOUT THIS MANUAL
This service manual was written expressly for Toro and Lawn-Boy 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.
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service and repair instructions.
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The hydrostatic transaxle is a sophisticated piece of machinery. Maintain strict cleanliness control during all stages of
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other contamination can severely damage the system.
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comments regarding this manual, please contact us at the following address:
The Toro Company
Residential and Landscape Contractor Service Training Department
8111 Lyndale Avenue South
Bloomington, MN 55420
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Copyright© All Rights Reserved
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ABOUT THIS MANUAL
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TABLE OF CONTENTS
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Safety Information
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6SHFL¿FDWLRQV
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*HQHUDO6SHFL¿FDWLRQV..................................................................................................................
7UDFWLRQ6\VWHP............................................................................................................................
*URXQG6SHHG6SHFL¿FDWLRQV.......................................................................................................
7LUH6SHFL¿FDWLRQV ........................................................................................................................
0RZHU'HFN6SHFL¿FDWLRQV ..........................................................................................................
Dimensions & Weight...................................................................................................................
Dimensions & Weight cont. ..........................................................................................................
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7RUTXH6SHFL¿FDWLRQV ...................................................................................................................
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6WDQGDUG7RUTXHIRU'U\=LQFDQG6WHHO)DVWHQHUV0HWULF)DVWHQHUV ....................................
2WKHU7RUTXH6SHFL¿FDWLRQV .......................................................................................................
(TXLYDOHQWV&RQYHUVLRQV.........................................................................................................
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86WR0HWULF&RQYHUVLRQV.........................................................................................................
Chassis
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*UHDVH/XEULFDWLRQ......................................................................................................................
Front Castor Fork Replacement.....................................................................................................
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6W\OH%)URQW$[OH$VVHPEO\&DVWHU)RUN5HPRYDO...............................................................
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Caster Wheel Assembly Removal............................................................................................
&DVWRU:KHHO$VVHPEO\,QVWDOODWLRQ.........................................................................................
Front Axle Assembly Removal .................................................................................................
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Fuel Tank Replacement................................................................................................................
Fuel Tank Removal ................................................................................................................
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6HDW3LYRW&RQWURO$VVHPEO\5HSODFHPHQW ..................................................................................
6HDW3LYRW&RQWURO$VVHPEO\5HPRYDO ..................................................................................
6HDW3LYRW&RQWURO$VVHPEO\,QVWDOODWLRQ ...............................................................................
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'HFN/LIW6HDW3RGV%UDFNHW5HPRYDO................................................................................
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Arm-Lift, Rear, Replacement........................................................................................................
Arm-Lift, Rear, Removal.........................................................................................................
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Rear Bumper Replacement..........................................................................................................
Rear Bumper Removal ..........................................................................................................
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TABLE OF CONTENTS
ii   7LPH&XWWHU=3UHFLVLRQ=6HUYLFH0DQXDO
Engine
Engine Replacement....................................................................................................................
Engine Removal.....................................................................................................................
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(QJLQH0XIÀHU5HSODFHPHQW ......................................................................................................
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Hydrostatic Drive System
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'ULYH%HOW,QVWDOODWLRQ .............................................................................................................
Transaxle Replacement................................................................................................................
Transaxle Removal................................................................................................................
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Actuator Arm Replacement.........................................................................................................
Actuator Arm Removal.........................................................................................................
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Activator Arm Assembly Replacement........................................................................................
Activator Arm Assembly Removal........................................................................................
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1HXWUDO$GMXVWPHQW .....................................................................................................................
7UDFNLQJ$GMXVWPHQW ...................................................................................................................
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Mower Deck
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,GOHU$UP5HSODFHPHQW ...................................................................................................................
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,GOHU$UP,QVWDOODWLRQ ..............................................................................................................
)L[HG)ODW,GOHU3XOOH\5HSODFHPHQW.............................................................................................
)L[HG)ODW,GOHU3XOOH\5HPRYDO .............................................................................................
)L[HG)ODW,GOHU3XOOH\,QVWDOODWLRQ ..........................................................................................
Mower Deck Replacement ...........................................................................................................
Mower Deck Removal............................................................................................................
0RZHU'HFN,QVWDOODWLRQ.........................................................................................................
Leveling the Mower Deck.............................................................................................................
6LGHWR6LGH/HYHOLQJ.............................................................................................................
$GMXVWLQJWKH)URQWWR5HDU%ODGH6ORSH ...............................................................................
