10
308352
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page
7.
1.
Relieve the pressure.
2.
Check all possible problems and causes before
disassembling the pump.
PROBLEM
CAUSE
SOLUTION
Pump fails to operate.
Restricted line or inadequate air supply;
closed or clogged valves.
Clear; increase the air supply.
Check that all valves are open.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small.
Open, clear*; use a hose with a larger ID.
Fluid dried on the displacement rod.
Clean; always stop the pump at the bottom of its
stroke; keep the wet-cup 1/3 filled with a compat-
ible solvent.
Dirty, worn, or damaged motor parts.
Clean or repair; see the separate motor manual.
Pump operates, but
output low on both
strokes.
Restricted line or inadequate air supply;
closed or clogged valves.
Clear; increase the air supply.
Check that all valves are open.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small.
Open, clear*; use a hose with a larger ID.
Bleeder valve is open.
Close the valve.
Air leaking into the supply container.
Check the ram plate seal.
Fluid is too heavy for pump priming.
Use the bleeder valve (see page 8); use a ram.
Held open or worn intake valve or seals. Clear the valve; replace the seals.
Worn packings in the displacement
pump.
Replace the packings.
Pump operates, but
output low on down-
stroke.
Fluid is too heavy for pump priming.
Use the bleeder valve (see page 8); use a ram.
Held open or worn intake valve or seals. Clear the valve; replace the seals.
Pump operates, but
output low on upstroke.
Held open or worn piston valve or seals. Clear the valve; replace the seals.
THE TROUBLESHOOTING CHART IS CONTINUED ON PAGE 11.
* To determine if the fluid hose or gun is obstructed, follow the
Pressure Relief Procedure
on page 7. Disconnect
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.
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