Hummer H2. Manual - part 2685

Fig. 93: Inspecting High/Low Planetary Carrier 
Courtesy of GENERAL MOTORS CORP. 

1. Clean the high/low planetary carrier in cleaning solvent. Do not disassemble the planetary carrier.  

2. Air dry, and ensure all cleaning solvent is removed from the bearings in the planetary gears (1). Do not 

spin the planetary gears with compressed air.  

3. Inspect the planetary gears for chipped teeth.  

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

5. Inspect the planetary gears for excessive side movement from worn bearings or shafts.  

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

6. Inspect the low range teeth (2) for damage or excessive wear.  

7. Inspect the high range teeth (3) for damage or excessive wear.  

8. Inspect the input seal surface (4) for scoring or excessive wear.  

9. Inspect the thrust washer surface for scoring or excessive wear.  

10. Replace the high/low planetary carrier if any of the above conditions are found.  

11. Inspect the mainshaft front support bearing for the following conditions: 

z

Scoring  

z

Pitting  

z

Brinelling  

z

Excessive wear  

12. Replace the mainshaft front support bearing if it is faulty. Refer to Transfer Case Disassemble and 

Transfer Case Assemble .  

13. Inspect the high/low planetary thrust washer for excessive wear or scoring.  

14. Replace the thrust washer if it is faulty.  

Differential Components 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

Fig. 94: Inspecting Planetary Differential 
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 or 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. 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

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 washers for excessive wear or scoring.  

12. Replace the thrust washers if they are faulty.  

Fig. 95: Inspecting Teeth On Front Sun Gear, Rear Sun Gear & Inner Lockup Hub 
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 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2