Nothing Special   »   [go: up one dir, main page]

Diferencial FUSO

Download as pdf or txt
Download as pdf or txt
You are on page 1of 27

https://truckmanualshub.

com/
REDUCTION AND DIFFERENTIAL

Disassembly sequence
1 Lock plate 6 Differential (See later sections.)
2 Side bearing nut 7 Pinion (See later sections.)
3 Bearing cap 8 Shim
4 Side bearing outer race 9 Differential carrier
5 Side bearing inner race

CAUTION
• Keep side bearings, which have been removed, separately from each other and ensure that the correct
one is placed at the right place at installation.
• Be sure to replace the bearing cap, differential carrier and bolts as a differential carrier set.
• Be sure to replace the reduction gear of the differential and reduction pinion of the pinion as a reduction
gear set.

NOTE
• Record the number and thickness of shims to use them as reference at assembly.

Assembly sequence
Follow the disassembly sequence in reverse.

27-36
27
https://truckmanualshub.com/

Service standards (Unit: mm {in.})


Location Maintenance item Standard value Limit Remedy
2.0 to 2.9 N·m
{1.4 to 2.2 ft.lbs,
0.2 to 0.3 kgf·m}
7, 8 Starting torque of side bearing – Adjust
(tangential force: 25 to 38 N
{5.6 to 8.5 lbs.,
2.6 to 3.9 kgf})
9 Wobble at back face of reduction gear 0.1 {0.0039} or less – Replace
Backlash between reduction gear and reduction 0.20 to 0.28 0.5
9, 11 Adjust or replace
pinion {0.0079 to 0.011} {0.020}

Tightening torque (Unit: N·m {ft.lbs, kgf·m})


Mark Parts to be tightened Tightening torque Remarks
Bolt (Lock plate mounting) 20 to 26 {19.6 to 26.5, 2.0 to 2.7} –
Bolt (Bearing cap mounting) 200 {150, 20.5} –
Bolt (Pinion mounting) 67 to 90 {49 to 67, 6.8 to 9.2} –

Lubricant and/or sealant


Mark Points of application Specified lubricant and/or sealant Quantity
Pinion pilot bearing mounting surface of differential carri-
LOCTITE 601 As required
er

27-37
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Special tools (Unit: mm {in.})
Mark Tool name and shape Part No. Application

Differential working
base assembly

Component Part No.


Attachment – Workbench for reduction and dif-
ferential
A RA F G – MB999034
R158 30° φ13 MB999040 (Flange stopper is unused)
B Holder MB999036
C Holder MB999037
D Working base MB999035
E Flange stopper MB999096

H J K L
11 20 40 φ11
{0.43} {0.79} {1.57} {0.43}

Adapter
Removal of side bearing inner
A B MB999076 race (to be used in combination
with commercial bearing puller)
φ45 φ59
{1.77} {2.32}

Bearing installer
Installation of side bearing inner
A B MH061748
race
φ80 φ70
{3.15} {2.76}

Bearing retainer
guide pin
Installation of pinion (two pieces
MH061745
are used)

A B C D
18 85 12
M12 × 1.25
{0.71} {3.35} {0.47}

27-38
27
https://truckmanualshub.com/

Work before removal


Preparatory work: Installation of differential working base
assembly
• Install the reduction and differential on .

Inspection: Backlash between reduction gear and reduction


pinion
• If backlash is found faulty, the tightening amount of the side
bearing nut is probably inappropriate.

Inspection: Wobble at back face of reduction gear


• Measure wobble at the illustrated position of the reduction gear.

Inspection: Starting torque of side bearing


• Measure the tangential force at the outer periphery point of the
differential case using a spring balancer.
• If the tangential force is within the range of the measured value,
the starting torque conforms to the standard value.
NOTE
• Measure the starting torque within the range of backlash
between the reduction gear and reduction pinion.

• Starting torque may be measured of the pinion assembly by us-


ing a torque wrench.
(Total starting torque – Pinion bearing starting torque) ×
Final ratio = Side bearing starting torque
NOTE
• Always measure the starting torque within the range of
backlash between the reduction gear and reduction pinion.

27-39
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Inspection: Tooth contact of reduction gear
• Apply red lead to three to four teeth at three equally spaced
points of the reduction gear.
• Turn the reduction gear several times to check for tooth contact.

Alignment marks: Bearing cap and differential carrier


• Put alignment marks on the bearing cap and differential carrier
for correct identification of right and left parts.

