Page 932 of 1449
FRONT AXLE -Special Tools26-4
Tool UseName Number
MB990685Torque wrenchMeasurement of wheel bearing rotation
starting torque
MB990326Preload socketMeasurement of wheel bearing rotation
starting torque
A
B
C
A: MB991017
B: MB990998
C: MB991000A,B: Front hub
remover and
installer
C: SpacerDProvisional holding of the wheel bearing
DMeasurement of wheel bearing rotation
starting torque
DMeasurement of wheel bearing axial play
MB991000, which belongs to MB990998,
should be used as a spacer.
MB991721Sliding hammerOutput shaft removal
MB991561Boot band clipping
toolResin boot band installation
MB990925
Brass bar
Installer adapterTool box
Bar (snap-in type) ACB
TypeTool numberO.D. mmTypeTool numberO.D. mm
MB99092639MB99093363.5
MB99092745MB99093467.5
MB99092849.5AMB99093571.5
AMB99092951MB99093675.5
MB99093054MB99093779
MB99093157BMB990938-
MB99093261CMB990939-
Page 936 of 1449

FRONT AXLE -Hub and Knuckle Assembly26-8
INSTALLATION SERVICE POINT
"AACASTLE NUT INSTALLATION
1. Be sure to install the castle nut washer in the specified
direction.
2. Using the special tool, tighten the castle nut.
Caution
Before securely tightening the castle nuts, make sure
there is no load on the wheel bearings. Otherwise
wheel bearing will be damaged.
INSPECTION
INSPECTION OF WHELL BEARING ROTATION STARTING
TORQUE
1. Tighten special tools in hub and knuckle assembly to
the specified torque.
2. Measure the wheel bearing rotation starting torque with
special tools.
Limit: 1.03 N·m or less
3. Wheel bearing rotation starting torque must be under
the limit value and there should be no roughness when
rotating the hub.
WHEEL BEARING AXLE PLAY CHECK
1. Secure knuckle in a vice to measure axle play in wheel
bearing.
Limit: 0.06 mm
2. If the limit value of wheel bearing axle plya cannot be
obtained when tightened to the specified torque (245
±29 N·m), check mounting bolt for hub and knuckle
assembly. If no defects are found, replace hub assembly.
MB990767
245±29 N·m
Washer
MB991000
(MB990998)
Bolt
245±29 N·m
Secure bolt and
tighten nut.
MB991017
MB990326
MB990685
MB991000
(MB990998)
245±29 N·m
Secure bolt and
tighten nut.
MB991017
Page 949 of 1449

REAR AXLE -Service Specifications/Lubricants27B-3
SERVICE SPECIFICATIONS
ItemStandard valueLimit
Rear axle total backlash mm-6
Wheel bearing rotation starting torque N·m-1.0
Wheel bearing axial play mm-0.05 or less
Wheel bearing rotary-sliding resistance N-22 or less
TJ boot assembly dimension mm90±3-
Drive gear backlash mm0.11 – 0.16-
Drive gear runout mm-0.05
Drive pinion turning
torqueN·m
Without oil seal0.88 – 1.17-
torqueN·m
With oil sealCompanion flange (oil seal contact-
ing area) with anti-rust agent0.98 – 1.27-
Companion flange (oil seal contact-
ing area) with gear oil applied0.49 – 0.58-
Vehicles with mechani-
cal LSDRight-to-left difference in combined thickness of friction
plate and friction disc
mm
0 – 0.05-
Clearance between spring plate and differential case
mm
0.06 – 0.25-
LSDdifferential
torqueN·m
When new clutch plate is installed5–19-
torqueN·m
When existing clutch plate is
installed2–19-
Distortion of friction plate and friction discmm-0.08
Difference in thickness between friction plate, friction
disc, and spring plate
mm
-0.1
Vehicles with ACD and
AY CPressure generated by hydraulic unit (pressure sensor
value
)MPa
0.9 – 1.1-
LUBRICANTS
ItemSpecified lubricantsQuantity
Vehicles with
mechanical
S
Gear oilHypoid gear oil
MITSUBISHI Genuine Gear Oil Part No. 81496300.55L
LSDMITSUBISHIGenuineGearOilPartNo.8149630
EX, CASTROL HYPOY LS (GL-5, SAE 90),
SHELL-LSD (GL-5, SAE 80W - 90) or equivalent
Vehicles with
ACD and
AY CGear oilDifferentialHypoid gear oil
API classification GL-5 or higher SAE viscosity
No.90, 80W0.55±0.02L
Torque transfer
mechanismATF-SP™0.65 - 0.7L
Page 950 of 1449

