wheel ISUZU TF SERIES 2004 Workshop Manual

FRONT WHEEL DRIVE 4C1-65


Preload Adjustment
Tighten the hub nut at 29.4 Nm (3 kgfm / 21.716 lb.ft), then
loosen the nut to the full.
Tighten the hub nut at the value given below, using a spring
scale on the wheel pin.
Bearing Preload N(lb)

New bearing and New oil seal 20 - 25 (4.4 - 5.5)
Used bearing and New oil seal 12 - 18 (2.68 - 4.0)
If the measured bearing preload is outside the specifications,
adjust it by loosening or tightening the bearing nut.



21. Lock Washer
Turn the side with larger diameter of the tapered bore to the
vehicle outer side, and attach the washer.
If the bolt holes in the lock plate are not aligned with the
corresponding holes in the nut, reverse the lock plate.
If the bolt holes are still out of alignment, turn in the nut just
enough to obtain alignment,. Screw is to be fastened tightly so
its head may come lower than the surface of the washer.


22. Body Assembly
Apply adhesive (Loctite 15 or equivalent) to the both joining
faces.


23. Snap Ring and Shims
Adjust the clearance between the free wheeling hub body and
the snap ring.
Clearance mm(in)
0 - 0.2 (0 - 0.08)
Adjust Shims Available mm(in)
0.2, 0.3, 0.5, 1.0
(0.008, 0.011, 0.020, 0.039)


24. Cover Assembly
Align stopper nails to grooves of body.

4C1-66 FRONT WHEEL DRIVE

25. Bolt
Torque Nm (kgfm/lbft)
12.0 
2.0 (1.2 
0.2 / 8.7 
1.4)

FRONT WHEEL DRIVE 4C1-67
TROUBLESHOOTING
Refer to this Section to quickly diagnose and repair front axle problems. Each troubleshooting chart has three
headings arranged from left to right.
(1) Checkpoint (2) Trouble Cause (3) Countermeasure
This Section is divided into ten sub-sections:

4




2 Model
1. Wanders and pulls
2. Front wheel shimmy

4




4 Model
1. Oil leak at front axle
2. Oil leak at pinion shaft
3. Noises in front axle drive shaft joint
4. Noises in front axle
5. Wanders and pulls
6. Front wheel shimmy

Propeller shaft
1. Noise
2. Vibration

4C1-68 FRONT WHEEL DRIVE
4





2 Model
1. WANDERS AND PULLS

Checkpoint Trouble Cause Countermeasure


Adjust the wheel bearing
preload

Too tight
NG

Adjust the front alignment

Front alignment

Incorrect


Steering unit

Tighten or replace

Loose or worn
NG NG

Suspension

Tighten or replace


Replace or adjust the inflation


Front or rear suspension parts
loose or broken


Tire

Worn or improperly inflated

OK
NG NG OK OK
OK

Wheel bearing preload

FRONT WHEEL DRIVE 4C1-69
2. FRONT WHEEL SHIMMY

Checkpoint Trouble Cause Countermeasure



Ball joint or bush

Replace the ball joint or bush

Worn


Front alignment

Adjust the front alignment


Adjust or replace


Incorrect


Worn or improperly adjusted

OK
OK NG NG NG
OK
Wheel bearing

Tighten or replace

Loose or worn
NO

Shock absorber

Replace the shock absorber

Worn


Tire

Replace or adjust the inflation

Worn or improperly inflated

OK
NG NG OK

Steering unit

4C1-70 FRONT WHEEL DRIVE
4





4 MODEL
1. OIL LEAK AT FRONT AXLE

Checkpoint Trouble Cause Countermeasure

Front axle housingRepair or replaceCracked
Replace the oil sealWorn or defective oil seal
NG NG
OKOil seal



2. OIL LEAK AT PINION SHAFT

Oil sealReplace the oil sealWorn or defective
Correct the oil levelToo much gear oil
NG NG
OKGear oil level
Pinion flangeTighten or replaceLoose or damaged NG OK



3. NOISES IN FRONT AXLE DRIVE SHAFT JOINT


Replace the drive shaft joints
and bellows

Broken or worn
NG
Drive shaft joints and bellows
(UJ and DOJ)

FRONT WHEEL DRIVE 4C1-71
4. NOISES IN FRONT AXLE

Checkpoint Trouble Cause Countermeasure

Replenish the gear oilInsufficient gear oil NG
Replace the wheel bearing
Replace the pinion shaft
bearing
Replace the ring gear pinion
gear or side gear
Replace the gear oil
Wheel bearingWorn
Pinion shaft bearingWorn
Worn or chipped
Wrong or poor grade gear oil
Ring gear, pinion gear or side
gear
Adjust the backlashDrive pinion to ring gear
backlashToo much or too little backlash
NG NG NG NG NG
OK OK
OK
OK
Oil level
Tighten or replaceDifferential bearingLoose or worn NG OK

4C1-72 FRONT WHEEL DRIVE
5. WANDERS AND PULLS

Checkpoint Trouble Cause Countermeasure


Adjust the wheel bearing
preload

Too tight
NG

Adjust the front alignment

Front alignment

Incorrect


Tighten or replace

Steering unit

Loose or worn
NG NG
OK OK

Tighten or replace


Replace or adjust the inflation


Suspension

Front or rear suspension parts
loose or broken


Tab

Worn or improperly inflated

NG NG
OK OK

Wheel bearing preload

FRONT WHEEL DRIVE 4C1-73
6. FRONT WHEEL SHIMMY

Checkpoint Trouble Cause Countermeasure



Ball joint or bush

Replace the ball joint or bush

Worn


Front alignment

Adjust the front alignment


Adjust or replace


Incorrect


Worn or improperly adjusted

OK
OK NG NG NG
OK
Wheel bearing

Tighten or replace

Loose or worn
NO

Shock absorber

Replace the shock absorber

Worn


Tire

Replace or adjust the inflation

Worn or improperly inflated

OK
NG NG OK

Steering unit

4C1-74 FRONT WHEEL DRIVE
PROPELLER SHAFT
1. NOISE

Checkpoint Trouble Cause Countermeasure

Spider bearingReplaceWorn or jammed
ReplaceDamaged or worn
NG NG
OKYoke spline



2. VIBRATION

Shaft balanceAdjustUnbalance
ReplaceIncorrect
NG NG
OKShaft runout
Transmission rear housing
bushing, transfer case
housing bushing
ReplaceWorn NG OK
Yoke splineReplaceJammed NG OK