Kyoeisha Baroness LM531 User manual

5-Unit Reel Mower
Service Manual
Serial No. LM531：10001-
Ver.1.0
Technical docuentation No.TD-LM531-008-02

This manual describes about the procedures of maintenance and malfunction diagnosis etc. of this product.
Items of description are categorized per system for representative maintenance contents.
We hope you will use the product safely, and take advantage of its best performance.
Kyoeisha Co., Ltd.
Warning Symbols
This manual uses the following warning symbols for handling precautions that are important for your
safety.
696cq5-001
Warning symbol
This symbol indicates the articles regarding “Danger,” “Warning,” or “Caution.”
Those articles describe important safety precautions and so read them carefully to understand completely before
operating the machine.
Failure to adequately follow these safety precautions may cause an accident.
Danger
Danger
This symbol indicates that serious injury or death will occur if the warning is ignored.
Warning
This symbol indicates that serious injury or death may occur if the warning is ignored.
Caution
This symbol indicates that injury or damage to property may occur if the warning is ignored.
Important
This symbol indicates precautions on the mechanism of the machine.
LM531
Introduction

Precautionary Statement
Caution
The information described in this manual is
subject to change for improvement without
prior notice.
When replacing parts, be sure to use genuine
Baroness parts or parts designated by
Kyoeisha.
Note that the Baroness product warranty may
not apply to defects caused by the use of
parts from other companies.
For maintenance work on this product, refer to
the following manuals.
Baroness Owner's Operating Manual
The Engine's Owner's Manual
The Battery's Owner's Manual
For details on parts, refer to Parts Catalog.
As for repair items specified by the
manufacturers of the following products, their
respective disassembling and maintenance
procedures are not described in this manual.
Engine
Hydraulic equipment
For repair of those items, please contact your
sales dealer or Kyoeisha.
Please note that our product warranty may be
void if you disassemble or repair the items.
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LM531
Introduction

LM531
Introduction

Safety .............................................................. Page 1-1
Safe Operating Practices ...............................Page 1-2
Safety Signs and Instruction Signs ................ Page 1-5
Disposal .......................................................... Page 2-1
Recycle and Waste Disposal ......................... Page 2-2
Maintenance Standards and Maintenance .. Page 3-1
Unit Conversion ............................................. Page 3-2
Maintenance Standards .................................Page 3-4
Tightening Torques ........................................Page 3-5
General Precautions ...................................... Page 3-9
Special Tool ................................................. Page 3-12
Usage .......................................................... Page 3-19
Jacking Up The Machine ............................. Page 3-20
Greasing ...................................................... Page 3-21
Lubrication ................................................... Page 3-24
Hydraulic System ...........................................Page 4-1
General Inspection and Repair ...................... Page 4-2
Hydraulic Circuit Configuration .................... Page 4-12
Hydraulic Circuit Flow .................................. Page 4-21
Measurement ...............................................Page 4-29
Electrical System ........................................... Page 5-1
General Inspection and Repair ...................... Page 5-2
Electrical System Outline ...............................Page 5-8
Electrical Circuit Configuration .....................Page 5-17
Electrical components ..................................Page 5-26
Main Vehicle ................................................... Page 6-1
Specifications .................................................Page 6-2
Adjustment .....................................................Page 6-2
Removal and Installation of Each Section ..... Page 6-4
Inspection and Repair of Each Section ..........Page 6-5
Mechanical brake manual ..............................Page 6-6
Troubleshooting .............................................Page 7-1
Relating to Engine ......................................... Page 7-2
Relating to Traveling ......................................Page 7-5
Relating to Steering ....................................... Page 7-6
Relating to Mower Unit .................................. Page 7-7
Reference ........................................................Page 8-1
Specifications .................................................Page 8-2
Maintenance Schedule .................................. Page 8-3
List of Consumables ...................................... Page 8-8
LM531
Contents

