Hummer H3. Manual — part 916

Grease or oil contamination on the clutch
facings

1. Repair the cause of the oil leak or grease

contamination.

2. Clean the clutch facings.

3. Replace the clutch components if they

will not clean. Refer to Clutch
Assembly Replacement.

Loose or faulty engine mounts

1. Inspect the engine mounts for being

loose or faulty. Refer to Engine Mount
Inspection .

2. Repair or replace the engine mounts, as

required. Refer to Engine Mount
Replacement - Left Side and Engine
Mount Replacement - Right Side .

Clutch pedal sticking

1. Inspect the clutch pedal for correct

operation.

2. Replace the clutch pedal if it is faulty.

Refer to Clutch Pedal Replacement.

Clutch actuator cylinder binding

1. Inspect the clutch actuator cylinder for

the piston seals binding or sticking on
the hub.

2. Replace the clutch actuator cylinder if it

is binding. Refer to Clutch Actuator
Cylinder Replacement.

Clutch master cylinder binding

1. Inspect the clutch master cylinder for the

piston binding or sticking in the
cylinder.

2. Replace the master cylinder if it is

faulty. Refer to Clutch Master
Cylinder Replacement.

Improper clutch installation

1. Inspect for the following conditions:

The pressure plate for distortion
caused by improperly tightening
the pressure plate bolts

The clutch disc for a bent hub
caused by forcing the installation

2007 Hummer H3

2007 TRANSMISSION Clutch - H3

of the transmission

The correct clutch disc

The clutch disc for being installed
backwards

2. Replace the clutch assembly if it is

damaged or if the wrong components
were installed. Refer to Clutch
Assembly Replacement.

Clutch disc binding on the input shaft

1. Inspect for the following conditions:

The input shaft for rust dirt or
debris

The clutch disc for a bent hub

The input shaft for excessive wear
on the splines, causing the clutch
disc to bind

2. Repair or replace the following

components if found faulty.

Clean and lubricate the input shaft.

Replace the clutch assembly if the
clutch disc is faulty. Refer to
Clutch Assembly Replacement.

Replace the transmission input
shaft if it is worn. Refer to
Transmission Disassemble .

Clutch pressure plate damaged

1. Inspect the pressure plate for bent drive

straps caused by improper vehicle use.

2. Replace the clutch assembly if the clutch

pressure plate is damaged. Inform the
customer. Refer to Clutch Assembly
Replacement.

Flywheel improperly machined

1. Inspect the flywheel for being machined

and causing interference with the clutch
disc.

2. Replace the flywheel if it has been

machined. Refer to Engine Flywheel
Replacement (w/Automatic

2007 Hummer H3

2007 TRANSMISSION Clutch - H3

CLUTCH RATTLE

Clutch Rattle

CLUTCH NOISY

Clutch Noisy

Transmission) .

Flywheel uneven

1. Inspect the flywheel surface for being

warped or uneven.

2. Replace the flywheel if it is faulty. Refer

to Engine Flywheel Replacement
(w/Automatic Transmission) .

Cause

Action

DEFINITION: A rattle noise coming from the clutch components with the clutch
disengaged or engaged.
Review the Symptoms - Clutch and perform the necessary inspections.
Idle rattle clutch engaged

Replace the clutch disc, due to faulty
dampener springs. Refer to Clutch Assembly
Replacement.

Clutch is improperly installed

Remove the clutch and install it correctly.
Refer to Clutch Assembly Replacement.

Clutch disc dampener worn or damaged

1. Inspect the clutch disc for a broken or

worn dampener.

2. Replace the clutch assembly. Refer to

Clutch Assembly Replacement.

Clutch disc splines and input shaft splines
worn

1. Inspect the clutch disc hub to input shaft

splines for excessive clearance.

2. Replace the clutch assembly if the clutch

splines are worn. Refer to Clutch
Assembly Replacement.

3. Replace the input shaft. Refer to

Transmission Disassemble .

Cause

Action

DEFINITION: A growl or whine noise is coming from the clutch when engaged or
disengaged.

2007 Hummer H3

2007 TRANSMISSION Clutch - H3

CLUTCH PEDAL SPONGY LOW PEDAL EFFORT

Clutch Pedal Spongy Low Pedal Effort

Review the Symptoms - Clutch and perform the necessary inspections.
Pilot bearing worn or damaged

Replace the pilot bearing. Refer to Clutch
Pilot Bearing Replacement.

Release bearing worn or damaged

Replace the release bearing. Refer to Clutch
Actuator Cylinder Release Bearing
Replacement.

Cause

Action

DEFINITION: The clutch pedal may feel spongy or it requires very little effort to operate.
Review Symptoms - Clutch and perform the necessary inspections.
Air in the hydraulic system

Bleed the clutch hydraulic system. Refer to
Hydraulic Clutch Bleeding.

Master cylinder fluid level low

1. Inspect for leakage in the clutch master

cylinder, hose connections and the clutch
actuator.

2. Repair or replace any faulty

components.

Incomplete pedal return

1. Inspect the pedal for full return.

2. Clear any obstacles that may interfere

with the pedal operation.

3. Adjust the clutch release switch. Refer

to Clutch Pedal Cruise Control
Release Switch Adjustment .

Clutch incorrectly installed

Remove the clutch and install it correctly.
Refer to Clutch Assembly Replacement.

Clutch mounting bolts loose or broken

1. Remove the broken bolts.

2. Replace the broken or loose bolts and

tighten. Refer to Clutch Assembly
Replacement.

Release bearing worn or damaged

Replace the release bearing. Refer to Clutch
Actuator Cylinder Release Bearing
Replacement.

Contaminated hydraulic fluid

1. Inspect for the following conditions:

2007 Hummer H3

2007 TRANSMISSION Clutch - H3