Hummer H2. Manual — part 849

12

Washer

13

Bolt

14

Wheel Speed Sensor Shim

15

Wheel Speed Sensor

16

Bolt

17

Nut

18

Rear Axle Housing

19

Clip

20

Connector

21

Connector

22

Differential Drive Pinion Gear Bearing Spacer

23

Differential Drive Pinion Gear Outer Bearing Cup

24

Differential Drive Pinion Gear Outer Bearing

25

Differential Drive Pinion Gear Oil Seal

26

Differential Drive Pinion Gear Yoke

27

Differential Drive Pinion Gear Washer

28

Differential Drive Pinion Gear Nut

29

Differential Carrier Drain Plug

30

Differential Drive Pinion Gear Inner Bearing Cup

31

Differential Drive Pinion Gear Inner Bearing

32

Differential Drive Pinion Gear Bearing Shim

33

Differential Drive Pinion Gear

34

Differential Ring Gear

35

Differential Bearing Adjuster Nut

36

Differential Bearing Cup

37

Differential Bearing

38

Differential Bearing Adjuster Nut Lock

39

Bolt

40

Differential Pinion Gear Shaft Lock Bolt

41

Differential Bearing Cap Bolt

42

Differential Bearing Cap

43

Differential Pinion Gear Shaft

44

Differential Case

45

Bolt

46

Differential Bearing Cap

47

Differential Coil Lock

48

Bolt

49

Rear Axle Housing Cover Gasket

50

Rear Axle Housing Cover

51

Brake Pipe Clip

52

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

53

Bolt

54

Differential Carrier Fill Plug

55

Differential Side Gear Thrust Washer

56

Differential Side Gear

57

Differential Pinion Gear Thrust Washer

58

Differential Pinion Gear

59

Differential Side Gear

60

Differential Side Gear Thrust Washer

61

Differential Pinion Gear

62

Differential Pinion Gear Thrust Washer

63

Differential Carrier Lock Pin

64

Locking Differential Clutch Spring Retainer

65

Locking Differential Clutch Spring

66

Locking Differential Ball Bearing Plate - Inboard

67

Locking Differential Ball Bearing Assembly

68

Locking Differential Ball Bearing Plate - Outboard

69

Locking Differential Coil Plate

70

Locking Differential Coil Assembly

71

Differential Bearing Assembly

72

Differential Bearing Race

73

Differential Bearing Retainer Ring

74

Differential Bearing

75

Differential Bearing Cup

76

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

z

Inspect the system for loose or missing fasteners.

z

Inspect the system for leaking components.

z

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:

z

Rear Drive Axle Noises

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Noisy in Drive

z

Noisy When Coasting

z

Intermittent Noise

z

Constant Noise

z

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:

z

Drive- Acceleration or heavy pull

z

Road Load-Vehicle driving load or constant speed

z

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

z

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:

z

Worn differential pinion shaft

z

Worn differential pinion and/or side gear teeth

z

Worn thrust washers

z

Excessive clearance between the side gears and the axle shafts

z

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

z

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