- Inspect the input housing
 and shaft assembly for the following items:
 
| •  | Three turbine shaft checkballs | 
 
| •  | Retainer and checkball assembly (620) | 
 
| •  | Orificed cup plug (698) | 
 
- Inspect the turbine shaft oil seal ring grooves for damage or
 burrs. The oil seal rings (619) must fit loose into the ring grooves.
 
- Inspect the oil feed passages
 for obstructions.
 
- Apply compressed air into the passages indicated.