Hummer H3. Manual — part 1500

Wear

Scoring

Fig. 140: Checking Radial Clearance For 5th Countershaft Gear
Courtesy of GENERAL MOTORS CORP.

4. Measure the radial clearance for 5th countershaft gear.

1. Place the 5th countershaft gear, with the needle roller bearing, on the countershaft

journal.

2. Use J 8001-3 or J 26900-12 (1) and J 26900-13 (2). See Special Tools.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

3. Position J 8001-3 or J 26900-12 on the gear. See Special Tools.

4. Move the gear up and down.

Specification:

Standard Clearance: 0.015-0.068 mm (0.0006-0.0027 in)

Maximum Clearance: 0.160 mm (0.0063 in)

5. If the clearance exceeds the maximum, replace the gear, the roller bearing or the

countershaft.

Fig. 141: Measuring Outer Diameter Of Countershaft Journal
Courtesy of GENERAL MOTORS CORP.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

6. Using a micrometer, measure the outer diameter of the countershaft journal.

Specification: Minimum diameter: 29.860 mm (1.1756 in)

7. Inspect all of the countershaft gears for being faulty following the gear inspection steps.

8. Replace the countershaft if it is faulty.

Input Shaft

Fig. 142: View Of Input Shaft & Synchronizer Blocking Ring Surface Inspection
Areas
Courtesy of GENERAL MOTORS CORP.

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

2. Inspect the pilot bearing journal (a) for wear or scoring.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

3. Inspect the clutch disc splines (b) for wear. Steps in the splines may cause concerns with

clutch operation.

4. Inspect the synchronizer blocking ring surface (c) for the following conditions:

Grooves

Excessive wear

Heat marks

Scoring

5. Inspect the output shaft front support bearing journal (d) for the following conditions:

Brinelling

Pitting

Excessive wear

6. Inspect the gear teeth and selector teeth for being faulty following the gear inspections steps.

7. Replace the input shaft if any of the above conditions are found.

Gears

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3