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Repair
34 3A0420H
Remove Air Motor
1. Cycle the yoke and pump rods near the bottom of
their stroke. Follow Shutdown, page 28.
2. Disconnect the air line from the air motor (103).
3. Remove the air motor rod cover (121) and pump
guards (122).
4. Use a wrench to hold the tie rod (102) flats to keep
the rods from turning. Unscrew the nuts (108) and
washers (107) from the tie rods.
5. Place a wrench on adapter rod (104). Use tool (70)
to loosen the serrated yoke nut (109) that holds the
air motor (103) above the yoke (111).
6. Face the front of the machine and slide the air motor
(103) to the opening in the yoke (111).
7. Use a hoist to remove the air motor by the lift ring.
8. Refer to the air motor manual to service or repair the
air motor.
9. Follow the steps in reverse order to reinstall the air
motor.
NOTE: Position air motor for correct mix ratio. See
Air Motor Position on page 18 for instructions.
Torque nuts (108) to 50-60ft-lb (68-81 N•m).
Air Controls
See FIG. 8 on page 35.
Replace Air Control Assembly
1. Close the main air shutoff valve on the air supply
line and on the system. Depressurize the air line.
2. Disconnect the air motor air lines and system air
line.
3. Remove the nut (8) and washer (5). Remove the
bottom air control manifold assembly from the cart.
4. Loosen the upper air control assembly from the air
motor.
5. Follow the steps in reverse order to reinstall the new
air control assembly.
Replace Air Filter Element
1. Close the main air shutoff valve on the air supply
line and on the system. Depressurize the air line.
2. Unscrew the serrated ring on filter bowl (210).
3. Remove and replace the filter element (210a). See
Air Controls, 258983, page 46.
Replace System Air Regulator
1. Close the main air shutoff valve on the air supply
line and on the system.
2. Disconnect air motor air lines and system air line.
3. Remove the regulator assembly (201) and replace
with new regulator. See Air Controls, 258983, page
46.
4. Follow the steps in reverse order to reassemble.
103
121
122
r_258914_3a0420a_7a
lift ring
102
108
107
109
111
r_258914_3a0420a_8a
104