Page 565 of 6020
FRONT WHEEL DRIVE 4C1-61
Preload Adjustment
Tighten the hub nut at 29 N⋅m (3.0 kgf ⋅m / 22 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 (kgf/lb)
New bearing and New oil seal 22 - 27
(2.2 - 2.8 / 4.9 - 6.2)
Used bearing and New oil seal 1
4 - 20
( 1 .4 - 2.0 / 3. 1 - 4.5)
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 5 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, 0.0 11, 0.020, 0.039)
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Page 566 of 6020
4C1-62 FRONT WHEEL DRIVE
24. Cover Assembly
Align stopper nails to grooves of body.
25. Bolt
Torque N ⋅m (kgf ⋅m/lb ⋅in)
1 2 ( 1.2 / 104)
• Refer to SECTION 3E “W HEELS AND TIRES” for wheel
install procedure.
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ISUZU KB P190 2007
Page 567 of 6020
FRONT WHEEL DRIVE 4C1-63
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. W anders 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. W anders and pulls
6. Front wheel shimmy
Propeller shaft
1 . Noise
2. Vibration
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ISUZU KB P190 2007
Page 568 of 6020
4C1-64 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
W orn or improperly inflated
OK NG
NG
OK
OK
OK
W heel bearing preload
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ISUZU KB P190 2007
Page 569 of 6020
FRONT WHEEL DRIVE 4C1-65
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
W orn or improperly adjusted
OK
OK NG
NG
NG
OK
W heel bearing
Tighten or replace
Loose or worn
NG
Shock absorber
Replace the shock absorber
Worn
Tire
Replace or adjust the inflation
W orn or improperly inflated
OK
NG
NG
OK
Steering unit
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ISUZU KB P190 2007
Page 570 of 6020
4C1-66 FRONT WHEEL DRIVE
4× 4 MODEL
1. OIL LEAK AT FRONT AXLE
Checkpoint Trouble Cause Countermeasure
Front axle housingRepair or replaceCracked
Replace the oil sealW orn or defective oil seal
NG
NG
OKOil seal
2. OIL LEAK AT PINION SHAFT
Oil sealReplace the oil sealW orn 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)
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ISUZU KB P190 2007
Page 571 of 6020
FRONT WHEEL DRIVE 4C1-67
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
W heel bearingWorn
Pinion shaft bearingWorn
W orn or chipped
W rong 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
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ISUZU KB P190 2007
Page 572 of 6020
4C1-68 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
Tire
W orn or improperly inflated
NG
NG
OK
OK
W heel bearing preload
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ISUZU KB P190 2007
