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308485
Air Motor and Throat Service
10. Pull the piston assembly from the air motor base
(28), and set it aside.
11. Remove the vee block seal (10
{) with a pick, and
clean the groove in the air motor base (28).
Remove any dirt in the groove, and wipe the
groove clean with a cloth.
12. Inspect the air motor for damaged or worn inlet
valve grommets (17*), o-ring packings (19*, 20*),
valve nuts (21*), lock wires (22*), exhaust valve
poppets (26*), or inlet valve poppets (32*). If any
of these parts need to be replaced, continue with
steps 13 to 19. Otherwise, see Reassembly on
page 12.
13. Use a screwdriver to push down on the trip rod
yoke (13), and snap the toggles down. See Fig. 4.
MOVING PARTS HAZARD
To reduce the risk of pinching or
amputating your fingers, keep your
fingers clear of the toggle assemblies
when you are snapping the toggles (M in
Fig. 4 ) up or down.
WARNING
14. In this step, while you are prying with the screw-
driver with one hand, cover the toggle assemblies
with your other hand so as to catch the spring-
loaded toggle assemblies when they snap out of
the lugs. Place the tip of a screwdriver into the
piston between the piston lugs (L) below the pivot
pins (16) on the toggles, pry up with the screw-
driver handle to compress the springs on the
toggle assembly (M) up and away from the piston
lugs, and remove the parts. See Fig. 4.
15. Straighten the lockwires (22*) and remove them
from the valve nuts (21*). Screw the top nuts off.
Remove the trip rod yoke (13), actuator (12), and
trip rod (31). Unscrew the bottom nuts (21*), and
remove the poppets. Make sure the valve bar
spring clips (14) are not worn or damaged and that
they properly guide the actuator (12).
16. Remove the exhaust valve poppets (26) by cutting
them with a side cutter, then pull them out of the
actuator (12).
17. Clean all the parts carefully in a compatible solvent
and inspect them for wear or damage. Use all the
repair kit parts during reassembly, and replace
other parts as necessary.
18. Check the surfaces of the piston, piston rod, and
cylinder wall for scratches or wear. A scored rod
will cause premature packing wear and leaking.
19. Lubricate all parts with a light, waterproof grease.