Mower Belt Maintenance..............................................................................................................
Mower Belt Routing................................................................................................................
,QVSHFWLQJWKH%HOWV................................................................................................................
Mower Belt Replacement.......................................................................................................
Checking for Bent Blades.............................................................................................................
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TABLE OF CONTENTS
iii7LPH&XWWHU=3UHFLVLRQ=6HUYLFH0DQXDO
Electrical
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5HOD\.LOO5HOD\............................................................................................................................
3XUSRVH....................................................................................................................................
Location ...................................................................................................................................
+RZ,W:RUNV............................................................................................................................
Testing......................................................................................................................................
6ROHQRLG..........................................................................................................................................
3XUSRVH....................................................................................................................................
Location ...................................................................................................................................
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Testing......................................................................................................................................
,JQLWLRQ6ZLWFK ................................................................................................................................
3XUSRVH....................................................................................................................................
Location ...................................................................................................................................
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Testing......................................................................................................................................
3726ZLWFK.....................................................................................................................................
3XUSRVH....................................................................................................................................
Location ...................................................................................................................................
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Testing......................................................................................................................................
(OHFWULF372&OXWFK......................................................................................................................
3XUSRVH....................................................................................................................................
Location ...................................................................................................................................
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Testing......................................................................................................................................
Coil Resistance Measurement.................................................................................................
Measuring Clutch Current Draw...............................................................................................
3DUN%UDNH6ZLWFK ..........................................................................................................................
3XUSRVH....................................................................................................................................
Location ...................................................................................................................................
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Testing......................................................................................................................................
6ZLWFK6HDW..................................................................................................................................
3XUSRVH..................................................................................................................................
Location .................................................................................................................................
+RZ,W:RUNV..........................................................................................................................
Testing....................................................................................................................................
FlyBack Diode ..............................................................................................................................
3XUSRVH..................................................................................................................................
Location .................................................................................................................................
+RZ,W:RUNV..........................................................................................................................
Testing....................................................................................................................................
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7RUR7LPH&XWWHU=0RGHOV6FKHPDWLF .................................................................................
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TABLE OF CONTENTS
iv   7LPH&XWWHU=3UHFLVLRQ=6HUYLFH0DQXDO
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SAFETY INFORMATION
1-1TimeCutter® Z/Precision® Z Service Manual
1
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.
This manual is intended as a service and repair manual
only. The safety instructions provided herein are for
troubleshooting, service, and repair of the TimeCutter® Z
and the Precision® Z zero radius turn mowers.
General Information
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…
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…
'RQRWWRXFKWKHHQJLQHPXIÀHURURWKHUFRPSRQHQWV
which may increase in temperature during operation,
while the unit is running or shortly after it has been
running.
$YRLG¿UHVDQGH[SORVLRQV«
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…
1HYHURSHUDWHDQHQJLQHLQDFRQ¿QHGDUHDZLWKRXW
proper ventilation.
Avoid injury from batteries…
Battery acid is poisonous and can cause burns. Avoid
contact with skin, eyes and clothing. Battery gases can
H[SORGH.HHSFLJDUHWWHVVSDUNVDQGÀDPHVDZD\IURP
the battery.
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.
$YRLGPRGL¿FDWLRQV«
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.
The TimeCutter Z and the Precision Z operator’s
manuals contain safety information and operating tips
for safe operating practices. Operator’s manuals are
available online through your Toro parts source or:
The Toro Company
Publications Department
8111 Lyndale Avenue South
Bloomington, MN 55420
!

