Graco 3A1334E Manual De Usuario

NOTE: Check all other possible problems and solutions 
before disassembling the pump. Before you troubleshoot 
problems using the table below, relieve the pressure 
and disconnect the pump fluid line. If the pump starts 
when the air is turned on again, the fluid line, dispensing 
valve, etc. clogged.

Pump runs but no fluid output

Pump is not fully primed

Crack a fitting at the outlet of the 
pump to allow a slow leak to purge 
any air in the pump. Repeat start up 
procedure, page 11.

Oil leakage 

Check connection and tighten.

The piston valve is not seating prop-
erly or the piston o-ring is damaged

Check and replace parts as needed.

Exhausted fluid supply

Refill and reprime.

The pump inlet filter is blocked

Clear the filter

The suction tube (hose) has an air 
leak

Check the connection and tighten as 
needed.

Pump fails to operate or stops

Damaged pilot valve

Service pilot valve.

Lower air pressure to prevent reoc-
currence.

Damaged main air valve

Replace air valve.

Lower air pressure to prevent reoc-
cur an ce.

Inadequate air supply pressure or 
restricted air lines.

Increase air supply; clear.

Closed or clogged dispensing valve

Open valve if closed. Clear clog if 
necessary.

Clogged fluid lines, hose valves, etc.

Clear clogs.

Damaged air motor

Service air motor.

Erratic or accelerated operation

Exhausted fluid supply

Refill and reprime.

Damaged valve gasket

Replace valve gasket.

Lower air pressure to prevent reoc-
currence.