- Clean all the parts in a suitable solvent. Air dry all the parts.
 
- Inspect the gear tooth surfaces on all the gear sets for the following
conditions:
 
| •  | High spots (Small-shiny spots on the gear teeth mating surface)
that could cause gear noise | 
 
- Inspect for damaged splines on the input shaft, mainshaft, and
the countershaft extension.
 
- Remove nicks and burrs with a soft stone or a crocus cloth.
 
- Replace a burred or nicked part that cannot be reconditioned by
hand.
 
- Replace gears and gear assemblies that are worn or damaged.