SAFETY INFORMATION
1-2 TimeCutter® Z/Precision® Z Service Manual
1
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SPECIFICATIONS
2-1TimeCutter® Z/Precision® Z Service Manual
2
Z4200 Kohler, Overhead Valve, Twin Cam, 19.0 hp (14.2kW) @ 3600 RPM
High Idle: 3300 + 100 RPM
Z4200 (CE) Kohler, Overhead Valve, Twin Cam, 19.0 hp (14.2kW) @ 3600 RPM
High Idle: 2650 + 100 RPM
Z4220 Kohler, Overhead Valve, Twin Cam, 21.0 hp (15.7kW) @ 3600 RPM
High Idle: 3300 + 100 RPM
Z4202 (CE) Kohler, Overhead Valve, Twin Cam, 20.0 hp (14.9kW) @ 3600 RPM
High Idle: 2400 +100/-0 RPM
Z5000 Kohler, Overhead Valve, Twin Cam, 21.0 hp (15.7kW) @ 3600 RPM
High Idle: 3300 + 100 RPM
Z5000 (CE) Kohler, Overhead Valve, Twin Cam, 21.0 hp (15.7kW) @ 3600 RPM
High Idle: 2900 + 100 RPM
Z5020 Kohler, Overhead Valve, Twin Cam, 23.0 hp (17.2kW) @ 3600 RPM
High Idle: 3300 + 100 RPM
Z5020 (CE) Kohler, Overhead Valve, Twin Cam, 23.0 hp (17.2kW) @ 3600 RPM
High Idle: 2900 +0/-200 RPM
Z5030 Kohler, Overhead Valve, Twin Cam, 23.0 hp (17.2kW) @ 3600 RPM
High Idle: 3300 + 100 RPM
Z5040 Kawasaki, Overhead Valve, 21.0 hp (15.7kW) @ 3600 RPM
High Idle: 3450 + 100 RPM
Z5060 Kohler, Overhead Valve, Twin Cam, 25.0 hp (18.6kW) @ 3600 RPM
High Idle: 3300 + 100 RPM
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SPECIFICATIONS
2-2 TimeCutter® Z/Precision® Z Service Manual
2
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7UDFWLRQ6\VWHP
&RQVWUXFWLRQ Frame: drawn 11 gauge steel
)XHO6\VWHP 6LQJOHIXHOWDQNJDOORQ/FDSDFLW\IXHO¿OWHUUHSODFHDEOHLQOLQHW\SHYHQWHGIXHOFDS
$WWDFKPHQW'ULYH Electric Clutch
6WHHULQJ Levers: Dual wrap-around levers control hydraulic pump
Dampening: Dual hydraulic dampeners
Turning Radius: Zero Radius Turn (ZRT)
,QWHUORFNV Seat: Operator presence switch
Control Lever/Brake: Dual position switch
Power Take Off: Position switch
(OHFWULFDO6\VWHP Battery Voltage: 12 volt negative ground
%DWWHU\7\SH%&,*URXS8ZHWFKDUJHEDWWHU\
)XVHVDPSEODGHW\SHPDLQDPSEODGHW\SHFKDUJHV\VWHP
7UDQVD[OH Twin Hydro-Gear EZT Hydrostatic Transaxles
7UDQVD[OH'ULYH Belt drive with self-tensioning system

SPECIFICATIONS
2-3TimeCutter® Z/Precision® Z Service Manual
2
*URXQG6SHHG6SHFL¿FDWLRQV
7LUH6SHFL¿FDWLRQV
0RGHO *URXQG6SHHG
Z4200 ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.5 mph (5.6km/hr) reverse
Z4200 (CE) ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 2.8 mph (4.5km/hr) reverse
Z4220 ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.5 mph (5.6km/hr) reverse
Z4202 (CE) ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 2.8 mph (4.5km/hr) reverse
Z5000 ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.5 mph (5.6km/hr) reverse
Z5000 (CE) ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.0 mph (4.9km/hr) reverse
Z5020 ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.5 mph (5.6km/hr) reverse
Z5020 (CE) ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.0 mph (4.8km/hr) reverse
Z5030 ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.5 mph (5.6km/hr) reverse
Z5040 ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.7 mph (6.0km/hr) reverse
Z5060 ,Q¿QLWH WRPSKNPKUIRUZDUG
0 to 3.5 mph (5.6km/hr) reverse
´FP0RZHU'HFN0RGHOV ´FP0RZHU'HFN0RGHOV
5HDUGULYHWLUHV 18x7.5-8, 2 ply rated 18x9.5-8, 2 ply rated
)URQWFDVWRUWLUHV 410/350 x 4 with “saw tooth” tread 410/350 x 4 with “smooth” tread
7LUHSUHVVXUH Rear: 13 psi (90kPa)
Front: 35 psi (241kPa) Rear: 13 psi (90kPa) Front: 20 psi (137.9kPa)

SPECIFICATIONS
2-4 TimeCutter® Z/Precision® Z Service Manual
2
0RZHU'HFN6SHFL¿FDWLRQV
´FP0RZHU'HFN0RGHOV ´FP0RZHU'HFN0RGHOV
0RZHU'HFN 5LJKWVLGHGLVFKDUJHEODGHPLGPRXQWHG
rotary. Drawn 13 gauge steel deck with
ZHOGHGPRXQWLQJEUDFNHWV)UDPHVXSSRUWHG
EODGHPLGPRXQWHGURWDU\'UDZQJDXJH
VWHHOGHFNZLWKZHOGHGPRXQWLQJEUDFNHWV
Frame supported.