Removal procedure
Removal: Side bearing inner race

Inspection: Starting torque of pinion bearing


• After removing the differential, measure the starting torque of
the pinion bearing.

Removal: Pinion
• Screw two bolts evenly into the pinion removal screw holes to
remove the pinion.

27-40
27
https://truckmanualshub.com/

Adjustment procedure
Adjustment: Pinion
• Perform the following steps to adjust A, B and C within the spec-
ified dimensions.
• Calculate shim thickness D by using the following formula based
on the machining error data stamped on pinion assembly and
differential carrier.
• Formula:
D = 0.5 {0.020} – a + b + c
a = Deviation from standard dimension A
b = Deviation from standard dimension B
c = Deviation from standard dimension C
Unit: mm {in.}
Standard
Location How to calculate deviation
dimension
0.5
Shim thickness –
{0.020}
A numeral, multiplied by 100, is stamped
203
A {7.99}
on the outer periphery of the flange of the
differential carrier.
157 A numeral is stamped on the top of the
B {0.18} pinion assembly.
Measure deviation from dimension C us-
46.5 ing a dial gauge. Taking measurement is
C {1.8} usually not feasible and assume a value
from 0 to 0.2 mm.

• Select a shim based on shim thickness D.


Thickness of shims available
0.1 mm {0.0039 in.}, 0.2 mm {0.0079 in.} (two thickness)

Installation procedure
Installation: Pinion
• Apply sealant to the pilot bearing mounting surface of the differ-
ential carrier.

• Aligning the embossed alignment mark on the bearing retainer


of the pinion assembly with that on the differential carrier, mount
the pinion assembly.
CAUTION
• Leave for 30 minutes to 2 hours after installation to let the
sealant harden.
• Wait at least three hours or, if feasible 24 hours, before run-
ning the vehicle to let the sealant harden.

27-41
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Inspection: Starting torque of pinion bearing
• After installing the pinion, measure the starting torque of the pin-
ion bearing.
• If the measured value deviates from the standard value, adjust.

Installation: Side bearing inner race

Work after installation


Adjustment: Backlash between reduction gear and reduc-
tion pinion
• Adjust backlash with the side bearing nut, using care not to allow
the side bearing starting torque to change.
CAUTION
• When one side bearing nut is loosened, be sure to tighten
the other one the same amount to prevent the side bearing
starting torque from changing.

Inspection: Wobble at back face of reduction gear


• Measure wobble at the illustrated position of the reduction gear.
• If the measured value deviates from the standard value, replace
the reduction gear and reduction pinion of the differential as a
set.

Inspection: Starting torque of side bearing


• Measure the tangential force at the outer periphery point of the
differential case using a spring balancer.
• If the tangential force is within the range of the specified value,
the starting torque conforms to the standard value.
• If the measured value deviates from the standard value, adjust
with the side bearing nut.
NOTE
• Measure the starting torque within the range of backlash
between reduction gear and reduction pinion.
27-42
27
https://truckmanualshub.com/

• Starting torque may be measured of the pinion assembly by us-


ing a torque wrench.
(Total starting torque – Pinion bearing starting torque) ×
Final ratio = Side bearing starting torque
NOTE
• Always measure the starting torque within the range of
backlash between the reduction gear and reduction pinion.

Inspection: Tooth contact of reduction gear


[Inspection]
• Apply red lead to three to four teeth at three equally spaced
points of the reduction gear.
• Turn the reduction gear several times to check for tooth contact.
• Adjust tooth contact if it is remarkably offset.

Correct tooth contact at no load


<Reduction gear>
A: Heel
B: Toe
C: Face
D: Flank
E: Clearance

<Reduction pinion>
A: Heel
B: Toe
C: Face
D: Flank
E: Clearance

Maintenance item Assembly standards


Lengthwise direc-
From center towards toe
tion of tooth
Tooth contact position
From center towards top of tooth for reduction gear and center
Vertical direction
for reduction pinion
At no load
Length Approximately 50 to 70% of tooth width
Tooth contact shape
Width Approximately 50 to 70% of tooth depth
Degree of tooth contact It becomes weaker as it nears tooth root and tooth tip

27-43
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
NOTE
• When tooth contact is near the toe at no load, it becomes
middle area contact at load.
[Adjustment]
• Adjust by backlash between reduction gear and reduction pinion
(to be adjusted with the side bearing nut) and addition or reduc-
tion of rear bearing shims.
CAUTION
• Make sure you replace as a reduction gear set (reduction
gear and reduction pinion), when you replace the gear be-
cause of excessive teeth wear.