REAR AXLE -Lubricants/Sealants/Special tools27B-4
ItemQuantity Specified lubricants
Vehicles with
ACDand
Hydraulic piping fluidATF-SP™1L
ACDand
AY CTorque transfer mechanism oil
seal lipsVaselineAs required
B.J. jointRepair kit grease85±10 g
T.J. jointRepair kit grease105±10 g
SEALANTS
ItemsSpecified sealantsRemarks
Vehicles with me-
chanicalLSD
Vent plug3M ATD Part No. 8661, 8663 or
equivalent
Semi-drying sealant
chanicalLSD
Differential cover assembly
equivalent
Vehicles with ACD
andAYC
Vent plug
andAYC
Differential carrier cover
mounting part
Vehicles with me-
chanical LSDDrive gear and differential
case mounting part3M Stud Locking 4170 or equivalentAnaerobic sealant
SPECIAL TOOLS
ToolNumberNameUse
MB991502MUT-IIsub as-
semblyInspection of AYC (diagnosis display by
MUT-II)
MB991529Diagnosis code
check harnessInspection of AYC
(diagnosis display by ACD mode indicator
lamp)
MD998330
(MD998331)Oil pressure gaugeHydraulic pressure measurement
with AYC>
MB991705Hose adapter
MB990925Bearing and oil
seal installer setRemoval of wheel bearing
Page 951 of 1449
REAR AXLE -Special Tools27B-5
Tool UseName Number
MB991115Oil seal installerPress-fitting of oil seal
(AYC differential: used in combination with
MB990938)
MD998812Installer capPress-fitting of oil seal
(torque transfer mechanism of vehicles with
AYC)
MD998813Installer100
MD998829Installer adapter
(60)
MB990767Front hub and
flange yoke holderRemoval, installation of the drive shaft nut
A
B
MB990241
A: MB990242
B: MB990244Rear axle shaft
puller
A:Puller shaft
B:Puller barDRemoval of drive shaft
DRemoval of rear hub assembly
MB991354Puller body
A
CB
00005697
A: MB991017
B: MB990998
C: MB991000A,B: Front hub re-
mover and in-
staller
C: SpacerDTemporary fixing of wheel bearing
DMeasurement of wheel bearing rotation
starting torque
DMeasurement of wheel bearing axial play
Use MB991000 (component of MB990998)
for the spacer.
Page 952 of 1449
REAR AXLE -Special Tools27B-6
ToolNumberNameUse
MB990685Torque wrenchMeasurement of the starting torque of wheel
bearing
MB990326Preload socket
MB991113 or
MB990635Steering linkage
pullerDisconnection of ball joint
MB990641Lower arm bush
(A) remover & in-
stallerRemoval and press-fitting of differential
support member bush
MB991439Bush remover &
installerRemoval and press-fitting of differential
support arm bush
MB991460PlugPrevention of differential oil from being
discharged and entry of foreign matter
differential>
MB990909Working baseSupporting of the differential carrier
MB991116AdapterSupport of differential carrier assembly
MB990810Side bearing pullerDRemoval of the side bearing inner race
DRemoval of the companion flange
Page 961 of 1449