&(PRGHO 5HF\FOHUFRYHUEDIÀHDQGNLFNHUVLQVWDOOHG
'HÀHFWRU 3LYRWLQJGHÀHFWRUVSULQJORDGHG
$QWLVFDOS5ROOHUV Left and right front mounted,
Two height positions Left, center and right front mounted, Four height positions
+HLJKWRI&XW Adjusts from 1.5” to 4.5” (7 positions)
%ODGH7LS6SHHG 17,290 ft (5,270m)/min @ 3300 RPM nominal
17,810 ft (5,428m)/min @ 3400 RPM max 17,730 ft (5,404m)/min @ 3300 RPM nominal 18,330 ft (5,587m)/min @ 3400 RPM max

SPECIFICATIONS
2-5TimeCutter® Z/Precision® Z Service Manual
2
'LPHQVLRQV:HLJKW
0RGHO :KHHO%DVH1:LGWK22YHUDOO
:LGWK3
2YHUDOO
/HQJWK
2YHUDOO
+HLJKW
Z4200 48.1”
(122.2cm) 40.5” (102.9cm) 53.75” (136.5cm) 73.1” (185.7cm) 37.25” (94.6cm)
Z4200 (CE) 48.1”
(122.2cm) 40.5” (102.9cm) 53.75” (136.5cm) 73.1” (185.7cm) 37.25” (94.6cm)
Z4220 48.1”
(122.2cm) 40.5” (102.9cm) 53.75” (136.5cm) 73.1” (185.7cm) 37.25” (94.6cm)
Z4202 (CE) 48.1”
(122.2cm) 40.5” (102.9cm) 53.75” (136.5cm) 73.1” (185.7cm) 37.25” (94.6cm)
Z5000 48.1”
(122.2cm) 43.5” (110.5cm) 63” (160cm) 73.1” (185.7cm) 40.25” (102.2cm)
Z5000 (CE) 48.1”
(122.2cm) 43.5” (110.5cm) 63” (160cm) 73.1” (185.7cm) 40.25” (102.2cm)
Z5020 48.1”
(122.2cm) 43.5” (110.5cm) 63” (160cm) 73.1” (185.7cm) 40.25” (102.2cm)
Z5020 (CE) 48.1”
(122.2cm) 43.5” (110.5cm) 63” (160cm) 73.1” (185.7cm) 40.25” (102.2cm)
Z5030 48.1”
(122.2cm) 43.5” (110.5cm) 63” (160cm) 73.1” (185.7cm) 40.25” (102.2cm)
Z5040 48.1”
(122.2cm) 43.5” (110.5cm) 63” (160cm) 73.1” (185.7cm) 40.25”
(102.2cm)
Z5060 48.1”
(122.2cm) 43.5” (110.5cm) 63” (160cm) 73.1” (185.7cm) 40.25” (102.2cm)
1 - center of front tire to center of drive tires
2 - outside rear tires
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SPECIFICATIONS
2-6 TimeCutter® Z/Precision® Z Service Manual
2
'LPHQVLRQV:HLJKWFRQW
0RGHO 7UDFN:LGWK47UDFN:LGWK5'HFN:LGWK :HLJKW
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Z4200 32.9”
(83.6cm) 29.5” (74.9cm) 53.75” (226.8cm) OEV (226.8kg)
Z4200 (CE) 32.9”
(83.6cm) 29.5” (74.9cm) 53.75” (226.8cm) OEV (231kg)
Z4220 32.9”
(83.6cm) 29.5” (74.9cm) 53.75” (226.8cm) OEV (226.8kg)
Z4202 (CE) 32.9”
(83.6cm) 29.5” (74.9cm) 53.75” (226.8cm) OEV (231kg)
Z5000 34.6”
(87.9cm) 29.5” (74.9cm) 63” (160cm) OEV (250.4kg)
Z5000 (CE) 34.6”
(87.9cm) 29.5” (74.9cm) 63” (160cm) OEV (259.5kg)
Z5020 34.6”
(87.9cm) 29.5” (74.9cm) 63” (160cm) OEV (256.3kg)
Z5020 (CE) 34.6”
(87.9cm) 29.5” (74.9cm) 63” (160cm) OEV (265.4kg)
Z5030 34.6”
(87.9cm) 29.5” (74.9cm) 63” (160cm) OEV (250.4kg)
Z5040 34.6”
(87.9cm) 29.5” (74.9cm) 63” (160cm) OEV (256.3kg)
Z5060 34.6”
(87.9cm) 29.5” (74.9cm) 63” (160cm) OEV (256.3kg)
4 - center to center of rear tires
5 - center to center of castor tires

SPECIFICATIONS
2-7TimeCutter® Z/Precision® Z Service Manual
2
+\GURVWDWLF7UDQVD[OH6SHFL¿FDWLRQV
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Oil Capacity 1.6 to 1.7 qt. (1.5 to 1.6 liters)
Oil Level 7KHWUDQVD[OHLVDVHDOHGV\VWHPDQGGRHVQRWUHTXLUHSHULRGLFFKHFNLQJ&KHFNRLODWWKHRLO¿OO
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SPECIFICATIONS
2-8 TimeCutter® Z/Precision® Z Service Manual
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.
