Graco 3A1339 Instructions Manual page 24

Troubleshooting
Problem
Intermittent air leakage coming from
behind the air manifold. Pump con-
tinues to function normally.
Continuous air exhaust
Pump operates but output is low
Oil leakage through air exhausts
24
Cause
Gasket is leaking
Thermal relief inlet check relief pas-
sage in inlet housing is plugged
Worn or damaged piston o-ring or
valve cup.
Damaged valve gasket
Held open or worn intake valve
Held open or worn pump piston
packings
The muffler is partially blocked
The inlet filter is partially blocked
Inadequate air supply pressure or
restricted air lines
Partially closed or clogged pilot
valves
Partially clogged fluid line, hose,
valves, etc.
Throat seal is damaged
Solution
Replace gasket.
Lower air pressure to prevent reoc-
currence.
Clear obstruction.
Replace inlet filter.
Service air motor / valve
Replace valve gasket.
Lower air pressure to prevent reoc-
currence.
Clear; service.
Clear; service.
Clear muffler.
Clear the filter.
Increase air supply; clear restric-
tions.
Open valves. Clear clog as neces-
sary.
Clear clog as necessary.
Replace throat seal (u-cup).
3A1334D