REAR AXLE -Troubleshooting 27B-15
INSPECTION PROCEDURE 6
Rear tires are noisy during low-speed cornering.
Vehicle skews.
Probable cause
The hydraulic unit or torque transfer differential is probably defective.DDefective hydraulic unit
DDefective torque transfer differential
NOTE
This symptom is limited only when the diagnosis code is correct.
NG
Replace the hydraulic unit. (Refer to
P.27B-61.)
NG
Add fluid. (Refer to P.27B-19.)
OKRepair
Check the trouble symptom.NO
Replace the torque transfer differential.
OK
Is foreign matter trapped in the hydrau-
lic line?YES
Repair
Check the fluid level.
(Refer to P.27B-19.)Check the hydraulic pressure line for
leak.
OK
Check hydraulic pressure.
(Refer to P.27-21.)NGBleed the system of air.
(Refer to P.27-19.)
Check the AYC for operation.
(Refer to P.27B-20.)Check the trouble symptom. OK
NG
NGNG
INSPECTION PROCEDURE 7
Noise is produced from the torque transfer differential
during turning
Probable cause
The torque transfer differential is probably defective.DDefective torque transfer differential
NOTE
This symptom is limited only when the diagnosis code is correct.
NG
Replace the gear oil of the torque transfer differential. (Refer to
P.27B-17.)
Replace the gear oil of the torque transfer differential. (Refer to
P.27B-17.)Normal
Replace the gear oil of the torque transfer differential. (Refer to
P.27B-17.)
Replace the torque transfer differential.
Check the trouble symptom.
OKNG
NG
MUT-IIActuator test
DNo. 06 Clutch operation check (left side) 5 times
DNo. 07 Clutch operation check (right side) 5 times
DSteering wheel on neutral position
DDrive straight in 20 km/h or less
MUT-IIActuator test
DNo. 06 Clutch operation check (left side) 5 times
DNo. 07 Clutch operation check (right side) 5 times
DSteering wheel on neutral position
DDrive straight in 20 km/h or less
Check the trouble symptom.
Normal
Page 966 of 1449

REAR AXLE -On-vehicle Service27B-20
6. Remove the cap of the left bleeder screw on the torque
transfer differential and connect a vinyl hose.
7. Gradually turn the steering wheel clockwise from the
straight-ahead position. At this time, loosen the left bleeder
screw and check that fluid is discharged with air.
8. After air has been completely discharged, tighten bleeder
screw and turn the steering wheel in the straight-ahead
position.
Caution
While the system is being bled of air, add fluid as
necessary to ensure that it is left in the oil reservoir
during the entire procedure.
9. Repeat steps 6 and 7 two to three times until no air
bubbles are recognized in the fluid that comes out. Then,
tighten the bleeder screw to the specified torque.
Tightening torque: 9±1 N·m
10. Perform steps 5 through 8 for the right bleeder screw.
Note, however, that the steering wheel should be turned
conterclockwise.
11. When removing the hydraulic unit, bleed the fluid line
in ACD side. (Refer to GROUP 22 – On-vehicle Service.)
12. After the system has been completely bled of air, check
for the fluid level. (Refer to P. 27B-19.)
Caution
If the system is not completely bled of air, the hydraulic
unit could generate noise, degrading pump durability.
AYC OPERATION CHECK
1. Lift up the vehicles.
2. Set the MUT-IIto the 16-pin diagnosis connector.
Caution
Turn the ignition switch to the LOCK (OFF) position
before connecting or disconnecting the MUT-II.
3. Start the engine.
4. Set the gear to the 2nd gear or above, operate MUT-II,
and check from the service data (Item No.09) that the
wheel speed is within 10 km/h to 20 km/h.
NOTE
(1) Set the steering wheel to the neutral position.
(2) When turning the steering wheel, AYC operates
continually (operation sound from the torque transfer
differential), but it is not system fault. In this case,
set the steering wheel to the neutral position, and
perform the following operations in order to stop the
ACD.
DRelease the clutch.
DSet the gear to ”Neutral”.
DStop the engine.
Bleeder
screw
Vinyl hose