Caution: Do not allow the bearings to spin. Turn them slowly by hand. Spinning the bearings may damage the race and the rollers.
- Clean all bearing components in a suitable solvent and air dry.
 
- Inspect the bearings and journals for roughness and unusual wear or damage.
 
- Inspect the main shaft bearing journals for wear.
 
- Inspect the main shaft speed gear bearings for wear.
 
- Inspect the main drive gear pilot bearing rollers for wear.
 
- Replace components which show signs of excessive wear.
 
- Do not file surfaces which have been hardened and precision ground.
 
- Replace worn or damaged bearings.
 
- Replace mated bearing components when only one part is damaged.