Hummer H3. Manual — part 1678

Fig. 83: Inspecting Planetary Differential Components
Courtesy of GENERAL MOTORS CORP.

1. Clean the planetary differential in cleaning solvent. Do not disassemble the planetary

differential.

2. Air dry and ensure all cleaning solvent is removed from the bushings in the pinion gears (3).

Do not spin the pinion gears with compressed air.

3. Inspect the pinion gears for chipped teeth.

4. Inspect the pinion gears for debris embedded in the root of the teeth.

5. Inspect the pinion gears for excessive side movement from worn bushings, thrust washers or

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

shafts.

6. Inspect the planetary differential assembly for cracks at the web (1) of the housing.

7. Inspect the thrust washer surface (2) for scoring or excessive wear.

8. Inspect the planetary differential for distortion.

9. Inspect the planetary differential to mainshaft splines for excessive wear.

10. Replace the planetary differential if any of the above conditions are found.

11. Inspect the thrust washer for excessive wear or scoring.

12. Replace the thrust washer if it is faulty.

Fig. 84: Front Sun Gear, Rear Sun Gear And Inner Lockup Hub

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

Courtesy of GENERAL MOTORS CORP.

1. Clean the front sun gear (1), the rear sun gear (2) and the inner lockup hub (3) in cleaning

solvent and air dry.

2. Inspect the teeth on the front sun gear (1), the rear sun gear (2) and the inner lockup hub (3)

for the following conditions:

Chipped teeth

Excessively worn gear surfaces

Slight wear marks are normal.

Debris embedded in the root of the teeth

3. Inspect the thrust washer surfaces for excessive wear or scoring.

4. Replace the front sun gear (1), the rear sun gear (2) and the inner lockup hub (3) if they are

faulty.

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

Fig. 85: View Of Lockup Shift Collar Assembly
Courtesy of GENERAL MOTORS CORP.

1. Disassemble the lockup shift collar assembly, if necessary. Refer to Transfer Case

Disassemble and Transfer Case Assemble.

2. Clean the lockup shift collar assembly components in cleaning solvent and air dry.

3. Inspect the lockup shift hub engagement teeth for the following conditions:

Chipped teeth

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3