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1044131-06
6-8
25B Air Valve and Air Motor Repair
Piston Repair
Piston Disassembly
CAUTION: Do not score the spool rod (5) or connecting rod (22). Any burrs will damage
the seals and cause them to leak.
1. Put the piston assembly, connecting rod (22) up, in a vise with the upper jam nut (15)
between the vise jaws. Turn the lower jam nut (19) counterclockwise (threads are
right-handed) to the end of the connecting rod threads.
2. Turn the connecting rod counter-clockwise to unscrew it from the upper jam nut.
Remove the piston (18).
3. Remove the remaining assembly from the vise. The upper jam nut will slide down the
telescoping screw (17). To replace the O-ring (4), spool rod (5), upper jam nut (15),
special nut (14), or telescoping screw:
a.
telescoping screw, away from the spool rod.
b. Unscrew the telescoping screw from the spool rod. Remove the O-ring, special nut,
and upper jam nut.
4. Remove the O-ring (23) from the connecting rod.
Figure 6-6 Piston Assembly Repair
4. O-ring 18. Piston
5. Spool rod 19. Lower jam nut
14. Special nut 22. Connecting rod
15. Upper jam nut 23. O-ring
17. Telescoping screw
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