Isuzu KB P190. Service manual — part 142

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

Worn or improperly inflated

OK

NG

NG

OK

OK

OK

Wheel bearing preload

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

Worn or improperly adjusted

OK

OK

NG

NG

NG

OK

Wheel bearing

Tighten or replace

Loose or worn

NG

Shock absorber

Replace the shock absorber

Worn

Tire

Replace or adjust the inflation

Worn or improperly inflated

OK

NG

NG

OK

Steering unit

4C1-66 FRONT WHEEL DRIVE

4×4 MODEL

1. OIL LEAK AT FRONT AXLE

Checkpoint

Trouble

Cause

Countermeasure

Front axle housing

Repair or replace

Cracked

Replace the oil seal

Worn or defective oil seal

NG

NG

OK

Oil seal

2. OIL LEAK AT PINION SHAFT

Oil seal

Replace the oil seal

Worn or defective

Correct the oil level

Too much gear oil

NG

NG

OK

Gear oil level

Pinion flange

Tighten or replace

Loose 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 4C1-67

4. NOISES IN FRONT AXLE

Checkpoint

Trouble

Cause

Countermeasure

Replenish the gear oil

Insufficient 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 bearing

Worn

Pinion shaft bearing

Worn

Worn or chipped

Wrong or poor grade gear oil

Ring gear, pinion gear or side

gear

Adjust the backlash

Drive pinion to ring gear

backlash

Too much or too little backlash

NG

NG

NG

NG

NG

OK

OK

OK

OK

Oil level

Tighten or replace

Differential bearing

Loose or worn

NG

OK