Main Shaft Assembly for Single-Range: Inspection

Disassembled parts should be washed with unleaded gasoline first and then inspected carefully.

1. Bearings

   Replace the bearing in following cases:

   1. When the bearing balls, outer races and inner races are broken or rusty.
   2. When the bearing is worn.
   3. When the bearings fail to turn smoothly or emit noise in rotation after gear oil lubrication.
   4. When bearings have other defects.
2. Bushing (each gear)

   Replace the bushings in 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 following cases:

   • When the inner surface and end face is damaged.
   • When the ring inner surface is abnormally or partially worn.
   • When contact surfaces of the synchronizer ring insert have cracks or abnormally worn.
5. Shifting insert key

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

   Fig 1: Identifying Insert Key

   Courtesy of SUBARU OF AMERICA, INC.
6. Oil seal

   Replace the oil seal if the lip is deformed, hardened, 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.