Isuzu KB P190. Manual — part 122

4B-44 REAR AXLE

Confirmation of Operation

• Using the side gear holder : 5-8840-2682-0,

measure the starting torque of the side gear.

Starting torque : 29-45 N

⋅m (3.0-4.6 kgf⋅m/22-33

lb

⋅ft)

425RW065

Legend

1. Side Gear Holder : 5-8840-2682-0

REAR AXLE 4B-45

TROUBLESHOOTING

Refer to this Section to quickly diagnose and repair
rear 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 five sub-sections:

1. Abnormal Rear Axle Noise

1) Noise when the engine is driving the vehicle

2) Noise when the vehicle is coasting

3) Intermittent noise

4) Noise when the vehicle is turning

5) Constant noise

2. Vibration

3. Oil Leakage

1) Differential carrier leakage

2) Axle case leakage

3) Axle case to inside hub leakage

4) Axle case to inside brake drum leakage

4. Power Not Being Transmitted to the Wheels

(Propeller Shaft Operation is Normal)

4B-46 REAR AXLE

1. ABNORMAL REAR AXLE NOISE

1) Noise when the Engine is Driving the Vehicle

Checkpoint

Trouble

Cause

Countermeasure

Replenish the gear oil

Insufficient gear oil

NG

Differential side bearing

Adjust the differential side

bearing preload

Replace the drive pinion

bearings

Adjust the drive pinion bearing

preload

Replace the gear oil

Loose differential side

bearings

Worn drive pinion bearings

Loose drive pinion bearings

Wrong or poor grade gear oil

Drive pinion to ring gear

backlash

Drive pinion end play

Adjust the backlash

Too much or too little backlash

Continued on the next page

OK

OK

NG

NG

NG

NG

NG

OK

OK

Rear axle gear oil

Replace the differential side

bearings

Worn differential side bearings

NG

REAR AXLE 4B-47

Checkpoint

Trouble

Cause

Countermeasure

Replace the drive pinion and

the ring gear as a set

Excessive ring gear run-out

Replace the drive pinion and

the ring gear as a set

Drive pinion and/or ring gear

damage

NG

NG

Drive pinion and ring gear

Continued from the previous page

Replace the drive pinion and

the ring gear as a set

Worn drive pinion and ring

gear

NG

2) Noise when the Vehicle is Coasting

Checkpoint

Trouble

Cause

Countermeasure

Replace the ring gear and the

pinion as a set

Ring gear damaged

Adjust the backlash

Insufficient backlash

OK

Ring gear

NG

NG

Drive pinion and ring gear

backlash