Troubleshooting

Problem

Cause

Solution

 

 

 

 

 

Replace gasket.

 

Gasket is leaking

 

Intermittent air leakage coming from

Lower air pressure to prevent reoc-

 

 

currence.

behind the air manifold. Pump con-

 

 

 

tinues to function normally.

 

Clear obstruction.

 

 

 

Thermal relief inlet check relief pas-

 

 

sage in inlet housing is plugged

 

 

 

Replace inlet filter.

 

 

 

 

Worn or damaged piston o-ring or

Service air motor / valve

 

valve cup.

 

 

 

 

 

Continuous air exhaust

 

Replace valve gasket.

 

Damaged valve gasket

 

 

Lower air pressure to prevent reoc-

 

 

 

 

currence.

 

 

 

 

Held open or worn intake valve

Clear; service.

 

 

 

 

Held open or worn pump piston

Clear; service.

 

packings

 

 

 

 

 

 

The muffler is partially blocked

Clear muffler.

 

 

 

 

The inlet filter is partially blocked

Clear the filter.

Pump operates but output is low

 

 

Inadequate air supply pressure or

Increase air supply; clear restric-

 

 

restricted air lines

tions.

 

 

 

 

Partially closed or clogged pilot

Open valves. Clear clog as neces-

 

valves

sary.

 

 

 

 

Partially clogged fluid line, hose,

Clear clog as necessary.

 

valves, etc.

 

 

 

 

 

Oil leakage through air exhausts

Throat seal is damaged

Replace throat seal (u-cup).

 

 

 

24

3A1334E

Page 24
Image 24
Graco 3A1334E important safety instructions Replace gasket