Hummer H2. Manual - part 2686

following conditions: 

z

Chipped teeth  

z

Excessively worn gear surfaces 

Slight wear marks are normal. 

z

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.  

 

2004 Hummer H2 

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

  

Fig. 96: Lockup Shift Assembly 
Courtesy of GENERAL MOTORS CORP. 

1. If necessary, disassemble the lockup shift assembly. Refer to Transfer Case Disassemble and Transfer 

Case Assemble .  

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

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

z

Chipped teeth  

z

Excessively worn gear surfaces 

Slight wear marks are normal. 

z

Debris embedded in the root of the teeth  

4. Replace the lockup shift assembly if it is faulty. The lockup shift assembly components are not serviced 

separately.  

Drive Chain and Sprockets 

 

2004 Hummer H2 

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

  

Fig. 97: Drive Chain, Drive Sprocket & Driven Sprocket 
Courtesy of GENERAL MOTORS CORP. 

1. Clean the drive chain (1), drive sprocket (2), and driven sprocket (3) in cleaning solvent and air dry.  

2. Inspect the drive chain (1) for the following conditions: 

z

Loose link pins  

z

Binding or stiff links  

z

Debris embedded in the links  

z

Worn teeth surfaces  

3. Replace the chain if any of the above conditions are found.  

4. Inspect the driven sprocket (3) and the drive sprocket (2) for the following conditions: 

z

Chipped teeth  

z

Excessively worn gear surfaces 

 

2004 Hummer H2 

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

  

Slight wear marks are normal. 

z

Debris embedded in the root of the teeth  

5. Inspect the drive sprocket (2) for the following conditions: 

z

Lockup shift engagement teeth for chipping  

z

Lockup shift engagement teeth for excessive wear  

6. Inspect the drive sprocket bushing for the following conditions: 

z

Excessive wear  

z

Scoring  

7. Replace the sprockets if any of the above conditions are found. The chain and sprockets may be replaced 

separately.  

Mainshaft 

Fig. 98: Front Support Bearing, Drive Gear Bushing, Front Sun Gear & Rear Support Bushing 
Courtesy of GENERAL MOTORS CORP. 

1. Clean the mainshaft in cleaning solvent.  

2. Clean the mainshaft oil galleries (1) and air dry. 

IMPORTANT: Do not attempt to smooth any roughness in the bearing journals.

 

2004 Hummer H2 

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