Hummer H3. Manual — part 940

10

Bracket - Mounting

11

Seal Assembly - Shaft

12

Bearing Assembly - Shaft

13

Housing - Support

14

Pin - Locating

15

Gasket - Tube to Support

16

Washer - Thrust

17

Bearing Assembly - Shaft

18

Connector - Shaft

19

Bearing Assembly - Shaft

20

Washer - Thrust

21

Shaft - Output

22

Tube

23

Bolt - Tube to Support

24

Bolt - Tube to Carrier Assembly

25

Gasket - Tube to Carrier Assembly

26

Gasket - Cover Pan

27

Cover Assembly - Pan

28

Washer - Fill Plug

29

Plug - Fill

30

Bolt - Cover Pan

31

Spacer - Pinion Bearing

32

Bearing Assembly - Pinion Head

33

Shim - Pinion Bearing

34

Ring and Pinion Gear

35

Screw - Differential Case Cross Pin

36

Washer - Differential Side Gear Thrust

37

Gear - Differential Case

38

Pin - Differential Cross

39

Gear - Differential Pinion

40

Washer - Differential Pinion Gear Thrust

41

Gear - Differential Side

42

Washer - Differential Side Gear Thrust

43

Gear - Differential Pinion

44

Washer - Differential Pinion Gear Thrust

45

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - FRONT 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 exist. Reviewing the Description and Operation information will
also help you determine if the condition described by the customer is normal operation. Refer to
Symptoms - Front Drive Axle in order to identify the correct procedure for diagnosing the
system and where the procedure is located.

SYMPTOMS - FRONT DRIVE AXLE

Before beginning diagnosis, review the system description and operation in order to familiarize
yourself with the system functions. Refer to Front Drive Axle Description and Operation.

Classifying the Symptom

Front Drive Axle symptoms can usually be classified into the following categories:

Leaks

Noises

Vibrations

Bolt - Differential Carrier Bearing Cap

46

Cap - Differential Carrier Bearing

47

Bolt - Ring Gear

48

Shim - Differential Bearing

49

Bearing Assembly - Differential Case

50

Case - Differential

51

Bearing Assembly - Differential Case

52

Shim - Differential Bearing

53

Plug Assembly - Drain

54

Bushing - Mounting

55

Bolt - Mounting Bracket

56

Bracket - Mounting

57

Seal Assembly - Shaft

58

Bearing Assembly - Shaft

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

Leak and noise related symptoms are diagnosed within the Front Drive Axle section. For
vibration related symptoms, refer to Diagnostic Starting Point - Vibration Diagnosis and
Correction .

Visual/Physical Inspection

Inspect the system for loose or missing fasteners.

Inspect the system for loose or leaking components.

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

Symptoms List

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

Front Drive Axle Noises

Noisy in Drive

Noisy When Coasting

Intermittent Noise

Constant Noise

Noisy on Turns

Front Axle Lubricant Leak Diagnosis

FRONT 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

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 ring and pinion gear
replacement or adjustment, depending on the mileage of the gear set.

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

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 front axle side bearing. This noise can be confused with front wheel bearing noise. Inspect
and replace the bearings and the affected components as required.

Front Wheel Bearing Noise

A rough front 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 and/or noisy wheel bearing can be heard by spinning the 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 the differential case assembly and replace the components as necessary.

Backlash Clunk

Excessive backlash clunk under acceleration or de-acceleration 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
Inspection and Adjustment.

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3