Hummer H2. Manual — part 33

Axle shaft noise is similar to gear noise and pinion bearing whine. Axle shaft bearing noise will normally
distinguish itself from gear noise by occurring in all driving modes (Drive, cruise, coast and float), and will
persist with transmission in Neutral while vehicle is moving at problem speed.

If vehicle displays this noise condition, remove suspect parts, replace wheel seals and install a new set of
bearings. Re-evaluate vehicle for noise before removing any internal components.

Vibration

Vibration is a high-frequency trembling, shaking or grinding condition (felt or heard) that may be constant or
variable in level and can occur during the total operating speed range of the vehicle.

The types of vibrations that can be felt in the vehicle can d into 3 main groups:

z

Vibrations of various unbalanced rotating parts of the vehicle.

z

Resonance vibrations of the body and frame structures caused by rotating of unbalanced parts.

z

Tip-in moans of resonance vibrations from stressed engine or exhaust system mounts or driveline flexing
modes.

DRIVE AXLE - RWD TROUBLE SHOOTING

DRIVE AXLE (RWD) TROUBLE SHOOTING

NOTE:

This is GENERAL information. This article is not intended to be specific to any
unique situation or individual vehicle configuration. The purpose of this Trouble
Shooting information is to provide a list of common causes to problem
symptoms. For model-specific Trouble Shooting, refer to SUBJECT,
DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing.
For definitions of listed noises or sounds, see DRIVE AXLE - NOISE DIAGNOSIS
under POWERTRAIN.

CONDITION & POSSIBLE CAUSE

CORRECTION

Knocking or Clunking

Differential Side Gear Clearance

Check Clearance

Worn Pinion Shaft

Replace Pinion Shaft

Axle Shaft End Play

Check End Play

Missing Gear Teeth

Check Differential/Replace Gear

Wrong Axle Backlash

Check Backlash

Misaligned Driveline

Realign Driveline

Clinking During Engagement

Side Gear Clearance

Check Clearance

Ring and Pinion Backlash

Check Backlash

Worn/Loose Pinion Shaft

Replace Shaft/Bearing

Bad "U" Joint

Replace "U" Joint

1998 Chevrolet Pickup C1500

GENERAL INFORMATION Trouble Shooting - Basic Procedures

FWD AXLE SHAFTS & CV JOINTS TROUBLE SHOOTING

BASIC FWD AXLE SHAFTS & CV JOINTS TROUBLE SHOOTING CHART

STEERING & SUSPENSION

MANUAL STEERING GEAR TROUBLE SHOOTING

Sticking Slip Yoke

Lube Slip Yoke

Broken Rear Axle Mount

Replace Mount

Loose Drive Shaft Flange

Check Flange

Click/Chatter On Turns

Differential Side Gear Clearance

Check Clearance

Wrong Turn On Plates

(1)

Replace Clutch Plates

Wrong Differential Lubricant

(1)

Change Lubricant

Knock Or Click

Flat Spot on Rear Wheel Bearing

Replace Wheel Bearing

Low Vibration At All Speeds

Faulty Wheel Bearing

Replace Wheel Bearing

Faulty "U" Joint

Replace "U" Joint

Faulty Drive Shaft

Balance Drive Shaft

Faulty Companion Flange

Replace Flange

Faulty Slip Yoke Flange

Replace Flange

(1)

Limited slip differential only.

NOTE:

This is GENERAL information. This article is not intended to be specific to any
unique situation or individual vehicle configuration. The purpose of this Trouble
Shooting information is to provide a list of common causes to problem
symptoms. For model-specific Trouble Shooting, refer to SUBJECT,
DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing.

CONDITION

POSSIBLE CAUSE

Grease Leaks

CV boot torn or cracked

Clicking Noise on Cornering

Damaged outer CV

Clunk Noise on Acceleration

Damaged inner CV

Vibration or Shudder on
Acceleration

Sticking, damaged or worn CV Misalignment or

spring height

NOTE:

This is GENERAL information. This article is not intended to be specific to any
unique situation or individual vehicle configuration. The purpose of this Trouble
Shooting information is to provide a list of common causes to problem

1998 Chevrolet Pickup C1500

GENERAL INFORMATION Trouble Shooting - Basic Procedures

BASIC MANUAL STEERING GEAR TROUBLE SHOOTING CHART

symptoms. For model-specific Trouble Shooting, refer to SUBJECT,
DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing.

