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WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
PROBLEM
Pump fails to operate.
Pump operates, but
output low on both
strokes.
THE TROUBLESHOOTING CHART IS CONTINUED ON PAGE 13.
*
To determine if the fluid hose or gun is obstructed, follow the Pressure Relief Procedure on page 8. Dis-
connect the fluid hose and place a container at the pump fluid outlet to catch any fluid. Turn on the air just enough
to start the pump. If the pump starts when the air is turned on, the obstruction is in the fluid hose or gun.
NOTE: If you experience air motor icing, call your Graco distributor.
12
308355
Troubleshooting
CAUSE
Restricted line or inadequate air supply;
closed or clogged valves.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small.
Fluid dried on the displacement rod.
Dirty, worn, or damaged motor parts.
Restricted line or inadequate air supply;
closed or clogged valves.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small.
Bleeder valve is open.
Air is leaking into the supply container. Check the ram plate seal.
Fluid is too heavy for pump priming.
Held open or worn intake valve or seals. Clear the valve; replace the seals.
Worn packings in the displacement
pump.
1. Relieve the pressure.
2. Check all possible problems and causes before
disassembling the pump.
SOLUTION
Clear; increase the air supply.
Check that all valves are open.
Open, clear*; use a hose with a larger ID.
Clean; always stop the pump at the bottom of its
stroke; keep the wet-cup 1/3 filled with a compat-
ible solvent.
Clean or repair; see the separate motor manual.
Clear; increase the air supply.
Check that all valves are open.
Open, clear*; use a hose with a larger ID.
Close the valve.
Use the bleeder valve (see page 9); use a ram.
Replace the packings.
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