Hummer H2. Manual - part 2684

Fig. 89: Rear Case Half Components 
Courtesy of GENERAL MOTORS CORP. 

1. Clean the rear case half in cleaning solvent, and air dry. 

2. Remove the sealer from the case sealing surfaces.  

3. Inspect the case for being broken or cracked.  

4. Replace the case if it is broken or cracked.  

5. Inspect the sealing surfaces (1) for damage.  

6. Repair small scratches or nicks with a soft stone. 

NOTE:

Refer to Machined Surface Damage Notice in Cautions and Notices.

 

2004 Hummer H2 

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

  

7. Inspect the case threaded bolt holes for damage.  

8. Repair any damaged threads.  

9. Inspect the front output shaft rear bearing bore (2) for the following conditions: 

z

Spun bearing  

z

Cracks  

10. Inspect the rear output shaft rear bearing bore (5) for the following conditions: 

z

Spun bearing  

z

Cracks  

11. Replace the case if the bearing has spun. Refer to Transfer Case Disassemble and Transfer Case 

Assemble .  

12. Inspect the retaining ring (6) for the rear output shaft rear bearing for being bent or twisted.  

13. Replace a faulty retaining ring.  

14. Inspect the rear output shaft bushing (4) for scoring or wear.  

15. Replace the case if the rear output shaft bushing is faulty. Refer to Transfer Case Disassemble and 

Transfer Case Assemble .  

16. Inspect the shift detent lever shaft bore (3) for the following conditions: 

z

Out of round  

z

Excessive wear  

17. Replace the case if the shift detent lever shaft bore is faulty. Refer to Transfer Case Disassemble and 

Transfer Case Assemble .  

Oil Pump 

 

2004 Hummer H2 

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

  

Fig. 90: Oil Pump Hose & Oil Pump Screen
Courtesy of GENERAL MOTORS CORP. 

1. Remove the oil pump suction hose from the oil pump screen.  

2. Clean the hose and screen in cleaning solvent and air dry.  

3. If the screen is embedded with debris, replace the screen.  

4. Inspect the hose for cracking or tears.  

5. Replace the hose if it is faulty.  

6. Inspect the oil pump for free movement.  

7. Replace the oil pump if there is any binding. Do not disassemble the oil pump. The oil pump is serviced 

as a unit.  

8. Inspect the wear clip on the oil pump.  

9. Replace the oil pump if the wear clip is missing or faulty.  

High/Low Range Components 

Fig. 91: Inspecting Annulus Gear Teeth 
Courtesy of GENERAL MOTORS CORP. 

1. Clean the annulus gear in cleaning solvent and air dry. 

 

2004 Hummer H2 

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

  

2. Inspect the annulus gear teeth for the following conditions: 

z

Damage or excessive wear  

z

Chipped  

z

Debris embedded in the root of the teeth  

3. Replace the annulus gear if it is faulty.  

Fig. 92: Inspecting High/Low Range Shift Sleeve 
Courtesy of GENERAL MOTORS CORP. 

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) 

 

2004 Hummer H2 

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