LM531
Contents

Safe Operating Practices ...................... Page 1-2
Training ..................................................Page 1-2
Preparation ............................................ Page 1-2
Operation ...............................................Page 1-3
Maintenance and Storage ..................... Page 1-4
Safety Signs and Instruction Signs ..... Page 1-5
About Safety Signs and Instruction
Signs ......................................................Page 1-5
Safety
LM531
Safety
Page 1-1

Failure to adequately follow these safety
precautions may cause an accident resulting in
injury or death.
Danger
Danger
This product is designed to ensure safe
operation and has been tested and inspected
thoroughly before shipment from the factory.
The product is equipped with safety devices to
prevent accidents.
However, whether the product demonstrates
its original performance level depends on the
manner in which it is operated and handled,
as well as the manner in which it is managed
on a daily basis.
Inappropriate use or management of the
product may result in injury or death.
Observe the following safety instructions to
ensure safe operation.
Safe Operating Practices
Training
Read this manual and other training material
carefully. Be familiar with the controls, safety
signs, and the proper use of the equipment.
If the operator or mechanic can not read
English it is the owner's responsibility to
explain this manual to them.
All operators and mechanics should seek
and obtain professional and practical
instruction.
The owner is responsible for training the
users.
Such instruction should emphasize.
The need for care and concentration when
working with ride-on machines.
Control of a ride-on machine sliding on a
slope will not be regained by the
application of the brake.
The main reasons for loss of control are
Insufficient wheel grip
Being driven too fast
Inadequate braking
The type of machine is unsuitable for its
task
Lack of awareness of the effect of
ground conditions, especially slopes
Incorrect hitching and load distribution
1.
2.
3.
[1]
[2]
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Never allow children or people unfamiliar
with these instructions to use or service the
machine.
Local regulations may restrict the age of the
operator.
The owner/user can prevent and is
responsible for accidents or injuries
occurring to themselves, other people, or
property.
Keep in mind that the owner, operator, and
mechanic are responsible for accidents or
hazards occurring to other people or their
property.
The ROPS is an integral and effective safety
device.
Do not remove or alter the ROPS.
Replace a damaged ROPS.
Do not repair or alter.
You can find additional safety information
where needed throughout this manual.
Determine the left and right sides of the
machine from the normal operating position.
Preparation
Evaluate the terrain to determine what
accessories and attachments are needed to
properly and safety perform the job. Only
use accessories and attachments approved
by the manufacturer.
While operating, always wear substantial
footwear, long trousers, hard hat, safety
glasses, and ear protection. Long hair, loose
clothing, or jewelry may get tangled in
moving parts. Do not operate the equipment
when barefoot or wearing open sandals.
Inspect the area where the equipment is to
be used and remove all objects such as
rocks, toys and wire which can be thrown by
the machine.
Keep children out of the operating area and
under the watchful care of a responsible
adult other than the operator.
Exercise care in the handling of fuel.
Warning
Warning-Fuel is highly flammable. Take the
following precautions.
Store fuel in containers specifically
designed for this purpose.
4.
5.
6.
7.
8.
9.
10.
1.
2.
3.
4.
5.
[1]
LM531
Safety
Page 1-2 Safe Operating Practices