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.
Fastener Identification
Figure A
Figure B
Inch Series Bolts and Screws
(A) Grade 1
(B) Grade 5 (C) Grade 8
Metric Bolts and Screws
(A) Class 8.8 (B) Class 10.9
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SPECIFICATIONS
2-9TimeCutter® Z/Precision® Z Service Manual
2
Standard Torque for Dry, Zinc Plated, and Steel Fasteners (Inch Series)
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 ± 10% of the nominal torque
value. Thin height nuts include jam nuts.
Thread Size
Grade 1, 5, &
8 with Thin
Height Nuts
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)
SAE Grade 8 Bolts, Screws,
Studs, & Sems with Regular
Height Nuts (SAE J995
Grade 2 or Stronger Nuts)
In-lb In-lb N-cm In-lb N-cm In-lb N-cm
# 6 - 32 UNC 10 ± 2 13 ± 2 147 ± 23 15 ± 2 170 ± 20 23 ± 2 260 ± 20
# 6 - 40 UNF 17 ± 2 190 ± 20 25 ± 2 280 ± 20
# 8 - 32 UNC 13 ± 2 25 ± 5 282 ± 30 29 ± 3 330 ± 30 41 ± 4 460 ± 45
# 8 - 36 UNF 31 ± 3 350 ± 30 43 ± 4 31 ± 3
# 10 - 24 UNC 18 ± 2 30 ± 5 339 ± 56 42 ± 4 475 ± 45 60 ± 6 674 ± 70
#10 - 32 UNF 48 ± 4 540 ± 45 68 ± 6 765 ± 70
1/4 - 20 UNC 48 ± 7 53 ± 7 599 ± 79 100 ± 10 1125 ± 100 140 ± 15 1580 ± 170
1/4 - 28 UNF 53 ± 7 65 ± 10 734 ± 113 115 ± 10 1300 ± 100 160 ± 15 1800 ± 170
5/16 - 18 UNC 115 ± 15 105 ± 17 1186 ± 169 200 ± 25 2250 ± 280 300 ± 30 3390 ± 340
5/16 - 24 UNF 138 ± 17 128 ± 17 1446 ± 192 225 ± 25 2540 ± 280 325 ± 30 3670 ± 340
ft-lb ft-lb N-m ft-lb N-m ft-lb N-m
3/8 - 16 UNC 16 ± 2 16 ± 2 22 ± 3 30 ± 3 41 ± 4 43 ± 4 58 ± 5
3/8 - 24 UNF 17 ± 2 18 ± 2 24 ± 3 35 ± 3 47 ± 4 50 ± 4 68 ± 5
7/16 - 14 UNC 27 ± 3 27 ± 3 37 ± 4 50 ± 5 68 ± 7 70 ± 7 68 ± 9
7/16 - 20 UNF 29 ± 3 29 ± 3 39 ± 4 55 ± 5 75 ± 7 77 ± 7 104 ± 9
1/2 - 13 UNC 30 ± 3 48 ± 7 65 ± 9 75 ± 8 102 ± 11 105 ± 10 142 ± 14
1/2 - 20 UNF 32 ± 3 53 ± 7 72 ± 9 85 ± 8 115 ± 11 120 ± 10 163 ± 14
5/8 - 11 UNC 65 ± 10 88 ± 12 119 ± 16 150 ± 15 203 ± 20 210 ± 20 285 ± 27
5/8 - 18 UNF 75 ± 10 95 ± 15 129 ± 20 170 ± 15 230 ± 20 240 ± 20 325 ± 27
3/4 - 10 UNC 93 ± 12 140 ± 20 190 ± 27 265 ± 25 359 ± 34 374 ± 35 508 ± 47
3/4 - 16 UNF 115 ± 15 165 ± 25 224 ± 34 300 ± 25 407 ± 34 420 ± 35 569 ± 47
7/8 - 9 UNC 140 ± 20 225 ± 25 305 ± 34 430 ± 45 583 ± 61 600 ± 60 813 ± 81
7/8 - 14 UNF 155 ± 25 260 ± 30 353 ± 41 475 ± 45 644 ± 61 660 ± 60 895 ± 81
2
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SPECIFICATIONS
2-10 TimeCutter® Z/Precision® Z Service Manual
2
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.