Method of adjustment Moving direction


Advance reduction pinion to reduction
gear (Shims are reduced)
Tooth contact by addition or reduction of shims

Tooth contact moves towards tooth root

Retard reduction pinion from reduction


gear (Shims are added)

Tooth contact moves towards tooth tip

Advance reduction gear to reduction pin-


Tooth contact by adjustment with side bearing nut

ion center (Less backlash)


Tooth contact moves in lengthwise direc-
tion of tooth
Leading edge: Nearer to toe and slightly
nearer to root of tooth
Trailing edge: Nearer to heel and slightly
nearer to top of tooth

Retard reduction gear from reduction pin-


ion center (More backlash)
Tooth contact moves in lengthwise direc-
tion of tooth
Leading edge: Nearer to heel and slightly
nearer to top of tooth
Trailing edge: Nearer to toe and slightly
nearer to root of tooth

27-44
27
https://truckmanualshub.com/

M E M O

27-45
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Differential
Disassembly sequence
1 Reduction gear
2 Differential case RH
3 Side gear washer
4 Side gear
5 Pinion washer
6 Differential pinion
7 Pinion spider
8 Differential case LH

CAUTION
• Be sure to replace the differential
case RH and the differential case
LH as a differential case set.
• Be sure to replace the side gear and
the differential pinion as a side gear
set.

Assembly sequence
Follow the disassembly sequence in re-
verse.

Service standards (Unit: mm {in.})


Location Maintenance item Standard value Limit Remedy
0.05 to 0.15 0.5
4 Backlash between side gear and spline of axle shaft Replace
{0.0020 to 0.0059} {0.020}
0.15 to 0.20 0.5
4, 6 Backlash between side gear and differential pinion Replace
{0.0059 to 0.0079} {0.020}
0.17 to 0.27 0.5
6, 7 Clearance between differential pinion and pinion spider Replace
{0.0067 to 0.011} {0.020}

Tightening torque (Unit: N·m {ft.lbs, kgf·m})


Mark Parts to be tightened Tightening torque Remarks
166.6 to 225.4
Bolt (Reduction gear mounting) –
{120 to 165, 17 to 23}
83.3 to 112.7
Bolt (Differential case RH and differential case LH mounting) –
{61 to 83, 8.5 to 11.5}

Lubricant and/or sealant


Mark Points of application Specified lubricant and/or sealant Quantity
Entire bolt Rust preventive As required
Thread area of bolt
LOCTITE 271 As required
Bolt tip of differential case LH

27-46
27
https://truckmanualshub.com/

Work before removal


Alignment marks: Reduction gear and differential case LH
• Put alignment marks on the reduction gear and differential case
LH.

Inspection: Backlash between side gear and differential pin-


ion
• If backlash is found faulty, thickness of the side gear washer and
pinion washer is probably inappropriate.

Inspection procedure
Inspection: Backlash between side gear and axle shaft
• If the measured value exceeds the limit, replace defective parts.

Installation procedure
Installation: Differential case RH and differential case LH
• Apply rust preventive to the entire surface of the bolt.
• Apply thread lock cement to the bolt threads.
• Tighten the bolt to the specified torque.
CAUTION
• Make sure to apply rust preventive when tightening the bolt
to the specified torque.
• Wait at least one hour after installation before actually run-
ning the vehicle to let the thread lock cement harden.
• Wait at least four hours after installation before operating
the vehicle at full torque to let the thread lock cement hard-
en.

27-47
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Installation: Reduction gear and differential case LH
• Apply rust preventive to the entire surface of the bolt.
• Apply thread lock cement at the entry of bolt holes on differential
case LH.
• Tighten the bolt to the specified torque.
CAUTION
• Make sure to apply rust preventive when tightening the bolt
to the specified torque.
• Wait at least one hour after installation before actually run-
ning the vehicle to let the thread lock cement harden.
• Wait at least four hours after installation before operating
the vehicle at full torque to let the thread lock cement hard-
en.

Work after installation


Inspection: Backlash between side gear and differential pin-
ion
• If the measured value deviates from the standard value, replace
the side gear washer and pinion washer.
Thickness of side gear washers available
3.0 mm {0.11 in.} (one thickness)
Thickness of pinion washers available
1.6 mm {0.063 in.} (one thickness)
CAUTION
• Use side gear washers of the same thickness for the right
and left sides.
• Use pinion washers of the same thickness at four locations.

