General Description; Diagnosis - Isuzu 1999 RODEO Workshop Manual

4C–2
DRIVE SHAFT SYSTEM

General Description

This publication contains essential removal, installation,
adjustment and maintenance procedures.
The front axle utilizes a central disconnect type front
axle/transfer case system.

Diagnosis

Condition
Oil Leak At Front Axle
Oil Leak At Pinion Shaft
Noises In Front Axle Drive Shaft
Joint
"Clank" When Accelerating From
"Coast"
Shudder or Vibration
Acceleration Acceleration
Vibration At Highway Speeds
Noises in Front Axle
Wanders and Pulls
Front Wheel Shimmy
Possible cause
Worn or defective oil seal.
Front axle housing cracked.
Too much gear oil.
Oil seal worn or defective.
Pinion flange loose or damaged.
Broken or worn drive shaft joints and
bellows (BJ and DOJ).
Loose drive shaft joint to output shaft
bolts.
Damaged inner drive shaft joint.
During Excessive drive shaft joint angle.
Worn or damaged drive shaft joints.
Sticking spider assembly (inner drive
shaft joint).
Sticking joint assembly (outer drive
shaft joint).
Out of balance or out of round tires.
Front end out of alignment.
Insufficient gear oil.
Wrong or poor grade gear oil.
Drive pinion to ring gear backlash
incorrect.
Worn or chipped ring gear, pinion
gear or side gear.
Pinion shaft bearing worn.
Wheel bearing worn.
Differential bearing loose or worn.
Wheel bearing preload too tight.
Incorrect front alignment.
Steering unit loose or worn.
Tire worn or improperly inflated.
Front or rear suspension parts loose
or broken.
Wheel bearing worn or improperly
adjusted.
Incorrect front alignment.
Worn ball joint or bush.
Steering unit loose or worn.
Tire worn or improperly inflated.
Shock absorber worn.
The drive axles are completely flexible assemblies,
consisting of inner and outer constant velocity (CV) drive
shaft joints connected by an axle shaft.
For description of front propeller shaft and universal joint,
refer to Front Propeller Shaft in this section.
Replace the oil seal.
Repair or replace.
Correct the oil level.
Replace the oil seal.
Tighten or replace.
Replace the drive shaft joints and
bellows.
Tighten.
Replace.
Repair.
Replace.
Lubricate or replace.
Lubricate or replace.
Balance or replace.
Align.
Replenish the gear oil.
Replace the gear oil.
Adjust the backlash.
Replace the ring gear, pinion gear or
side gear.
Replace the pinion shaft bearing.
Replace the wheel bearing.
Tighten or replace.
Adjust the wheel bearing preload.
Adjust the front alignment.
Tighten or replace.
Adjust the inflation or replace.
Tighten or replace.
Adjust or replace.
Adjust the front alignment.
Replace the ball joint or bush.
Tighten or replace.
Replace or adjust the inflation.
Replace the shock absorber.
Correction