Air Motor Repair
3A9121A
29
Replace Pilot Valve
1. Stop the pump at the middle of its stroke. Relieve
2. Disconnect the air line to the motor.
3. Use a 1/2 in. or 13 mm socket wrench to remove
the old pilot valves (62).
4. Lubricate and install the new pilot valves (66).
Torque to 95-105 in-lb (11-12 N•m).
5. Reconnect air line to the motor.
Disassemble the Air Motor
1. Follow steps in
2. Disconnect pilot valve air lines (37, 38) from the air
valve (30).
3. Remove six screws (27) and remove the manifold
and valve (30) and two gaskets (24). Inspect foam
for damage.
4. Use a 3/4 in. or 19 mm socket wrench to remove
the bolts (31).
5. Remove the top cover (22). Remove the o-ring (6).
6. Remove the muffler (17) from around the cylinder.
Remove the cylinder (14).
7. Slide the piston assembly (10) straight up off the
bottom cover (1).