Add fuel before starting the engine. Never
remove the cap of the fuel tank or add fuel
while the engine is running or when the
engine is hot.
Refuel outdoors only and do not smoke
while refueling.
If fuel is spilled, do not attempt to start the
engine but move the machine away from
the area of spillage and avoid creating any
source of ignition until petrol vapours have
dissipated.
Replace all fuel tanks and container caps
securely.
Check that operator's presence controls,
safety switches and shields are attached and
functioning properly. Do not operate unless
they are functioning properly.
If the brake operation is faulty or the parking
brake lever has noticeable play, be sure to
adjust or repair them before operating the
machine.
Replace faulty mufflers.
On multi-cylinder/multi-reel machines take
care as rotating one cylinder/reel can cause
other cylinder/reels to rotate.
Operation
Do not operate the engine in a confined
space where dangerous carbon monoxide
fumes can collect.
Only operate in good light, keeping away
from holes and hidden hazards.
Before attempting to start the engine,
disengage all attachments, shift into neutral,
and engage the parking brake.
Only start engine from the operator`s
position.
Use seat belts if provided.
Remember there is no such thing as a safe
slope. Travel on grass slopes requires
particular care.
To guard against overturning:
Do not stop or start suddenly when going
up or downhill.
Engage clutch slowly, always keep
machine in gear, especially when traveling
downhill.
Machine speeds should be kept low on
slopes and during tight turns.
Stay alert for humps and hollows and
other hidden hazards.
[2]
[3]
[4]
[5]
6.
7.
8.
9.
1.
2.
3.
4.
[1]
[2]
[3]
[4]
Never operate across the face of the
slope, unless the machine is designed for
this purpose.
Never drive the machine on a slope with
an angle of gradient that is greater than
that specified or in a place where there is
a danger of the machine slipping.
Use extra care while operating machine with
a grass catcher or other attachments.
They can affect the stability of the machine.
Never operate the machine with damaged
guards, shields, or without safety protective
devices in place.
Be sure all interlocks are attached, adjusted
and functioning properly.
Do not change the engine governor settings
or overspeed the engine. Operating the
engine at excessive speed may increase the
hazard of personal injury.
Do the following before leaving the
operator`s position.
Stop on level ground.
Disengage the power take-off and lower
the attachments.
Change into neutral and set the parking
brake.
Stop the engine and remove the key.
Disengage the drive to attachments, stop the
engine, and remove the ignition key in the
following conditions.
Before refueling.
Before making height adjustment unless
adjustment can be made from the
operator's position.
Before cleaning blockages.
Before checking, cleaning, or working the
machine.
After striking a foreign object or if an
abnormal vibration occurs.
Inspect the machine for damage and
make repairs before restarting and
operating the equipment.
Keep hands and feet away from the cutting
units and the rotating parts.
Do not mow in reverse unless absolutely
necessary. Always look down and behind
before and while backing.
Do not carry passengers.
Never operate while people, especially
children, or pets are nearby.
[5]
[6]
5.
6.
7.
8.
[1]
[2]
[3]
[4]
9.
[1]
[2]
[3]
[4]
[5]
10.
11.
12.
13.
Safety
LM531
Safety
Page 1-3
Safe Operating Practices

