Air Motor Troubleshooting - Graco UniDrum C59784 Instructions And Parts List

Air Motor Troubleshooting

For additional information about the air motor, refer to Related Manuals on page 3 to find the applicable instruction
manual.
Problem
Air motor will not shift directions,
stalled in DOWN position
Air motor will not shift directions,
stalled in UP position
Air motor stalled halfway between
the top and bottom
Air continually exhausting around air
motor shaft.
Air continually exhausting around
the air valve/slide valve
Air continually exhausting from
muffler while the motor is idle
Oil leaking from exhaust port
Frost build-up on muffler
309169ZAF
Cause
Main air valve spool is dirty or
damaged
Air motor shaft seal is damaged
Air valve/slide valve gasket is
damaged
Internal seal damage
Too much lubricant mixed in with
the air supply
Air motor operating at high
pressure, or high cycle rate
Troubleshooting
Solution
Clean/rebuild main air valve.
Replace air motor shaft seal.
Replace the valve gasket.
Rebuild air motor.
Reduce lubricant supply.
Reduce pressure, cycle rate, or duty
cycle of the air motor.
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