Pull spool straight out.
Remove and replace eight o-rings (7) on spool exterior.
Insert special tool P/N 28584 (item 4, Section III, Appendix B) in second row of holes in sleeve (8).
Pull sleeve straight out. (Use screwdriver to pry if necessary).
Insert special tool P/N 28584 (item 4, Section III, Appendix B) bumper hook through bumper (9) and pulls straight
Remove and replace four o-rings (10) on sleeve (8) exterior and one o-ring (10) on retainer nut and elbow
assembly (4) exterior. Retainer nut o-ring same as sleeve o-rings.
Replace bumper (9).
Lubricate o-rings lightly with Haskel silicon lubricant (part of seals kit).
Apply liberal coating of lubricant to rubber side of bumper (9) and stick to end of sleeve (8).
Push bumper-sleeve unit all the way into bore in one smooth quick movement.
Install spool (6)
Install retainer and elbow assembly (4).
Install muffler and pipe assembly (3).
5-9.3. Pilot System Repair.
The following steps check the pilot system portion of the air drive.
Remove hexagonal o-ring sealed plug (11).
Remove spring (12) and using special tool, P/N 28584 (item 4, Section III, Appendix B) remove pilot stem (13).
Slant tool into hole after spring removed and pull up.
Inspect pilot stem and seat for foreign material. Replace stem if bent or scratched or molded seat is damaged.