Hummer H3. Manual — part 1680

4. Replace the speed sensor tone wheel if it is faulty. Refer to Transfer Case Disassemble

and Transfer Case Assemble.

5. Inspect the rear output shaft bearing for the following conditions:

Scoring

Pitting

Brinelling

Excessive wear

6. Replace the rear output shaft bearing if it is faulty. Refer to Transfer Case Disassemble

and Transfer Case Assemble.

7. Inspect the mainshaft rear support bushing for the following conditions:

Pitted

Wear

Corrosion

8. Replace the mainshaft rear support bushing if any of the above conditions are found. Refer

to Transfer Case Disassemble and Transfer Case Assemble.

9. Inspect the rear output shaft splines for wear or damage.

10. Inspect the rear output shaft bearing area for a spun bearing.

11. Replace the rear output shaft if any of the above conditions are found.

Shift System Components

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

Fig. 90: Shift System Components
Courtesy of GENERAL MOTORS CORP.

1. Clean the following shift system components in cleaning solvent and air dry.

The lockup mode shift fork (1)

The high/low range shift fork (2)

The shift cam and shaft assembly (3)

The shift fork spring (4)

The shift fork shaft (5)

2. Inspect the shift fork shaft (5) for straightness and excessive wear at the shift fork locations.

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

3. Replace the shift fork shaft if it is not straight or if it is worn excessively.

Fig. 91: Pads On High/Low Range Shift Fork
Courtesy of GENERAL MOTORS CORP.

1. Inspect the pads on the high/low range shift fork for wear.

2. Replace worn pads.

3. Inspect the roller on the shift fork for wear.

4. Inspect the bore for the shift fork shaft for excessive wear.

5. Replace the shift fork if the above conditions are found.

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

Fig. 92: Lockup Mode Shift Fork
Courtesy of GENERAL MOTORS CORP.

1. Inspect the lockup mode shift fork for excessive wear at the lockup collar pads.

2. Inspect the lockup mode shift fork for wear at the shift detent cam follower.

3. Inspect the lockup mode shift fork for cracks.

4. Replace the lockup mode shift fork if any of the above conditions are found.

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3