Hummer H2. Manual — part 850

NOISY WHEN COASTING

Noisy When Coasting

INTERMITTENT NOISE

Intermittent Noise

CONSTANT NOISE

Constant Noise

Replacement .

Worn pinion bearings

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

Loose pinion bearings

Adjust the pinion bearings preload. Refer to Pinion Depth 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 Side Bearings

Replacement .

Loose differential bearings Adjust the differential bearing preload. Refer to Differential Side Bearing

Preload 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
Lubricant Level Inspection - Rear Drive Axle .

Wrong or poor grade oil

Drain and refill the system with the proper lubricant. Refer to Lubricant
Replacement - Rear Drive Axle .

Bent axle housing

Replace the axle housing. Refer to Rear Axle Housing 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 Adjustment .

Checks

Action

Warped ring gear

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

Loose differential case
bolts

Tighten differential case bolts to specifications. Refer to Fastener Tightening
Specifications .

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 .

2004 Hummer H2

2004 DRIVELINE/AXLE Rear Drive Axle - Hummer H2

NOISY ON TURNS

Noisy on Turns

WHEEL BEARING WEAR - REAR DRIVE AXLE (TAPERED)

Tapered Roller Bearing Diagnosis

Consider the following factors when diagnosing bearing condition:

z

General condition of all parts during disassembly and inspection

z

Classify the failure with the aid of the illustrations.

z

Determine the cause.

z

Make all repairs following recommended procedures.

Abrasive Roller Wear

Worn axle shaft dowel holes

Replace the axle shaft. Refer to Rear Axle Shaft Replacement .

Worn hub studs

Replace the wheel studs. Refer to Wheel Stud Replacement in Rear
Suspension.

Checks

Action

Worn differential side gears, pinion gears,
thrust washers and/or pinion shaft.

Replace the differential components as necessary. Refer to
the following procedures:

z

Locking Differential Disassemble in Rear Drive
Axle - Locking/Limited Slip Rear Axle

z

Locking Differential Assemble in Rear Drive Axle -
Locking/Limited Slip Rear Axle

Worn axle shaft splines

Replace the axle shaft. Refer to Rear Axle Shaft
Replacement .

2004 Hummer H2

2004 DRIVELINE/AXLE Rear Drive Axle - Hummer H2

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

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

Abrasive Step Wear

2004 Hummer H2

2004 DRIVELINE/AXLE Rear Drive Axle - Hummer H2

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

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

Galling

2004 Hummer H2

2004 DRIVELINE/AXLE Rear Drive Axle - Hummer H2