Main Shaft Assembly: Inspection

Disassembled parts should be washed clean first and then inspected carefully.

1. Bearings

   Replace bearings in the following cases:

   • Bearings whose balls, outer races and inner races are broken or rusty.
   • Worn bearings
   • Bearings that fail to turn smoothly or make abnormal noise when turned after gear oil lubrication.
   • Bearings having other defects
2. Bushing (each gear)

   Replace the bushing in the following cases:

   • When the sliding surface is damaged or abnormally worn.
   • When the inner wall is abnormally worn.
3. Gears
   • Replace gears with new ones if their tooth surfaces are broken, damaged, or excessively worn.
   • Correct or replace if the cone that contacts the baulk ring is rough or damaged.
   • Correct or replace if the inner surface or end face is damaged.
4. Baulk ring

   Replace the ring in the following cases:

   • When the inner surface and end face are damaged.
   • When the ring inner surface is abnormally or partially worn down.
   • When the contact surface of the synchronizer ring insert is scored or abnormally worn down.
5. Shifting insert key

   Replace the insert if deformed, excessively worn, or defective in any way.

   Fig 1: Identifying Shifting Key, Hub & Slider

   
6. Oil seal

   Replace the oil seal if the lip is deformed, hardened, damaged, worn, or defective in any way.

7. O-ring

   Replace the O-ring if the sealing face is deformed, hardened, damaged, worn, or defective in any way.

8. Gearshift mechanism

   Repair or replace the gearshift mechanism if excessively worn, bent, or defective in any way.