27-48
27
https://truckmanualshub.com/

M E M O

27-49
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Pinion
Disassembly sequence
1 Lock nut
2 Companion flange
3 Dust cover
4 Collar
5 Rear bearing inner race
6 Lock ring
7 Pinion pilot bearing
8 Reduction pinion
9 Oil seal
10 Front bearing inner race
11 Front bearing outer race
12 Rear bearing outer race
13 Bearing retainer

: Non-reusable parts

NOTE
• Record the height of the collar to
use it as reference at assembly.

Assembly sequence
Follow the disassembly sequence in re-
verse.

Service standards (Unit: mm {in.})


Location Maintenance item Standard value Limit Remedy
2.0 to 2.9 N·m
{1.4 to 2.2 ft.lbs,
When new bear- 0.20 to 0.30 kgf·m}
– Adjust or replace
ing is used (tangential force: 34 to 52 N
{7.6 to 11 lbs.,
Starting torque of pinion bearing 3.5 to 5.3 kgf})
– (Tangential force at outer periph-
ery point of bearing retainer) 1.6 to 2.4 N·m
{1.2 to 1.7 ft.lbs,
When old bearing 0.16 to 0.24 kgf·m}
– Adjust or replace
is reused (tangential force: 27 to 41 N
{6.1 to 9.2 lbs.,
2.8 to 4.2 kgf})

Tightening torque (Unit: N·m {ft.lbs, kgf·m})


Mark Parts to be tightened Tightening torque Remarks
372.4 to 470.4
Lock nut (Companion flange mounting) –
{275 to 345, 38 to 48}

Lubricant and/or sealant


Mark Points of application Specified lubricant and/or sealant Quantity
Wheel bearing grease
Lip area of oil seal As required
[NLGI No. 2 (Li soap)]

27-50
27
https://truckmanualshub.com/

Special tools (Unit: mm {in.})


Mark Tool name and shape Part No. Application

Pinion bearing
remover
Removal of rear bearing inner
A B MB999045
race
0.5 25.6
{0.020} {1.00}

Pinion bearing
installer
Installation of rear bearing inner
A B C MH061005
race and front bearing inner race
φ62 φ52 φ125
{2.44} {2.05} {4.92}

Pinion pilot bearing


installer

A B MH061976 Installation of pinion pilot bearing


φ45.2 φ39.2
{1.78} {1.54}

Oil seal installer

A B
MH061750 Installation of oil seal
φ112 φ88
{4.41} {3.46}

Pinion bearing
installer
Installation of front bearing outer
A B MH061977
race
φ89 φ78
{3.50} {3.07}

Pinion bearing
installer
Installation of rear bearing outer
A B MH061264
race
φ99 φ88
{3.90} {3.46}

27-51
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Work before removal
Inspection: Starting torque of pinion bearing
• Apply the specified load to the companion flange or tighten the
lock nut to the specified torque.
• Measure the tangential force at outer periphery point of the bear-
ing retainer using a spring balancer.
CAUTION
• Securely fix the companion flange to measure.

• If the measured tangential force is within the specified value, the


starting torque conforms to the standard value.
Removal procedure
Removal: Reduction pinion

Removal: Rear bearing inner race

Removal: Front bearing outer race


• Drive out the front bearing outer race by tapping evenly at three
indented parts in the bearing retainer.

27-52
27
https://truckmanualshub.com/

Removal: Rear bearing outer race


• Drive out the rear bearing outer race by tapping evenly at three
indented parts in the bearing retainer.

Installation: Rear bearing outer race

Installation: Front bearing outer race

Installation: Front bearing inner race


• Install the front bearing inner race with the pinion assembled into
the bearing retainer.

Installation: Oil seal


• Apply grease to the lip area of the oil seal and install it on the
bearing retainer in the illustrated direction.

27-53
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Installation: Pinion pilot bearing
• Install the pinion pilot bearing with its retaining ring placed on the
gear.

Installation: Rear bearing inner race

Inspection after installation


Inspection: Starting torque of pinion bearing
• Apply the specified load to the companion flange or tighten the
lock nut to the specified torque.
• Measure the tangential force at outer periphery point of the bear-
ing retainer using a spring balancer.
CAUTION
• Securely fix the companion flange to measure.
• Do not assemble the oil seal when measuring the tangential
force.

