Hummer H3. Manual — part 1524

Courtesy of GENERAL MOTORS CORP.

2. Remove the sleeve from the 3rd/4th synchronizer assembly.

3. Position the synchronizer hub and 3rd gear blocking rings on the output shaft. The smooth

side of the hub goes forward, the 4th gear side.

4. Using a hydraulic press, install a new 3rd/4th synchronizer hub on the output shaft.

Support the synchronizer hub on the center flange with a suitable tube.

Align the blocking rings with the hub and the 3rd gear while pressing.

Fig. 221: Measuring 3rd Gear Axial Play
Courtesy of GENERAL MOTORS CORP.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

5. Using J 8001-3 or J 26900-12 (1) and J 26900-13 (2), measure the 3rd gear axial play. See

Special Tools.

Specification:

Standard Clearance: 0.10-0.25 mm (0.0039-0.00098 in)

Maximum Clearance: 0.30 mm (0.0118 in)

1. Position J 8001-3 or J 26900-12 (1) on the top of the gear teeth. See Special Tools.

2. Zero the gage.

3. Lift up on the gear to measure the clearance.

6. If the clearance exceeds the maximum, ensure the hub is installed completely.

7. If the clearance exceeds the maximum, inspect the 3rd gear, the output shaft or the 3rd/4th

synchronizer hub for wear.

8. If clearance is lower than the standard clearance, inspect the 3rd gear, the output shaft or the

3rd/4th synchronizer hub for burrs.

9. Repair or replace the damaged or worn component.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 222: Identifying 3rd/4th Synchronizer Sleeve
Courtesy of GENERAL MOTORS CORP.

10. Install the 3rd/4th synchronizer sleeve on the hub while pushing in on the inserts. The step

shoulder side of the sleeve goes forward to 4th gear.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 223: Locating 3rd/4th Synchronizer Hub Retaining Ring
Courtesy of GENERAL MOTORS CORP.

11. Select the maximum thickness retaining ring for the 3rd/4th synchronizer hub, that will fit in

the groove. Refer to 3rd and 4th Gear Synchronizer Retaining Ring Specifications.

IMPORTANT: The retaining ring is a select fit. Always install a new

retaining ring.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3