Content .. 847 848 849 850 ..

Hummer H2. Manual - part 849

Washer

Bolt

Wheel Speed Sensor Shim

Wheel Speed Sensor

Bolt

Nut

Rear Axle Housing

Clip

Connector

Differential Drive Pinion Gear Bearing Spacer

Differential Drive Pinion Gear Outer Bearing Cup

Differential Drive Pinion Gear Outer Bearing

Differential Drive Pinion Gear Oil Seal

Differential Drive Pinion Gear Yoke

Differential Drive Pinion Gear Washer

Differential Drive Pinion Gear Nut

Differential Carrier Drain Plug

Differential Drive Pinion Gear Inner Bearing Cup

Differential Drive Pinion Gear Inner Bearing

Differential Drive Pinion Gear Bearing Shim

Differential Drive Pinion Gear

Differential Ring Gear

Differential Bearing Adjuster Nut

Differential Bearing Cup

Differential Bearing

Differential Bearing Adjuster Nut Lock

Bolt

Differential Pinion Gear Shaft Lock Bolt

Differential Bearing Cap Bolt

Differential Bearing Cap

Differential Pinion Gear Shaft

Differential Case

Bolt

Differential Bearing Cap

Differential Coil Lock

Bolt

Rear Axle Housing Cover Gasket

Rear Axle Housing Cover

Brake Pipe Clip

Bolt

2004 Hummer H2

2004 DRIVELINE/AXLE Rear Drive Axle - Hummer H2

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - REAR DRIVE AXLE

Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the Description and
Operation information will help you determine the correct symptom diagnostic procedure when a malfunction
exists. Reviewing the description and Operation information will also help you determine if the condition
described by the customer is normal operation. Refer to Symptoms - Rear Drive Axle in order to identify the
correct procedure for diagnosing the system and where the procedure is located.

SYMPTOMS - REAR DRIVE AXLE

Review the system and operation in order to familiarize yourself with the system functions. Refer to Rear
Drive Axle Description and Operation .

Rear Axle Noise

The proper diagnosis is an important part of rear axle repair. In axle work, one of the most difficult conditions

Bolt

Differential Carrier Fill Plug

Differential Side Gear Thrust Washer

Differential Side Gear

Differential Pinion Gear Thrust Washer

Differential Pinion Gear

Differential Side Gear

Differential Side Gear Thrust Washer

Differential Pinion Gear

Differential Pinion Gear Thrust Washer

Differential Carrier Lock Pin

Locking Differential Clutch Spring Retainer

Locking Differential Clutch Spring

Locking Differential Ball Bearing Plate - Inboard

Locking Differential Ball Bearing Assembly

Locking Differential Ball Bearing Plate - Outboard

Locking Differential Coil Plate

Locking Differential Coil Assembly

Differential Bearing Assembly

Differential Bearing Race

Differential Bearing Retainer Ring

Differential Bearing

Differential Bearing Cup

Differential Bearing Shim

2004 Hummer H2

2004 DRIVELINE/AXLE Rear Drive Axle - Hummer H2

to diagnose is noise. Locating a broken axle shaft or broken differential gear presents little or no problems, but
locating and isolating axle noise can be an entirely different matter.

Any gear driven unit, especially an automotive drive axle where the engine torque multiplication occurs at a 90
degree turn in the driveline, produces a certain amount of noise. Therefore, an interpretation must be made for
each vehicle in order to determine where the noise is normal or if a problem actually exists. A certain amount of
noise must be expected and cannot be eliminated by conventional repairs or adjustment.

Normal axle noise can be described as a slight noise heard only at a certain speed or under unusual or remote
conditions. For example, the noise tends to reach a peak at speeds from 60-100 km/h (40-60 mph) depending on
road and load conditions, or on gear ratio and tire size. This slight noise is in no way indicative of trouble in the
axle assembly.

Driveline noises may confuse even the best technician. Vehicle noises coming from tires, transmission,
propeller shaft, universal joints, and front or rear wheel bearings are often mistaken for axle noise.

Visual/Physical Inspection

Inspect the system for loose or missing fasteners.

Inspect the system for leaking components.

Inspect the system for obvious damage or conditions which may cause the symptom.

Symptom List

Refer to a system diagnostic procedure from the following list in order to diagnose the symptom:

Rear Drive Axle Noises

Noisy in Drive

Noisy When Coasting

Intermittent Noise

Constant Noise

Noisy on Turns

REAR DRIVE AXLE NOISES

Gear Noise

Gear noise or whine is audible from 32-89 km/h (20-55 mph) under 4 driving conditions:

Drive- Acceleration or heavy pull

Road Load-Vehicle driving load or constant speed

Float-Using enough throttle to keep the vehicle from driving the engine, the vehicle slows down
gradually but the engine still pulls slightly

Coast-Throttle is closed and the vehicle is in gear

2004 Hummer H2

2004 DRIVELINE/AXLE Rear Drive Axle - Hummer H2

Gear noise most frequently has periods where the noise is more prominent, usually between 48-64 km/h (30-40
mph) and 80-85 km/h (50-53 mph). Gear whine is corrected by either ring and pinion gear replacement or
adjustment, depending on the mileage of the gearset.

Bearing Noise

Faulty bearings produce a rough growl or grating sound, rather than the whine typical of gear noise. Bearing
noise/hum will pulsate at a constant vehicle speed. This indicates a bad pinion or a bad rear axle side bearing.
This noise can be confused with rear wheel bearing noise. Inspect and replace the bearings and the affected
components as required.

Rear Wheel Bearing Noise

A rough rear wheel bearing produces a noise which continues with the car coasting at low speed and the
transmission in neutral. The noise may diminish some when the brakes are gently applied. The noise may also
change when performing side-to-side maneuvers with the vehicle.

A rough/noisy rear wheel bearing can be heard by spinning the rear wheels by hand and listening at the hubs for
the noise. Inspect and replace the bearings and the affected components as needed.

Knock at Low Speeds

A low speed knock can be caused by a differential case side gear bore that has worn oversize. Inspect the side
gears and differential case and replace the components as necessary.

Backlash Clunk

Excessive backlash clunk under acceleration or deacceleration can be caused by any of the following:

Worn differential pinion shaft

Worn differential pinion and/or side gear teeth

Worn thrust washers

Excessive clearance between the side gears and the axle shafts

Excessive clearance between differential side gears and the bore in the case

Excessive drive pinon and ring gear backlash

Inspect, adjust or replace the affected components as necessary.

NOISY IN DRIVE

Noisy in Drive

Checks

Action

Excessive pinion to ring
gear backlash

Adjust the pinion to ring gear backlash. Refer to Backlash Adjustment .

Worn pinion and ring gear Replace the pinion and the ring gear. Refer to Drive Pinion and Ring Gear

2004 Hummer H2

2004 DRIVELINE/AXLE Rear Drive Axle - Hummer H2

Content .. 847 848 849 850 ..