Hummer H2. Manual - part 2720

z

Chipped  

z

Debris embedded in the root of the teeth  

3. Replace the annulus gear if it is faulty.  

1. Clean the high/low range shift sleeve in cleaning solvent and air dry.  

2. Inspect the high/low range shift sleeve for the following conditions: 

z

Excessive wear or roughness on the shift fork pad surface (2)  

z

Damaged, chipped or excessive wear on the engagement teeth (3)  

z

Excessive looseness or gouging on the mainshaft splines (1)  

Fig. 57: Identifying High/Low Range Shift Sleeve Inspection Areas 
Courtesy of GENERAL MOTORS CORP.

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - Overhaul - BW 4482-NR4

  

Fig. 58: View Of High/Low Planetary Carrier Inspection Areas 
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. 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - Overhaul - BW 4482-NR4

  

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

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 

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. 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - Overhaul - BW 4482-NR4

  

Fig. 59: Locating Planetary Differential Inspection Points 
Courtesy of GENERAL MOTORS CORP. 

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.  

8. Inspect the planetary differential for distortion.  

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

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - Overhaul - BW 4482-NR4