Main Shaft Disassemble

Main Shaft Disassemble

Tools Required

J 22912-B Rear Pinion and Axle Bearing Remover

Disassembly Procedure




1. Remove the following components from the rear of the mainshaft (603):
* 5th/reverse drive gear and clutch hub thrust bearing (619)
* 5th/reverse drive gear (620)
* 5th/reverse drive gear and clutch hub inner bearing (621)
* 5th/reverse drive gear and clutch hub thrust bearing (622)
* 5th/reverse drive gear and clutch hub bearing race (623)
* 4th/5th clutch assembly (643)
* 4th/5th/reverse clutch housing fluid passage O-ring seals (604)
2. Remove the following from the front of the mainshaft (603):
* Mainshaft front bearing retaining ring (600)
* Mainshaft front bearing (601)
* Mainshaft fluid passage seal (602)





Important: The 1st/2nd/3rd drive gear (641) does not remove from the mainshaft (603).

3. Using a hydraulic press and J 22912-B, remove the 4th drive gear with clutch hub assembly (642) from the mainshaft (603).
* Protect the end of the mainshaft to avoid damage to the threads.
* Ensure the J 22912-B is under the bearing race. Do not catch on or under the flange on the shaft.




4. Remove the 4th drive gear and clutch hub bearing retaining ring (605).
5. Using a brass drift and hammer, remove the 4th drive gear and clutch hub bearing (606) from the 4th drive gear (607).

Inspection Procedure




1. Inspect the mainshaft (603) for the following conditions:
* Worn or damaged splines
* Bearing journals for excessive wear or damage
* Damaged threads
* Oil passage seal grooves for nicks, scratches, or other damage
2. Inspect the 1st/2nd/3rd drive gear (641) for the following conditions:
* Excessive wear to the teeth
* Chipped teeth
* Cracked teeth
* Looseness on the mainshaft
3. Replace the mainshaft (603) if any of the above conditions are found.




4. Inspect the following components for wear or damage:
* 5th/reverse drive gear and clutch hub thrust bearing (619)
* 5th/reverse drive gear (620)
* 5th/reverse drive gear and clutch hub inner bearing (621)
* 5th/reverse drive gear and clutch hub thrust bearing (622)
* 5th/reverse drive gear and clutch hub bearing race (623)
* Mainshaft front bearing (601)
5. Replace any faulty parts.




6. Inspect the 4th drive gear (607) for the following conditions:
* Excessive wear to the teeth
* Chipped teeth
* Cracked teeth
7. Inspect the 4th drive gear and clutch hub bearing (606) for wear or damage.
8. Replace any faulty parts.