Isuzu KB P190. 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