Troubleshooting - Graco NXT 25A641 Instructions/Parts And Repair

Troubleshooting

Relieve the pressure before checking or servicing
the equipment.
Problem
Air motor will not run.
Air continuously exhausting around air
motor piston rod.
Air continuously exhausting from muf-
fler.
Air motor "bounces" at top of stroke.
Air motor "bounces" at bottom of
stroke.
Icing inside motor.
3A3442B
NOTE: Check all possible problems and causes before
disassembling the air motor.
Cause
Damaged air valve (214).
Damaged pilot valve (213).
Damaged u-cups (207).
Damaged air valve plate (305) or cup
(312).
Damaged bottom pilot valve (213).
Damaged top pilot valve (213).
Air motor operating at high pressure or
high cycle rate.
Troubleshooting
Solution
Replace or service the air valve (214).
See page 5.
Replace the pilot valves (213). See page
7.
Replace the piston rod u-cups (207).
See page 9.
Replace or service the air valve (214).
See page 5.
Replace the bottom pilot valve (213).
See page 7.
Replace the top pilot valve (213). See
page 7.
Reduce the pressure, cycle rate, or duty
cycle of motor.
Reduce the dew point of compressed air
in the moisture coalescing filter.
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