- Inspect the input housing and shaft assembly for the following conditions:
| • | Spline wear - internal and external |
| • | Input speed sensor models, rotor teeth for cracks or damage |
| • | Three turbine shaft ball check valves are present and move freely |
| • | Retainer and ball check valve assembly (620) |
| • | Orificed cup plug (698) |
- Test the input housing for cracks by tapping housing with wooden handle. Housing should produce a sharp ring.
- Inspect the turbine shaft oil seal ring (619) 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.
