Mitsubishi Montero (2004+). Manual — part 449
26-1
GROUP 26
FRONT AXLE
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
FRONT AXLE DIAGNOSIS . . . . . . . .
INTRODUCTION TO FRONT AXLE
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . .
FRONT AXLE DIAGNOSTIC
TROUBLESHOOTING STRATEGY . . . . . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
WHEEL BEARING PLAY CHECK . . . . . . .
FRONT AXLE TOTAL BACKLASH CHECK
FRONT AXLE GEAR OIL LEVEL CHECK .
DIFFERENTIAL CARRIER OIL SEAL
REPLACEMENT . . . . . . . . . . . . . . . . . . . . .
SOLENOID VALVE OPERATION CHECK .
HUB AND KNUCKLE ASSEMBLY . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION . . . . . . . . . . . . . . . . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . . . .
DRIVE SHAFT ASSEMBLY. . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . . . .
INSPECTION . . . . . . . . . . . . . . . . . . . . . . .
UJ BOOT (RESIN BOOT) REPLACEMENT
INNER SHAFT ASSEMBLY . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . . . .
DIFFERENTIAL CARRIER AND FREE
WHEELING CLUTCH . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
DIFFERENTIAL CARRIER AND FREE
WHEELING CLUTCH INSPECTION . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
FREE WHEELING CLUTCH DISASSEMBLY
AND ASSEMBLY. . . . . . . . . . . . . . . . . . . . .
DIFFERENTIAL CARRIER DISASSEMBLY
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . .
SOLENOID VALVE AND VACUUM
HOSE . . . . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
FRONT DIFFERENTIAL MOUNT . . . .
REMOVAL AND INSTALLATION . . . . . . . .
DIFFERENTIAL MOUNTING INSULATOR
REPLACEMENT . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . .
GENERAL SPECIFICATIONS . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . .
LUBRICANTS . . . . . . . . . . . . . . . . . . . . . . .
SEALANTS AND ADHESIVES . . . . . . . . . .
GENERAL DESCRIPTION
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FRONT AXLE
26-2
GENERAL DESCRIPTION
M1261000100400
The front axle consists of the front hubs, knuckles,
drive shaft, wheel bearings, ball joints, front differen-
tial, and free wheeling clutch. The features are:
• The structural method of press fitting unit bearing
into front hub is applied.
• The wheel bearing uses a taper roller unit bear-
ing. A rotor for detecting the wheel speed is
press-fitted to the UJ outer wheel.
NOTE: DOJ: Double Offset Joint. UJ: Under cut
Joint.
• Drive shafts incorporate UJ-DOJ-type constant
velocity ball joint has high power transmission
efficiency and reduces vibration and noise.
• A vacuum-type free wheeling clutch has been
adopted in the freewheel mechanism. Its solenoid
valve and actuator Switch powertrain between
RWD and 4WD.
• The differential support method is a four-point
elastic support method which reduce vibration
and noise.
FRONT AXLE DIAGNOSIS
INTRODUCTION TO FRONT AXLE DIAGNOSIS
M1261005500210
The 4WD vehicle incorporates a free wheeling clutch
as the free-wheeling mechanism. The free wheeling
clutch is configured of the mainshaft, shift fork and
clutch gears, etc., and is electrically controlled.
If the clutch does not lock or locks but does not
become free, there may be electrical trouble or the
component may be faulty. Noise from the driveshaft,
inner shaft or differential can be caused by a compo-
nent defect.
FRONT AXLE DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1261005600110
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
front axle fault.
1. Gather information from the customer.
2. Verify that the condition described by the
customer exists.
3. Find the malfunction by following the Symptom
Chart.
4. Verify malfunction is eliminated.
SYMPTOM CHART
M1261005700270
SYMPTOMS
INSPECTION
PROCEDURE
REFERENCE PAGE
Free wheeling
Clutch
Does not lock
1
Locks but does not become free
2
Driveshaft,
inner shaft
Noise during wheel rotation
3
Noise due to excessive wheel play in
turning direction
4
Differential
Constant noise
5
Gear noise while driving
6
Gear noise while coasting
7
Bearing noise while driving or coasting
8
Noise while turning
9
Heat
10
Oil leakage
11
FRONT AXLE DIAGNOSIS
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FRONT AXLE
26-3
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1:Does not Lock
DIAGNOSIS
STEP 1. Check for looseness in the actuator
assembly installation bolt.
