Graco 222837, Instructions-Parts List Manual

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Troubleshooting Chart
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 12.
1. Relieve the pressure.
2. Check all possible causes and problems before
disassembling the pump.
PROBLEM CAUSE SOLUTION
Pump fails to operate
Restricted line or inadequate air/hydraulic
supply; closed or clogged valves Clear; increase air/hydraulic supply.
Check that valves are open.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small Open, clear*; use hose with larger ID.
Fluid dried on the displacement rod Clean; always stop pump at bottom of stroke;
keep wet-cup 1/3 filled with compatible solvent.
Dirty, worn, or damaged motor parts Clean or repair; see separate motor manual.
Pump operates, but out-
put low on both strokes Restricted line or inadequate air/hydraulic
supply; closed or clogged valves Clear; increase air/hydraulic supply.
Check that valves are open.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small Open, clear*; use hose with larger ID.
Bleeder valve open Close.
Fluid too heavy for pump priming Use bleeder valve (see pages 13 and 14); use ram.
Worn packings in displacement pump Replace packings.
Pump operates, but out-
put low on downstroke Held open or worn intake valve Clear valve; service.
Fluid too heavy for pump priming Use bleeder valve (see pages 13 and 14); use ram.
Pump operates, but out-
put low on upstroke Held open or worn piston valve or packings. Clear valve; replace packings.
Erratic or accelerated
pump speed Exhausted fluid supply Refill and prime.
Fluid too heavy for pump priming Use bleeder valve (see pages 13 and 14); use ram.
Held open or worn piston valve or packings. Clear valve; replace packings.
Held open or worn intake valve Clear valve; service.
* To determine if the fluid hose or gun is obstructed, relieve the pressure. Disconnect the fluid hose and place a
container at the pump fluid outlet to catch any fluid. Turn on the air/hydraulic power just enough to start the pump. If
the pump starts when the air/hydraulic power is turned on, the obstruction is in the fluid hose or gun.