Hummer H3. Manual — part 1507

Fig. 159: View Of Bearings & Spacers
Courtesy of GENERAL MOTORS CORP.

1. Mark or tag the bearings in order to ensure they are properly installed in the correct

location.

2. Clean all of the roller bearings, needle bearings and ball bearings in a suitable solvent and

air dry all the parts.

3. Inspect the bearings and races for the following conditions:

Roughness

Brinelling

Pitting

4. Inspect the cage bearings for being bent or for having damaged cages.

5. Replace the bearings with any of the above conditions.

6. Replace mated bearing parts when only one part is damaged.

7. Inspect the thrust washers for scoring or wear.

8. Replace any faulty thrust washers.

9. Do not file surfaces which have been hardened and precision ground.

SYNCHRONIZERS CLEANING AND INSPECTION

NOTE:

Do not allow the bearings to spin. Turn them slowly by hand.
Spinning the bearings may damage the race and the rollers.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 160: Identifying Stepped Effect On The Synchronizers Teeth
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: When you service the synchronizers, retain them in the order

that they are removed. Mark the parts to ensure the correct
position for inspection and assembly.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

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

2. Inspect the 1st/2nd gear and the 3rd/4th gear synchronizer hubs for a force fit on the output

shaft.

3. Replace synchronizer hubs that do not require a force fit.

4. Inspect the synchronizer hub for wear on the external splines. A stepped effect on the teeth,

due to wear, may cause shift concerns.

5. Replace a worn hub.

6. Correct the cause, such as, but not limited to the following conditions:

Engine related vibrations

Driving at a low speed in a high gear

Defective vibration damper or crankshaft

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 161: Identifying Damage On Synchronizer Sleeve Teeth
Courtesy of GENERAL MOTORS CORP.

7. Inspect the synchronizer sleeve teeth (a) for the following conditions, which may cause shift

concerns:

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3