Hummer H3. Manual — part 1499

Fig. 137: View Of Reverse Idler Gear & Shaft
Courtesy of GENERAL MOTORS CORP.

1. Clean the reverse idler gear and shaft in a suitable solvent and air dry all the parts.

2. Inspect the bushing in the reverse idler gear for the following conditions:

Excessive wear

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Scoring

Pitting

3. Replace the reverse idler gear if the bushing is faulty.

4. Inspect the reverse idler gear shaft for the following conditions:

Excessive wear

Scoring

Pitting

5. Replace the reverse idler gear shaft if it is faulty.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 138: Checking Reverse Idler Gear Radial Clearance
Courtesy of GENERAL MOTORS CORP.

6. Using J 8001-3 or J 26900-12 (1) and J 26900-13 (2), measure the reverse idler gear radial

clearance. See Special Tools.

Specification:

Standard Clearance: 0.040-0.082 mm (0.0016-0.0032 in)

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Maximum Clearance: 0.130 mm (0.0051 in)

7. If the clearance exceeds the maximum, replace the reverse idler gear or the reverse idler

gear shaft.

Countershaft

Fig. 139: Inspection Areas On Countershaft
Courtesy of GENERAL MOTORS CORP.

1. Clean the countershaft in a suitable solvent and air dry all the parts.

2. Inspect the rear bearing race (1) on the countershaft for the following conditions:

Brinelling

Wear

Scoring

3. Inspect the 5th countershaft gear bearing race (2) for the following conditions:

Brinelling

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3