Note: The nominal torque values listed above are
based on 75% of the minimum proof load specified in
SAE J1199. The tolerance is approximately ± 10% of
the nominal torque value. Thin height nuts include jam nuts.
Thread Size
Class 8.8 Bolts, Screws, and Studs with
Regular Height Nuts
(Class 8 or Strong Nuts)
Class 10.9 Bolts, Screws, and Studs with
Regular Height Nuts (
Class 10 or Strong Nuts)
M5 X 0.8 57 ± 5 in-lb 640 ± 60 N-cm 78 ± 7 in-lb 885 ± 80 N-cm
M6 X 1.0 96 ± 9 in-lb 1018 ± 100 N-cm 133 ± 13 in-lb 1500 ± 150 N-cm
M8 X 1.25 19 ± 2 ft-lb 26 ± 3 N-m 27 ± 2 ft-lb 36 ± 3 N-m
M10 X 1.5 38 ± 4 ft-lb 52 ± 5 N-m 53 ± 5 ft-lb 72 ± 7 N-m
M12 X 1.75 66 ± 7 ft-lb 90 ± 10 N-m 92 ± 9 ft-lb 125 ± 12 N-m
M16 X 2.0 166 ± 15 ft-lb 225 ± 20 N-m 229 ± 22 ft-lb 310 ± 30 N-m
M20 X 2.5 325 ± 33 ft-lb 440 ± 45 N-m 450 ± 37 ft-lb 610 ± 50 N-m
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SPECIFICATIONS
2-11TimeCutter® Z/Precision® Z Service Manual
2
Other Torque Specifications
SAE Grade 8 Steel Set Screws
Thread Cutting Screws
(Zinc Plated Steel)
Conversion Factors
in-lb X 11.2985 - N-cm
ft-lb X 1.3558 = N-m
Wheel Bolts and Lug Nuts
** For steel wheels and non-lubricated fasteners.
Thread Cutting Screws
(Zinc Plated Steel)
* Hole size, material strength, material thickness and
finish must be considered when determining specific
torque values. All torque values are based on non-
lubricated fasteners.
N-cm X - 0.08851 = in-lb
N-cm X 0.73776 - ft-lb
Thread Size
Recommended Torque
Square Head Hex Socket
1/4 - 20 UNC 140 ± 20 in-lb 73 ± 12 in-lb
5/16 - 18 UNC 215 ± 35 in-lb 145 ± 20 in-lb
3/8 - 16 UNC 35 ± 10 ft-lb 18 ± 3 ft-lb
1/2 - 13 UNC 75 ± 15 ft-lb 50 ± 10 ft-lb
Type 1, Type 23, or Type F
Thread Size Baseline Torque*
No. 6 - 32 UNC 20 ± 5 in-lb
No. 8 - 32 UNC 30 ± 5 in-lb
No.10 - 24 UNC 38 ± 7 in-lb
1/4 - 20 UNC 85 ± 15 in-lb
5/16 - 18 UNC 110 ± 20 in-lb
3/8 - 16 UNC 200 ± 100 in-lb
Thread Size Recommended Torque**
7/16 - 20 UNF
Grade 5 65 ± 10 ft-lb 88 ± 14 N-m
1/2 - 20 UNF
Grade 5 80 ± 10 ft-lb 108 ± 14 N-m
M12 X 1.25
Class 8.8 80 ± 10 ft-lb 108 ± 14 N-m
M12 X 1.5
Class 8.8 80 ± 10 ft-lb 108 ± 14 N-m
Thread
Size
Threads per Inch
Baseline Torque*
Type A Type B
No. 6 18 20 20 ± 5 in-lb
No. 8 15 18 30 ± 5 in-lb
No. 10 12 16 38 ± 7 in-lb
No. 12 11 14 85 ± 15 in-lb
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