Hummer H3. Manual — part 1525
12. Install the 3rd/4th synchronizer hub retaining ring.
Fig. 224: View Of 1st/2nd Synchronizer Hub Assembly, 2nd Gear & Bearing
Courtesy of GENERAL MOTORS CORP.
13. Install the 2nd gear bearing (123) and the 2nd gear (120) on the rear of the output shaft.
14. Remove the 1st gear blocking rings from the 1st/2nd synchronizer assembly. The rings will
be installed after pressing on the hub.
15. Install the 1st/2nd synchronizer hub assembly (215) on the output shaft, with the shift fork
side of the reverse gear toward 2nd gear.
2007 Hummer H3
2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3
Fig. 225: Locating 1st/2nd Synchronizer Assembly
Courtesy of GENERAL MOTORS CORP.
16. Using a hydraulic press, press the 1st/2nd synchronizer assembly onto the output shaft.
Support the synchronizer hub on the center flange.
Align the tabs of the blocking rings to the notches in the synchronizer hub and the 2nd
speed gear.
2007 Hummer H3
2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3
Fig. 226: Checking 2nd Gear Axial Play
Courtesy of GENERAL MOTORS CORP.
17. Using J 8001-3 or J 26900-12 (1) and J 26900-13 (2), measure the 2nd 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.
2007 Hummer H3
2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3
2. Zero the gage.
3. Lift up on the gear to measure the clearance.
18. If the clearance exceeds the maximum, ensure the hub is installed completely.
19. If the clearance exceeds the maximum, inspect the 2nd gear, the output shaft or the 1st/2nd
synchronizer hub for wear.
20. If clearance is lower than the standard clearance, inspect the 2nd gear, the output shaft or
the 2nd/3rd synchronizer hub for burrs.
21. Repair or replace the damaged or worn component.
2007 Hummer H3
2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3
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