Hummer H3. Manual — part 1462

8: This step inspects for the correct type of transmission fluid. The transmission uses a
special fluid. If the incorrect fluid was used, there may have been an overheating condition.
Overheating may cause damage to the transmission components.

10: This step inspects for noise coming into the driver compartment. Improper sealing of the
shift tower may be allowing normal transmission noise to be heard by the driver.

16: This step tests to determine if clutch components are making the noise. Depress the
clutch pedal slowly and listen for the change in noise. If the noise changes while pressing the
pedal, the transmission component is faulty. If the noise does not change until the clutch is
completely disengaged, it may be a faulty clutch component.

Transmission Noisy

Step

Action

Yes

No

DEFINITION: The transmission is making a noise. The different noises may be a whine or a
growl caused by faulty bearings or gears. The noise may also be caused by a faulty
component, causing a vibration noise or rattle.

1

Did you review the Symptoms - Manual
Transmission and perform the necessary
inspections?

Go to Step 2

Go to Symptoms
- Manual
Transmission

2

Is the noise present at a certain road speed
or with a certain load?

Go to Step 3

Go to Step 4

3

Inspect for the correct driveline angle.
Refer to Driveline Working Angles
Measurement .
Did you find and repair the condition?

Go to Step 19

Go to Step 4

4

Is the noise present in all gears?

Go to Step 6

Go to Step 5

5

Is the noise present in just one gear?

Go to Step 18

Go to Step 6

6

Inspect the transmission fluid level.
Is the fluid level correct?

Go to Step 8

Go to Step 7

7

Add transmission fluid. Refer to
Transmission Fluid Replacement.
Did you find and repair the condition?

Go to Step 19

Go to Step 8

8

Inspect the transmission for the correct
fluid type. Refer to Lubrication
Specifications.
Is the transmission fluid the correct type?

Go to Step 10

Go to Step 9

9

Drain and fill the transmission with the
correct type fluid. Refer to Transmission

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fluid Replacement.
Did you find and repair the condition?

Go to Step 19

Go to Step 10

10

Inspect the shift tower boot.
Is the closeout boot loose or damaged?

Go to Step 11

Go to Step 12

11

Position and tighten the shift tower boot
to specifications. Refer to Control Lever
and/or Boot Replacement.
Did you find and repair the condition?

Go to Step 19

Go to Step 12

12

Is the vehicle equipped with a transfer
case?

Go to Step 13

Go to Step 14

13

Engage the transfer case in the different
modes.
Is the noise still present or the same?

Go to Step 14

Go to Symptoms
- Transfer Case

14

1. Inspect for engine to transmission

alignment.

2. Inspect for loose transmission

mounting bolts.

Are there any loose transmission mounting
bolts?

Go to Step 15

Go to Step 16

15

Replace and tighten the transmission
mounting bolts. Refer to Transmission
Mount Replacement.
Is the noise still present?

Go to Step 16

Go to Step 19

16

With the engine operating, depress the
clutch pedal.
Is the noise still present?

Go to Step 17

Go to Step 18

17

1. Remove the clutch. Refer to Clutch

Assembly Replacement .

2. Inspect the following components

for being the cause of the noise:

The release bearing

The pilot bearing

The pressure plate

The clutch disc

The engine crankshaft end play

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

TRANSMISSION DOES NOT SHIFT INTO ONE GEAR

Diagnostic Aids

If the transmission shifts into gear and then jumps out of gear, refer to Transmission Jumps Out
of Gear. If the vehicle is equipped with a transfer case, during certain load conditions, the
transfer case may fail. If it is an intermittent condition, other driveline components may be faulty.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2: This step is to confirm that the clutch is not slipping. During certain conditions, the clutch
may slip and feel as though the transmission is not in gear.

3: A static shift test is performed by shifting into all gears with the engine not operating.
While performing the test, you should note how the shift lever movement feels. Also, feel
for the shift rails moving freely, the detent plungers operating when coming out of a gear
and going in the next gear and the synchronizer sleeve movement.

5: A dynamic shift test is performed by shifting into all gears with the engine operating. Test
for the correct mesh of the synchronizers sleeve and the speed gear selector teeth. Move the
shift lever and feel for the synchronizer sleeve to just release from the gear, then let up on
the clutch pedal. Depress the clutch pedal and move the shift lever to engage that gear again,
to ensure full travel of the shift components.

Transmission Does Not Shift into One Gear

Did you find and repair the condition?

Go to Step 19

Go to Step 18

18

1. Remove the transmission. Refer to

Transmission Replacement.

2. Disassemble the transmission. Refer

to Transmission Disassemble. Use
the information in the Cleaning and
Inspection section to determine if
any of the transmission components
are faulty.

Did you find and repair the condition?

Go to Step 19

-

19

Operate the system in order to verify the
repair.
Did you correct the condition?

System OK

Go to Step 1

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Step

Action

Yes

No

DEFINITION: The shift lever will not move into a particular gear position or when it is in
a gear position, power is not delivered through the transmission.

1

Did you review the Symptoms - Manual
Transmission and perform the necessary
inspections?

Go to Step 2

Go to Symptoms
- Manual
Transmission

2

Inspect the clutch system for slipping.
Refer to Clutch Slipping .
Is the clutch operating properly?

Go to Step 2

Go to Clutch
Assembly
Replacement

3

1. Perform a static shift test on the

transmission.

2. Test for the following conditions:

Blockage, preventing full shift
lever movement

Excessive movement in the shift
lever

Binding in the shift lever

Detent plungers or shift rails
binding

Synchronizer sleeve moving on
the hub and pressure pieces

Were you able to shift into the gear
position that has the concern?

Go to Step 5

Go to Step 4

4

Remove the shift control housing and
inspect for worn or faulty components.
Refer to Control Lever and/or Boot
Replacement.
Did you find and repair the condition?

Go to Step 8

Go to Step 5

5

1. Perform a dynamic shift test on the

transmission.

2. Test for the following conditions:

Detent plungers or shift rails
binding

Synchronizer sleeve binding

Synchronizer sleeve engaging

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3