Graco 239140, 223596 important safety instructions Troubleshooting, Problem Cause Solution

Troubleshooting

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8.

1.Relieve the pressure.

2.Check all possible problems and solutions before disassembling pump.

Problem	Cause	Solution
Pump fails to operate.	Restricted line or inadequate air	Clear; increase air supply.
	supply.
	Insufficient air pressure; closed or	Open; clean (be sure to use air
	clogged air valves, etc.	filter).
	Exhausted fluid supply.	Refill; purge all air from pump and
		fluid lines.
	Damaged air valve; stalling.	Service air motor (see air motor
		manual, supplied).
	Dried fluid seizure of displacement	Clean, check or replace throat pack-
	rod (103).	ings (114, 123); always stop pump at
		bottom of stroke and keep wet-cup
		filled with compatible solvent.
Pump operates but output is low on	Restricted line or inadequate air	Clear; increase air supply.
both strokes.	supply.
	Insufficient air pressure; closed or	Open; clean (be sure to use air
	clogged air valves, etc.	filter).
	Exhausted fluid supply.	Refill; purge all air from pump and
		fluid lines.
	Clogged fluid line, valves, etc.	Clear* (be sure to use fluid filter).
	Packing nut (104) is too tight.	Loosen (see page 8).
	Loose packing nut (104) or worn	Tighten packing nut (see page 8);
	throat packings (114, 123).	replace throat packings.
Pump operates but output is low on	Held open or worn intake valve.	Clear; service. See page 12.
downstroke.
Pump operates but output is low on	Held open or worn fluid piston valve	Clear; service. See page 12.
upstroke.	or packings (115, 124).
Erratic or accelerated operation.	Exhausted fluid supply.	Refill; purge all air from pump and
		fluid lines.
	Held open or worn intake valve.	Clear; service. See page 12.
	Held open or worn fluid piston valve	Clear; service. See page 12.
	or packings (115, 124).

*To determine if the fluid hose or gun is obstructed, relieve the pressure and 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 (about 20 to 40 psi [0.14 to 0.28 MPa, 1.4 to 2.8 bar]). If the pump starts when the air is turned on, the obstruction is in the fluid hose or gun.

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