CONDITION & POSSIBLE
CAUSE

CORRECTION

Rattle or Chucking Noise in Rack and Pinion

Rack and pinion mounting bracket
loose

Tighten all mounting bolts

Lack of/or incorrect lubricant

Correct as necessary

Steering gear mounting bolts loose

Tighten all mounting bolts

Excessive Play

Front wheel bearing improperly
adjusted

See FRONT SUSPENSION article

Loose or worn steering linkage

See STEERING LINKAGE article

Loose or worn steering gear shift

See MANUAL STEERING GEAR article

Steering arm loose on gear shaft

See MANUAL STEERING GEAR article

Steering gear housing bolts loose

Tighten all mounting bolts

Steering gear adjustment too loose

See MANUAL STEERING GEAR article

Steering arms loose on knuckles

Tighten and check steering linkage

Rack and pinion mounting loose

Tighten all mounting bolts

Rack and pinion out of adjustment

See adjustment in STEERING article

Tie rod end loose

Tighten and check steering linkage

Excessive Pitman shaft-to-ball nut
lash

Repair as necessary

Poor Returnability

Lack of lubricant in ball joint or
linkage

Lubricate and service systems

Binding in linkage or ball joints

See STEERING LINKAGE and SUSPENSION

article

Improper front end alignment

See WHEEL ALIGNMENT article

Improper tire pressure

Inflate to proper pressure

Tie rod binding

Inflate to proper pressure

Shaft seal rubbing shaft

See STEERING COLUMN article

Excessive Vertical Motion

Improper tire pressure

Inflate to proper pressure

Tires, wheels or rotors out of
balance

Balance tires then check wheels and rotors

Worn or faulty shock absorbers

Check and replace if necessary

Loose tie rod ends or steering

Tighten or replace if necessary

1998 Chevrolet Pickup C1500

GENERAL INFORMATION Trouble Shooting - Basic Procedures

POWER STEERING TROUBLE SHOOTING

BASIC POWER STEERING TROUBLE SHOOTING CHART

Loose or worn wheel bearings

See SUSPENSION article

Steering Pulls to One Side

Improper tire pressure

Inflate to proper pressure

Front tires are different sizes

Rotate or replace if necessary

Wheel bearings not adjusted
properly

See FRONT SUSPENSION article

Bent or broken suspension
components

See FRONT SUSPENSION article

Improper wheel alignment

See WHEEL ALIGNMENT article

Brakes dragging

See BRAKES article

Instability

Low or uneven tire pressure

Inflate to proper pressure

Loose or worn wheel bearings

See FRONT SUSPENSION article

Loose or worn idler arm bushing

See FRONT SUSPENSION article

Loose or worn strut bushings

See FRONT SUSPENSION article

Incorrect front wheel alignment

See WHEEL ALIGNMENT article

Steering gear not centered

See MANUAL STEERING GEARS article

Springs or shock

Check and replace if necessary

Improper cross shaft

See MANUAL STEERING GEARS article

NOTE:

This is GENERAL information. This article is not intended to be specific to any
unique situation or individual vehicle configuration. The purpose of this Trouble
Shooting information is to provide a list of common causes to problem
symptoms. For model-specific Trouble Shooting, refer to SUBJECT,
DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing.

CONDITION & POSSIBLE CAUSE

CORRECTION

Rattle or Chucking Noise

Pressure hoses touching engine parts

Adjust to proper clearance

Loose Pitman shaft

Adjust or replace if necessary

Tie rods ends or Pitman arm loose

Tighten and check system

Rack and pinion mounts loose

Tighten all mounting bolts

Free play in worm gear

See POWER STEERING GEAR article

Loose sector shaft or thrust bearing
adjustment

See POWER STEERING GEAR

Free play in pot coupling

See STEERING COLUMN article

Worn shaft serrations

See STEERING COLUMN article

Growl in Steering Pump

1998 Chevrolet Pickup C1500

GENERAL INFORMATION Trouble Shooting - Basic Procedures