• If the measured tangential force is within the specified value, the


starting torque conforms to the standard value.
• If the measured value deviates from the standard value, adjust
by changing a collar.
Thickness of collars available
15.600 to 16.200 mm {0.61 to 0.64 in.} (25 thickness in 0.025
mm {0.00098 in.} increments)

27-54
27
https://truckmanualshub.com/

M E M O

27-55
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
LSD (Limited Slip Differential)

Disassembly sequence
1 Reduction gear 7 Friction disc 13 Pressure ring
2 LSD (Limited Slip Differential) 8 Friction plate 14 Side gear
3 Differential case LH 9 Friction disc 15 Differential pinion
4 Side gear washer 10 Friction plate 16 Pinion spider
5 Spring plate 11 Friction disc 17 Differential case RH
6 Friction plate 12 Friction plate

CAUTION
• Make sure to replace the side gear and the differential pinion as a side gear set.

Assembly sequence
Follow the disassembly sequence in reverse.

27-56
27
https://truckmanualshub.com/

Service standards (Unit: mm {in.})


Location Maintenance item Standard value Limit Remedy
201 to 298 N·m
When new clutch plate
{150 to 220 ft.lbs, –
is assembled
Rotation torque 15 to 27 kgf·m}
of clutch plate 117 to 298 N·m
When old clutch plate
{86 to 220 ft.lbs, –
2 LSD is reassembled Replace
19 to 27 kgf·m}
0.05 to 0.20
Clearance in side gear axial direction –
{0.0020 to 0.0079}
Clearance in differential case axial direc- 0.05 to 0.20

tion {0.0020 to 0.0079}
4, Difference in dimensions from side gear washer end 0 to 0.05
– Replace
11 to 14 face to pressure ring back face between right and left {0 to 0.0020}
0.08
Distortion –
{0.0031}
Replace
0.1
Wear –
7 to 10 Friction disc and friction plate {0.0039}
Difference in thickness
0 to 0.05
of right and left combi- – Adjust
{0 to 0.0020}
nation

Tightening torque (Unit: N·m {ft.lbs, kgf·m})


Mark Parts to be tightened Tightening torque Remarks
Bolt (Reduction gear mounting) 167 to 225 {120 to 165, 17 to 23} –

Lubricant and/or sealant


Mark Points of application Specified lubricant and/or sealant Quantity
Bolt threads of reduction gear LOCTITE 271 As required
Limited slip differential oil
Each part As required
API GL-5 SAE 90

27-57
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Special tools (Unit: mm {in.})
Mark Tool name and shape Part No. Application

Side gear holding


tool se

D
20
{0.79}

Component Part No. Applied Measure rotation torque of LSD


type MB999140
clutch plate
A Gauge case MB990551 –
B Side gear holding base MB999141 –
Side gear holding tool – –
Outer Number Spline
– –
diameter of tooth diameter
φ39 16 φ35.6
C {1.54} {0.63} {1.40} MH063422 –

φ42 18 φ39.6 MB999142 D033H


{1.65} {0.71} {1.56}
φ42 20 φ42
MH063423 –
{1.65} {0.79} {1.65}

Work before removal


Alignment marks: Reduction gear and limited slip differen-
tial
• Put alignment marks on the reduction gear and limited slip differ-
ential.

Inspection procedure
Inspection: Rotation torque of LSD clutch plate
• After removing the reduction gear, carry out the following in-
spection.
• Measure the rotation torque to check for the friction force of the
clutch plate.
NOTE
• For measurement of rotation torque, rotate the side gears to
sufficiently smooth their operation and measure the value
during their rotation.

27-58
27
https://truckmanualshub.com/

Inspection: Limited slip differential


(1) Inspection of contacting and sliding surfaces
• If heat discoloration and remarkable wear are found on friction
surfaces and sliding surfaces of the spring plates, spring discs,
friction discs and friction plates, replace defective parts.
NOTE
• Strong contact on the inner periphery of friction surfaces is
caused by the spring force of each plate and disc. Do not
mistake that it is caused by abnormal wear.

• If cracks and damage are found on protrusions on the inside and


outside periphery of the spring plates, friction discs and friction
plates, replace defective parts.
• If dents and damage are found on the friction surfaces and slid-
ing surfaces of the pressure rings to friction discs, polish them
with an oilstone, and lap and correct them with a compound on a
surface plate.
NOTE
• Strong contact on the inner periphery of friction surfaces is
caused by the spring force of each plate and disc. Do not
mistake that it is caused by abnormal wear.
• Inspect contacting and sliding areas of the differential case
LH, side gear washers, pressure rings, side gears, differential
pinion, pinion spider and differential case RH, and correct burrs
and dents with an oilstone.

