Graco 25P784, Instructions Manual

Page: 19 / 28

Troubleshooting
3A7519A 19
Troubleshooting
1. Follow Pressure Relief Procedure , page 8, before
checking or making repairs repairing to the pump.
2. Check all possible problems and causes before
disassembling the pump.
Problem Cause Solution
Pump fails to operate or there is no
fluid flow.
Inadequate air supply pressure Increase the air supply.
Restricted air line Clear the line.
Closed dispense valves Open the valve.
Clogged fluid lines, hoses, and/or
dispense valve
1. Disconnect the fluid line.
2. Turn the air on. If the pump
starts, the line, hose, and/or
valve is clogged. Clear the
obstruction.
Damaged air motor Service the air motor. See the
Dyna-Star Air Motor manual.
Exhausted fluid supply Refill the fluid supply and prime or
flush.
Continuous air exhaust. Worn or damaged air motor gasket,
packing, seal, etc. Service the air motor. See the
Dyna-Star Air Motor manual.
Erratic pump operation. Exhausted fluid supply Refill the fluid supply and prime or
flush.
Worn fluid seals Replace worn seals. See Parts ,
beginning on page 20.
Inadequate air supply pressure. Increase the air supply.
Pump operates but the output is low
on the down or up stroke. Worn fluid seals Replace worn seals. See Parts ,
beginning on page 20.
Fluid is coming out of the gap
between either the air motor and the
housing adapter or the housing
adapter and the outlet housing. Worn or damaged throat seal. Replace worn seals. See Parts ,
beginning on page 20.