Hummer H3. Manual — part 941

NOISY WHEN COASTING

Noisy When Coasting

INTERMITTENT NOISE

Intermittent Noise

Worn pinion and ring gear

Replace the pinion and the ring gear. Refer to the following:

Differential Case Assembly Disassemble

Differential Case Assembly Assemble

Drive Pinion Bearings Replacement

Worn pinion bearings

Replace the pinion bearings. Refer to Drive Pinion Bearings
Replacement.

Loose pinion bearings

Adjust the pinion bearings preload. Refer to Drive Pinion
Bearings Replacement and to Backlash Inspection and
Adjustment.

Excessive pinion end play

Adjust the pinion end play. Refer to Pinion Depth
Adjustment.

Worn differential bearings

Replace the differential bearings. Refer to Differential Case
Assembly Disassemble and to Differential Case Assembly
Assemble.

Loose differential bearings

Adjust the differential bearing preload. Refer to Backlash
Inspection and Adjustment.

Excessive ring gear runout

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

Low oil level

Fill the fluid level to specifications with the proper lubricant.
Refer to Front Axle Lubricant Level Inspection.

Wrong or poor grade oil

Drain and refill the system with the proper lubricant. Refer to
Front Axle Lubricant Replacement.

Checks

Action

DEFINITION: Noise is audible when slowing down and disappears when driving.
Worn pinion and ring gear

Adjust or replace the pinion and the ring gear. Refer to Drive
Pinion and Ring Gear Replacement.

Pinion and ring gear too
tight

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

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

CONSTANT NOISE

Constant Noise

NOISY ON TURNS

Noisy on Turns

FRONT DRIVE AXLE BEARING WEAR (DIFFERENTIAL CASE/PINION BEARINGS)

Tapered Roller Bearing Diagnosis

Consider the following factors when diagnosing a bearing condition:

Note the general condition of all parts during disassembly and inspection.

Classify the failure with the aid of the illustrations.

Determine the cause.

Make all repairs following recommended procedures.

Checks

Action

Warped ring gear

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

Loose differential case
assembly

Set the differential case assembly to the proper preload and
backlash. Refer to Backlash Inspection and Adjustment.

Checks

Action

Flat spot on the pinion or
the ring gear teeth

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

Flat spot on the pinion
bearing

Replace the bearing. Refer to Drive Pinion Bearings
Replacement.

Worn pinion splines

Replace the pinion. Refer to Drive Pinion and Ring Gear
Replacement.

Checks

Action

Worn differential side gears
and pinions

Replace the differential side gears and pinions. Refer to
Differential Case Assembly Disassemble.

Worn differential spider

Replace the spine gears. Refer to Differential Case
Assembly Disassemble.

Worn axle shaft splines

Replace the axle shaft. Refer to Front Drive Axle Inner
Shaft and Inner Shaft Housing Replacement.

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

Abrasive Roller Wear

Fig. 2: Identifying Abrasive Roller Wear
Courtesy of GENERAL MOTORS CORP.

Pattern on the races and the rollers can be caused by fine abrasives. Clean all of the parts and the
housings. Inspect the seals and the bearings. Replace any leaky, rough or noisy bearings.

Abrasive Step Wear

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

Fig. 3: Identifying Abrasive Step Wear
Courtesy of GENERAL MOTORS CORP.

Pattern on the roller ends can be caused by fine abrasives. Clean all of the parts and the housings.
Inspect the seals and the bearings. Replace any leaky, rough or noisy bearings.

Galling

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3