Graco LD Series, Instructions Manual

Page: 24 / 32

Troubleshooting
24 3A1334P
Intermittent air leakage coming from
behind the air manifold. Pump con-
tinues to function normally.
Gasket is leaking
Replace gasket.
Lower air pressure to prevent reoc-
currence.
Thermal relief inlet check relief pas-
sage in inlet housing is plugged
Clear obstruction.
Replace inlet filter.
Continuous air exhaust through muf-
fler
Worn or damaged piston o-ring or
valve cup.
Service air motor / valve
Damaged valve gasket
Replace valve gasket.
Lower air pressure to prevent reoc-
currence.
Ice build-up on the valve plate allows
air leakage past valve u-cup sealing
surface
Lower compressed air dewpoint.
Increase compressed air tempera-
ture.
Decrease air pressure.
Increase ambient room temperature.
Pump operates but output is low
Held open or worn intake valve Clear; service.
Held open or worn pump piston
packings
Clear; service.
The muffler is partially blocked Clear muffler.
The inlet filter is partially blocked Clear the filter.
Inadequate air supply pressure or
restricted air lines Increase air supply; clear restric-
tions.
Partially closed or clogged pilot
valves Open valves. Clear clog as neces-
sary.
Partially clogged fluid line, hose,
valves, etc.
Clear clog as necessary.
Oil leakage through air exhausts Throat seal is damaged Replace throat seal (u-cup).
Problem Cause Solution