Slow down and use caution when making
turns and crossing roads and sidewalks.
Stop the blades rotating before crossing
surfaces other than grass.
Disengage drive to attachments when
transporting or not in use.
When using any attachments, never direct
discharge of material toward bystanders nor
allow anyone near the machine while in
operation.
Do not operate the machine under the
influence of alcohol or drugs.
Take care when loading or unloading the
machine into a trailer or a truck. Load or
unload the machine in a flat and safe place.
Before loading or unloading, set the parking
brake on the truck or trailer, stop the engine,
and chock the wheels.
When transporting the machine on a truck or
a trailer, set the parking brake, stop the
engine, and fasten the machine to the truck
with a rope or other suitable restraining
device that has sufficient strength.
When using a loading ramp, select one with
sufficient strength, length, and width and that
will not cause the machine to slip.
Close the fuel valve before transporting the
machine.
Use care when approaching blind corners,
shrubs, trees, or other objects that may
obscure vision.
Do not take your eyes off the road ahead. Do
not operate the machine with no hands.
Reduce the throttle setting during engine
run-out and, if the engine is provided with a
shut-off valve, turn the fuel off at the
conclusion of operation.
Do not operate the machine when there is
the risk of lightning.
Maintenance and Storage
Disengage drives on level ground, lower the
attachments, set parking brake, stop engine
and remove key from ignition. Wait for all
movement to stop before adjusting, cleaning
or repairing.
When machine is to be parked, stored, or left
unattended, lower the cutting units unless a
positive machanical lock is provided.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
1.
2.
To reduce the fire hazard, keep the engine,
silencer/muffler, battery compartment fuel
storage area, cutting unit and drives free of
grass, leaves, or excessive grease. Clean up
oil or fuel spillage.
Allow the engine to cool before storing in any
enclosure.
Only cover the machine with a sheet after
hot parts have sufficiently cooled down.
Never store the equipment with fuel in the
tank inside a building where fumes may
reach an open flame or spark.
If the engine is provided with a shut-off
valve, shut off valve while storing or
transporting.
Do not store fuel near flames.
Never allow untrained personnel to service
machine.
Allow the engine/muffler to cool before
checking/maintenance.
Appropriately manage and correctly use the
tools necessary for servicing or adjusting the
machine.
Use jack stands to support components
when required.
Carefully release pressure from components
with stored energy.
Be sure to depressurize the hydraulic system
before performing maintenance operations
on it such as removing hydraulic equipment.
Check whether line connectors in the
hydraulic system are properly tightened.
Before applying hydraulic pressure, check
the connections of the hydraulic pressure
lines and the condition of the hoses.
When checking the hydraulic circuit for
pinhole leaks or oil leakage from nozzles, do
not use your hands. Use items such as
paper or corrugated cardboard to find
leakage points. Be extremely careful with
high-pressure oil as it may pierce your skin,
resulting in an injury.
If fluid is injected into the skin it must be
surgically removed within a few hours by a
doctor familiar with this form of injury or
gangrene may result.
Disconnect battery before making any
repairs. Disconnect the negative terminal
first and the positive last. Reconnect positive
first and negative last.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
LM531
Safety
Page 1-4 Safe Operating Practices

Make sure that parts such as wires are not
touching each other and that their covers
have not come off.
Use care when checking the cylinders/reels
and bed knives.
Wear gloves and use caution when
servicing them.
Be careful during adjustment of the
machine to prevent entrapment of the
fingers between moving blades and fixed
parts of the machine.
On multi-cylinder/multi-reel machines take
care as rotating one cylinder/reel can cause
other cylinder/reels to rotate.
Keep hands and feet away from moving
parts. If possible, do not make adjustments
with the engine running.
Charge batteries in an open well ventilated
area, away from spark and flames. Unplug
charger before connecting or disconnecting
from battery. Wear protective clothing and
use insulated tools.
Keep all parts in good working condition and
all hardware tightened. Replace all worn or
damaged decals.
Keep all nuts, bolts and screws tight to be
sure the equipment is in safe working
condition.
If the fuel tank has to be drained, do this
outdoors.
Swallowing engine coolant can cause injury
or death; keep out of reach from children and
pets.
Safety Signs and Instruction Signs
About Safety Signs and Instruction Signs
Important
Safety decals and instruction decals are
attached to this product.
Make sure that they are preserved in their
entirety. If they are damaged, become dirty, or
peel off, replace them with new ones.
Part numbers for decals that need to be
replaced are listed in the parts catalog.
Order them from a Baroness dealer or
Kyoeisha.
18.
19.
[1]
[2]
20.
21.
22.
23.
24.
25.
26.
Safety
LM531
Safety
Page 1-5
Safety Signs and Instruction Signs

LM531
Safety
Page 1-6 Safety Signs and Instruction Signs

Recycle and Waste Disposal ................ Page 2-2
About Recycle ........................................Page 2-2
About Waste Disposal ........................... Page 2-2
Disposal
LM531
Disposal
Page 2-1

Recycle and Waste Disposal
About Recycle
Recycling battery etc. is recommended for
environmental conservation and economical
use of resources.
It may be required by local laws.
About Waste Disposal
Make sure that waste generated when
servicing or repairing the machine is disposed
of in accordance with local regulations.
(e.g. waste oil, antifreeze, rubber products, and
wires etc.)
LM531
Disposal
Page 2-2 Recycle and Waste Disposal

