Air Motor Repair
3A9121A
27
Air Motor Repair
Ice in Air Motor
When compressed air is exhausted, the sudden drop in
pressure causes the air temperature to drop below the
freezing point. This causes any water liquid or vapor to
turn to ice.
Higher air pressures pack high amounts of air and
water vapor in each cycle and create more expansion
and ice. Higher cycle rates also build up the ice and
lower the motor temperature faster. It is important to
select the correct motor and pump size to run at a
lower pressure, and cycle slower.
Warm humid climates can produce high levels of icing
because of the higher humidity levels. Low ambient
temperatures near freezing make it easier for the motor
parts to drop below freezing.
To minimize ice build-up:
•
Lower the dew point of the compressed air.
Use a
refrigerated air dryer, coalescing filter, or desiccant
filter to lower the water vapor content of the air.
•
Raise the compressed air temperature.
Warmer
air going in helps the motor parts stay above
freezing. Compressed air, especially at these
volumes, is warm when compressed. Keep the air
warm or stay near the compressor to reduce icing.
• Use the bleed air to clear ice build up.
Repair Air Valve
Replace Complete Air Valve
1. Stop the pump at the middle of its stroke. Follow
the
2. Disconnect air line to the motor.
3. Disconnect the air line to the motor and the pilot
valve lines to the air valve (30).
4. If installed on air motor, remove reed switch kit and
solenoid from air valve (30).
5. Use a 6mm Allen wrench to remove screws (27).
Remove the air valve (30) and gasket (29).
6. To install a replacement air valve, continue with
step 7. To repair the air valve, go to
, page 28, step 1.
7. Align the new air valve gasket (29) on the manifold,
then attach the air valve (30). Torque (27) to 80 +/-
in-lb.
NOTE:
Use grease to hold the gasket (29) in place. Be
sure the bleed air hole in the gasket aligns with the
bleed port in the valve manifold.
