Disassembly

1. Check clutch piston stroke as outlined in following steps.





2. Position overdrive support on wood blocks and mount forward clutch drum on support.
3. Remove bearing and race from forward clutch drum.





4. Mount dial indicator on clutch drum. Position dial indicator plunger against clutch piston.
5. Apply compressed air through right side feed hole in support and note piston stroke length on dial indicator.
6. Stroke length should be 3.55 - 3.73 mm (0.1348 - 0.1469 inch).
7. Replace clutch discs if stroke length is incorrect.





8. Remove clutch pack snap ring and remove retainer and clutch pack.





9. Remove clutch pack cushion plate.
10. Compress clutch springs with Tool 7538, or equivalent and remove piston snap ring.
11. Remove spring compressor tool and piston return springs.





12. Remount forward clutch drum on overdrive support.
13. Apply compressed air through feed hole in support to remove piston. Use only enough air pressure to ease piston out of drum.





14. Remove and discard clutch piston O-rings.
15. Remove clutch drum O-ring from rear hub of drum.





16. Remove three seal rings from clutch drum shaft.





17. Remove thrust bearing and race assembly from clutch drum.





18. Measure clutch disc thickness. Minimum allowable thickness is 1.51 mm (0.0595 inch). Replace clutch pack if any disc falls below specified minimum thickness.





19. Measure free length of piston return springs with springs mounted in retainer. Length should be 19.47 mm (0.767 inch). Replace springs and retainer if length is incorrect.





20. Inspect clutch piston check ball. Ball should move freely within piston. Check ball seating by applying low pressure compressed air to ball feed hole. Ball should seat firmly and not leak air.
21. Measure inside diameter of bushing in clutch drum hub. Maximum allowable diameter is 24.08 mm (0.9480 inch). Replace clutch drum if bushing inside diameter is greater than specified.