Unit Conversion ..................................... Page 3-2
Inch-Millimeter Conversion Table .......... Page 3-2
US Unit-SI Unit Conversion Table ......... Page 3-3
Maintenance Standards ........................ Page 3-4
List of Maintenance Specifications ........ Page 3-4
Tightening Torques ............................... Page 3-5
Standard Tightening Torques ................ Page 3-5
Principal Tightening Torques .................Page 3-8
General Precautions ..............................Page 3-9
Bearing .................................................. Page 3-9
Stop Ring .............................................Page 3-10
Spring Pin ............................................ Page 3-10
Special Tool ..........................................Page 3-12
List of Special Tools ............................ Page 3-12
Usage .................................................... Page 3-19
Bearing Driver ......................................Page 3-19
Oil Seal Installer ...................................Page 3-19
Jacking Up The Machine .....................Page 3-20
About Jacking Up The Machine ...........Page 3-20
Jack-Up Points .....................................Page 3-20
Greasing ............................................... Page 3-21
About Greasing ....................................Page 3-21
Greasing Points ................................... Page 3-21
Lubrication ........................................... Page 3-24
About Lubrication .................................Page 3-24
Lubricating Points ................................ Page 3-24
Maintenance Standards and Maintenance
LM531
Maintenance Standards and Maintenance
Page 3-1

Unit Conversion
Inch-Millimeter Conversion Table
1 mm = 0.03937 in
1 in = 25.4 mm
Fractions Decimals mm Fractions Decimals mm
1/64 0.015625 0.397 33/64 0.515625 13.097
1/32 0.03125 0.794 17/32 0.53125 13.494
3/64 0.046875 1.191 35/64 0.546875 13.891
1/16 0.0625 1.588 9/16 0.5625 14.288
5/64 0.078125 1.984 37/64 0.578125 14.684
3/32 0.9375 2.381 19/32 0.59375 15.081
7/64 0.109275 2.778 39/64 0.609375 15.478
1/8 0.1250 3.175 5/8 0.6250 15.875
9/64 0.140625 3.572 41/64 0.640625 16.272
5/32 0.15625 3.969 21/32 0.65625 16.669
11/64 0.171875 4.366 43/64 0.671875 17.066
3/16 0.1875 4.762 11/16 0.6875 17.462
13/64 0.203125 5.159 45/64 0.703125 17.859
7/32 0.21875 5.556 23/32 0.71875 18.256
15/64 0.234375 5.953 47/64 0.734375 18.653
1/4 0.2500 6.350 3/4 0.7500 19.050
17/64 0.265625 6.747 49/64 0.765625 19.447
9/32 0.28125 7.144 25/32 0.78125 19.844
19/64 0.296875 7.541 51/64 0.796875 20.241
5/16 0.3125 7.938 13/16 0.8125 20.638
21/64 0.328125 8.334 53/64 0.828125 21.034
11/32 0.34375 8.731 27/32 0.84375 21.431
23/64 0.359375 9.128 55/64 0.859375 21.828
3/8 0.3750 9.525 7/8 0.8750 22.225
25/64 0.390625 9.922 57/64 0.890625 22.622
13/32 0.40625 10.319 29/32 0.90625 23.019
27/64 0.421875 10.716 59/64 0.921875 23.416
7/16 0.4375 11.112 15/16 0.9375 23.812
29/64 0.453125 11.509 61/64 0.953125 24.209
15/32 0.46875 11.906 31/32 0.96875 24.606
31/64 0.484375 12.303 63/64 0.984375 25.003
1/2 0.5000 12.700 1 1.000 25.400
LM531
Maintenance Standards and Maintenance
Page 3-2 Unit Conversion

