B. Mainshaft

^ Tools Required:
- J 36183 Press Tube
- J 36184 Press Tube Adapter
- J 36513 Split Plate
- J 39371 1st/2nd Synchronizer Installer
- J 39442 Press Adapter
- J 39443 Split Plate
- J 39473 Bearing Installer/ Press Adapter
- Hydraulic Press
- V-Blocks

DISASSEMBLE

Important
- Identify and mark blocker rings. DO NOT MIX.

1. Mainshaft large tapered bearing (42) and O-ring seal.
2. 1st speed gear (41).
3. 1st speed gear caged needle bearing (40).
4. Snap ring (39).
5. 1st speed gear blocker ring assembly.
A. Thrust Washer (38).
B. Inner Cone (37).
C. Friction Cone (36).
D. Blocker Ring (35).
6. 2nd speed gear (25) using J 36513 and hydraulic press.
- 1st/2nd synchronizer assembly (30), 2nd speed gear blocker ring (29), friction cone (28), 2nd speed gear inner cone (27), and thrust washer (26), will press off with 2nd speed gear (25).
7. 2nd speed gear caged needle bearing (24).
8. 3rd/4th synchronizer snap ring (13).
9. 3rd speed gear (20) using J 39473, V-blocks and hydraulic press.
- 3rd/4th synchronizer assembly (14) and 3rd speed gear blocker ring (19) will press off with 3rd speed gear (20).
10. Spacer (179).
11. 3rd speed gear caged needle bearing (21).

Important
- Do not replace tapered bearing (22) unless inspection shows bearing damage.

12. Mainshaft small tapered bearing (22) using J 39442, J 39443 and hydraulic press.
- Discard small tapered bearing (22).

Clean
- Mainshaft components with solvent and dry with compressed air.

Inspect
- Mainshaft components.
- Shaft (23) and spline for excessive wear or cracks. Replace if these conditions exist.
- Gear teeth (20, 25 and 41) for excessive wear, pitting, scoring, spelling, or fractures.
- Bearings (22 and 42) for roughness of rotation, burred or pitted conditions. Replace if these conditions exist.
- Synchronizers (14 and 30). Refer to "Synchronizers" in this section.

NOTICE: When replacing bearings (22 or 42) also replace bearing races (11 or 43).

NOTICE: If scuffed, nicked, burred or scoring conditions cannot be reconditioned by hand with a soft stone or crocus cloth, replace the component.

ASSEMBLE
1. New mainshaft small tapered bearing (22) using J 39473, V-blocks and hydraulic press.
2. 3rd speed gear caged needle bearing (21).
3. Spacer (179).
4. 3rd speed gear (20).
5. 3rd speed gear blocker ring (19).

Important
- When pressing the 3rd/4th synchronizer assembly (14):

A. Start press operation. "STOP" before keys engage blocker ring slots.
B. Lift and rotate 3rd speed gear (20) to engage keys with blocker ring.
C. Continue to press until seated.
6. 3rd/4th synchronizer assembly (14) using J 36183, J 36184 and hydraulic press.
- Install 3rd/4th synchronizer so ID groove on sleeve faces 3rd gear.
7. 3rd/4th synchronizer snap ring (13).
8. 2nd speed gear caged needle bearing (24).
9. 2nd speed gear (25).
10. Thrust washer (26).
11. 2nd speed gear inner cone (27).
12. Friction cone (28).
13. 2nd speed gear blocker ring (29).

Important
- When pressing the 1st/2nd synchronizer assembly (30):

A. Start press operation. "STOP" before keys engage blocker ring slots.
B. Lift and rotate 2nd speed gear (25) to engage keys with blocker ring.
C. Continue to press until seated.

14. 1st/2nd synchronizer assembly (30) using J 39371 and hydraulic press.
- Install 1st/2nd synchronizer so ID groove on sleeve faces 1st gear.
15. 1st speed gear blocker ring assembly.
A. Blocker ring (35).
B. Friction cone (36).
C. Inner cone (37).
D. Thrust Washer (38).
16. Snap ring (39).
17. 1st speed gear caged needle bearing (40).
18. 1st speed gear (41).
19. Mainshaft large tapered bearing (42) and O-ring seal.