Service
306518ZAC 9
6. Using wrenches on the flats of the displacement rod
(8) and on the flats of the fluid piston (110), unscrew
the fluid piston from the displacement rod. Remove
the ball (111) from the end of the displacement rod,
and remove the packing o-ring (104) from the fluid
piston.
7. Clamp the air motor upright in the vise by closing
the vise jaws below the flange.
8. Unscrew the cylinder cap nut (29) from the top of
the air motor cylinder (17).
9. Pull up on the cylinder cap nut (29) to expose the
trip rod, grasp the trip rod with padded pliers, and
unscrew the cylinder cap nut from the trip rod.
10. Remove the six screws (21) holding the air motor
cylinder (17) to the air motor base (5), and carefully
pull the cylinder straight up off the piston (2).
11. Pull the air motor piston/displacement rod assembly
(2, 8) clear of the air motor base (5) by pulling up on
the air motor piston.
12. Remove the o-rings (9, 112) and u-cup packing (6)
from the air motor base (5). Use needle-nose pliers
to remove the u-cup packing from the bottom of the
air motor base.
13. Remove the o-ring (24) from the air motor piston (2).
14. Clamp the displacement rod upright in the vise by
closing the vise jaws on the flats of the displace-
ment rod.
15. Use a screw driver to push down on the trip rod
yoke (22) to snap the toggles (M) down. (F
IG. 4)
16. Remove the lockwires (31) from the adjusting nuts
(30) of the transfer valves. Screw the top nuts off.
Screw the valve poppet (1) stems out of the grom-
mets (12) and bottom nuts (30). Take the valve pop-
pets off the stems and squeeze them firmly to check
for cracks.
17. Grip the toggle rockers (26) with pliers. Compress
the springs (27) and swing the toggle assembly (M)
up and away from the piston lugs (L), and remove
the assembly. Check that the valve, actuator (13) is
support by the spring clips (14), but slides easily into
them. (F
IG. 4)
18. Remove the trip rod yoke (22), actuator (13), and
trip rod (11). Check the exhaust valve poppets (16)
for cracks.
19. To remove the exhaust valve poppets (16), stretch
them out and cut them with a sharp knife.
NOTICE
Do not damage the plated surface of the trip rod (11).
Damaging the surface of the trip rod can result in
erratic air motor operation. Use the special padded
pliers to grasp the rod.
NOTICE
To avoid damaging the cylinder wall, lift the cylinder
straight up off the piston. Never tilt the cylinder while
you are removing it.
FIG. 3