Q: Is the actuator assembly installation bolt
loosened?
YES :
Tighten to 17
± 3 N⋅m (13 ± 2 ft-lb). Then go
to Step 7.
NO :
Go to Step 2.
STEP 2. Check the vacuum tank for damage.
Q: Is the vacuum tank damaged?
YES :
Replace the tank. Then go to Step 7.
NO :
Go to Step 3.
STEP 3. Check the check valve for damage.
Q: Is the check valve damaged?
YES :
Replace the valve. Then go to Step 7.
NO :
Go to Step 4.
STEP 4. Check the actuator assembly for
damage.
Q: Is the actuator assembly damaged?
YES :
Replace the actuator assembly. Then go to
Step 7.
NO :
Go to Step 5.
STEP 5. Check the solenoid valve operation.
Refer to
.
Q: Is the solenoid valve operation in good condition?
YES :
Go to Step 6.
NO :
Replace the valve. Then go to Step 7.
STEP 6. Check the shift fork, mainshaft and
clutch gear for damage.
Q: Is the shift fork, mainshaft or clutch gear
damaged?
YES :
Replace the damaged part. Then go to Step
NO :
Go to Step 7.
STEP 7. Retest the system.
Q: Does clutch locks?
YES :
The procedure is complete.
NO :
Repeat from Step 1.
INSPECTION PROCEDURE 2:Locks but does not Become Free
DIAGNOSIS
STEP 1. Check whether foreign material has
entered the mainshaft and clutch gear or clutch
sleeve and clutch gear teeth.
Q: Has foreign material entered the mainshaft and
clutch gear or clutch sleeve and clutch gear teeth?
YES :
Clean the teeth or replace the part. Then go
to Step 2.
NO :
There is no action to be taken.
STEP 2. Retest the system.
Q: Does clutch become free?
YES :
The procedure is complete.
NO :
Repeat from Step 1.
FRONT AXLE DIAGNOSIS
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FRONT AXLE
26-4
INSPECTION PROCEDURE 3:Noise during Wheel Rotation
DIAGNOSIS
STEP 1. Check the housing tube and inner shaft
for bending.
Q: Is the housing tube and inner shaft bent?
YES :
Replace the part. Then go to Step 4.
NO :
Go to step 2.
STEP 2. Check the inner shaft bearing for wear.
Q: Is the inner shaft bearing worn?
YES :
Replace the bearings. Then go to Step 4.
NO :
Go to Step 3.
STEP 3. Check the driveshaft assembly for wear,
damage or bending.
Q: Is the driveshaft assembly worn, damaged or bent?
YES :
Replace the driveshaft assembly. Then go
to Step 4.
NO :
There is no action to be taken.
STEP 4. Retest the system.
Q: Is the abnormal noise eliminated?
YES :
The procedure is complete.
NO :
Repeat from Step 1.
INSPECTION PROCEDURE 4:Noise Due to Excessive Wheel Play in Turning Direction
DIAGNOSIS
STEP 1. Check for play in the inner shaft and side
gear serration, the driveshaft and side gear, or
the driveshaft and drive flange.
Q: Is play found?
YES :
Adjust or replace the part. Then go to Step
NO :
The procedure is complete.
STEP 2. Retest the system.
Q: Is the abnormal noise eliminated?
YES :
The procedure is complete.
NO :
Repeat from Step 1.
INSPECTION PROCEDURE 5: Constant Noise
DIAGNOSIS
STEP 1. Check the oil level.
Remove the filler plug and check the gear oil level.
Q: Is the gear oil level more than 8 mm (0.3 inch) below the
bottom of the filler plug hole?
YES : Check the oil leakage from differential carrier, and
repair if necessary. Then, refill Hypoid gear oil API
classification GL-5 or higher; Above
−23°C(−10°F):
SAE 90, 85W-90, 80W-90, From
−34 to −23°C(−30 to
−10°F): SAE 80W, 80W-90, Below −34°C(−30°F):
SAE 75W. Then go to Step 9.
NO : Go to Step 2.
AC000439
UPPER LIMIT
LOWER LIMIT
AB
8 mm (0.3 in)
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