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24 3A1334F
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
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.
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