(2) Inspection of distortion


• Apply a dial gauge to the friction disc and friction plate on a sur-
face plate and measure their distortion (flatness) while turning
them. If the measured value exceeds the limit, replace.

27-59
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
(3) Inspection of thickness
• Measure thickness of the friction surfaces and protrusions of
the spring plate, friction disc and friction plate, and find the differ-
ence. If it exceeds the limit, replace defective parts.
NOTE
• Take measurement at several points for each part.

Work before assembly


• Before assembling the limited slip differential, adjust the dimen-
sional difference (friction force of clutch plate) in the axial direc-
tion and the clearance in the side gear axial direction, when
assembling integral parts of the differential cases LH and RH, in
the following procedure.

• Pile friction discs and friction plates as illustrated and measure


thickness with a micrometer. Select the combination so that the
difference in thickness between the right and left combination
falls within the range of the standard value.
Thickness of friction discs available
1.9, 2.0, 2.1 mm {0.075, 0.079, 0.083 in.} (three sizes)
Thickness of friction plates available
2.0 mm {0.079 in.} (one size)

• Pile a spring plate and a spring disc as illustrated and measure


thickness with a micrometer. Select the combination so that the
difference in thickness between the right and left combination is
as small as possible.
Thickness of spring plates available
2.0 mm {0.079 in.} (one size)

• Assemble the pressure rings, pinion spiders, friction discs, fric-


tion plates, spring plates and spring discs and measure overall
width A with a micrometer.
NOTE
• Measure the overall width with the V-shaped groove of the
pressure ring pressed against the pinion spider from both
sides to obtain secure contact.

27-60
27
https://truckmanualshub.com/

• Find dimension B between spring plate contact faces when the


differential cases LH and RH are combined.
B=C+D–E

• If overall width A measured in the previous item and the clear-


ance (B-A) between the differential cases LH and RH deviate
from the standard value, adjust by changing a friction plate.
Thickness of friction plates available
1.9, 2.0, 2.1 mm {0.075, 0.079, 0.083 in.} (three sizes)

• After installing the side gear washers as illustrated, make sure


that the difference between F and G dimensions from the back
face of the pressure rings to the end face of the side gear wash-
ers falls within the range of the standard value.
NOTE
• Measure the dimensions with the V-shaped groove of the
pressure ring pressed against the pinion spider from both
sides to obtain secure contact.

• If the difference in dimension deviates from the standard value,


adjust by changing the side gear washer.
Thickness of side gear washers available
1.5, 1.6, 1.7 mm {0.059, 0.063, 0.067 in.} (three sizes)

• Measure overall width H.

• Find dimension J between side gear washer contact faces when


the differential cases LH and RH are combined.
J=B+K+L
NOTE
• For dimension B, refer to the difference between spring
plate contact surfaces found in the previous item when the
differential cases LH and RH are combined.

• Check that clearance in the side gear axial direction is within the
range of the standard value.
• If the clearance deviates from the standard value, adjust by
changing the side gear washer.
Thickness of side gear washer available
1.5, 1.6, 1.7 mm {0.059, 0.063, 0.067 in.} (three sizes)
NOTE
• Select side gear washers so that the right and left dimen-
sional difference from the back face of the pressure rings to
the end face of the side gear washers conforms to the stan-
dard value.
27-61
https://truckmanualshub.com/
REDUCTION AND DIFFERENTIAL
Assembly procedure
Assembly: LSD (Limited Slip Differential)
• Assemble each part into the differential case RH in the illustrat-
ed direction.
NOTE
• Take care not to install the friction discs and friction plates
in a wrong sequence and the spring plates in a wrong direc-
tion.
• When assembling, apply gear oil to each part. Especially,
apply gear oil carefully to contact surfaces and sliding sur-
faces.

• Aligning the alignment mark (the same Arabic numeral) of the


differential case LH with that of the differential case RH, tighten
screws in the diagonal sequence gradually and evenly.
NOTE
• If the differential cases LH and RH do not contact positively
each other even after screws have been tightened fully, im-
properly assembled side gear washers and spring plates
are suspected. In that case, reassemble these parts.

Inspection: Rotation torque of limited slip differential clutch


plate
• After assembling LSD, carry out the following inspection.
• Measure the rotation torque to check for the friction force of the
clutch plate.
NOTE
• For measurement of rotation torque, rotate the side gears to
sufficiently smooth their operation and measure the value
during their rotation.

• If the measured value deviates from the standard value, replace


defective parts of the internal components.

27-62

You might also like