US Unit-SI Unit Conversion Table
To Convert Into Multiply By
Linear Measurement
Miles
Yards
Feet
Feet
Inches
Inches
Inches
mi
yd
ft
ft
in
in
in
Kilometers
Meters
Meters
Centimeters
Meters
Centimeters
Millimeters
km
m
m
cm
m
cm
mm
1.609
0.9144
0.3048
30.48
0.0254
2.54
25.4
Area
Square Miles
Square Feet
Square Inches
Acre
mile2
ft2
in2
ac
Square Kilometers
Square Meters
Square Centimeters
Hectare
km2
m2
cm2
ha
2.59
0.0929
6.452
0.4047
Volume
Cubic Yards
Cubic Feet
Cubic Inches
yd3
ft3
in3
Cubic Meters
Cubic Meters
Cubic Centimeters
m3
m3
cm3
0.7646
0.02832
16.39
Weight
Tons (Short)
Pounds
Ounces (Avdp.)
sh tn
lb
oz
Metric Tons
Kilograms
Grams
ton
kg
g
0.9078
0.4536
28.3495
Pressure Pounds/Sq. In.
Pounds/Sq. In.
psi
psi
Kilopascal
Bar
kPa
mdyn/cm2
6.895
0.069
Work
Foot-pounds
Foot-pounds
Inch-pounds
lb-ft
lb-ft
lb-in
Newton-Meters
Kilogram-Meters
Kilogram-Centimeters
N-m
kgf-m
kgf-cm
1.356
0.1383
1.152144
Liquid Volume Quarts
Gallons
qt (US)
gal (US)
Liters
Liters
L
L
0.9463
3.785
Liquid Flow Gallons/Minute gal/min Liters/Minute L/min 3.785
Temperature Fahrenheit °F Celsius °C 1. Subract 32 °
2. Multiply by 5/9
Maintenance Standards and Maintenance
LM531
Maintenance Standards and Maintenance
Page 3-3
Unit Conversion

Maintenance Standards
List of Maintenance Specifications
LM531
Engine
Engine model Kubota D1105-E4B (Diesel)
No load rpm 1,400 - 3,000 rpm
Quantity of engine oil 3.1 dm3 (3.1 L) (0.82 gal (US))
(including filter)
API Service grade class CF or
higher, SAE Viscosity grade 10W-30
Coolant capacity 6.0 dm3 (6.0 L) (1.59 gal (US))
(including reserve tank)
Main vehicle (including hydraulic and electrical systems)
Fuel tank capacity 38.0 dm3 (38.0 L) (10.04 gal (US)) JIS No. 2 diesel fuel
Hydraulic tank capacity 35.0 dm3 (35.0 L) (9.25 gal (US)) Shell Tellus S2M46 or equivalent
(ISO VG46)
Parking brake proximity switch
Within 5.0 mm (0.20 in) Clearance from detection magnet
2 notches Position of detection magnet
Parking brake fulcrum part
Traveling neutral switch
Within 5.0 mm (0.20 in) Clearance from detection magnet
Trunnion neutral position Position of detection magnet
Trunnion fulcrum part
Mower proximity switch
Within 5.0 mm (0.20 in) Clearance from detection magnet
Outer end of bed knife of #4, #5
mower unit - 400mm（15.75in） from
the ground
Position of detection magnet
Fulcrum parts of #4 and #5 mowers
arms
Battery 75D23L
Tire pneumatic pressure
Front wheel 140 kPa (1.4 kgf/cm2)
(20.30 psi) 26.0 x 12.00-12
Rear wheel 100 kPa (1.0 kgf/cm2)
(14.50 psi) 20 x 10.00-10
Toe-in 0±5.0 mm (0±0.20 in)
LM531
Maintenance Standards and Maintenance
Page 3-4 Maintenance Standards

Tightening Torques
Important
Refer to the Tightening Torque table.
Note that the Baroness product warranty may
not apply to defects caused by incorrect or
overtorque tightening, etc.
Standard Tightening Torques
Bolts and Nuts
Important
A number of bolts are used in each part of this machine.
Be sure to re-tighten the bolts and nuts, because they may be loosened at the earlier stage of the
use.
As to the bolts and nuts without any special instruction, tighten them in appropriate tightening torque
with proper tool.
Too much tightening may cause the looseness or damage of the screw.
The strength of tightening is determined by types of screws, strength, the friction of thread face or
base face and others.
The table below is for the galvanized or parkerized bolts.
In case that the strength of internal thread is weak, it is not applied.
Do not use rusty or sand attached "screw."
Otherwise, it may cause insufficient tightening even if you apply the specified tightening torque.
The friction of the screw face becomes higher and the tightening torque is canceled out by the
friction, therefore sufficient tightening cannot be applied.
If "screw" is wet by water or oil, do not tighten it with normal tightening torque.
If the screw is wet, the torque coefficient will get smaller and it may result in too much tightening.
Too much tightening may cause looseness by the screw stretched or result in damage.
Do not use a bolt experienced too much burden.
Using the impact wrench requires the skill.
Do exercise as much as possible for steady tightening.
Maintenance Standards and Maintenance
LM531
Maintenance Standards and Maintenance
Page 3-5
Tightening Torques

Nominal
diameter
General bolt
Strength classification 4.8
M4 T
4.8
tib3yb-001
N-m kgf-cm lb-in
M5 3 - 5 30.59 - 50.99 26.55 - 44.26
M6 7 - 9 71.38 - 91.77 61.96 - 79.66
M8 14 - 19 142.76 - 193.74 123.91 - 168.17
M10 29 - 38 295.71 - 387.49 256.68 - 336.34
M12 52 - 67 530.24 - 683.20 460.25 - 593.02
M14 70 - 94 713.79 - 958.52 619.57 - 831.99
M16 88 - 112 897.34 - 1142.06 778.89 - 991.31
M18 116 - 144 1,182.85 - 1,468.37 1,026.72 - 1,274.54
M20 147 - 183 1,498.96 - 1,866.05 1,301.10 - 1,619.73
M22 295 3,008.12 2,611.05
M24 370 3,772.89 3,274.87
M27 550 5,608.35 4,868.05
M30 740 7,545.78 6,549.74
Nominal
diameter
Heat-treated bolt
Strength classification 8.8 Strength classification 10.9
8 T
8.8
8
tib3yb-002
11T
10.9
11
tib3yb-003
N-m kgf-cm lb-in N-m kgf-cm lb-in
M5 5 - 7 50.99 - 71.38 44.26 - 61.96 7 - 10 71.38 - 101.97 61.96 - 88.51
M6 8 - 11 81.58 - 112.17 70.81 - 97.36 14 - 18 142.76 - 183.55 123.91 - 159.32
M8 23 - 29 234.53 - 295.71 203.57 - 256.68 28 - 38 285.52 - 387.49 247.83 - 336.34
M10 45 - 57 458.87 - 581.23 398.30 - 504.51 58 - 76 591.43 - 774.97 513.36 - 672.68
M12 67 - 85 683.20 - 866.75 593.02 - 752.34 104 - 134 1,060.49 - 1,366.40 920.50 - 1186.03
M14 106 - 134 1,080.88 - 1,366.40 938.21 - 1,186.03 140 - 188 1,427.58 - 1,917.04 1,239.14 - 1,663.99
M16 152 - 188 1,549.94 - 1,917.04 1,345.35 - 1,663.99 210 - 260 2,141.37 - 2,651.22 1,858.71 - 2,301.26
M18 200 - 240 2,039.40 - 2,447.28 1,770.20 - 2,124.24 280 - 340 2,855.16 - 3,466.98 2,478.28 - 3,009.34
M20 245 - 295 2,498.27 - 3,008.12 2,168.50 - 2,611.05 370 - 450 3,772.89 - 4,588.65 3,274.87 - 3,982.95
M22 - - - 530 5,404.41 4,691.03
M24 - - - 670 6,831.99 5,930.17
M27 - - - 1,000 10,197.00 8,851.00
M30 - - - 1,340 14,628.78 11,860.34
Note:
The same values are applied to "fine screw thread."
LM531
Maintenance Standards and Maintenance
Page 3-6 Tightening Torques