Graco 256714, 256713, 223540, 224348 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 9.

Before servicing this equipment always make sure to relieve the pressure.

Check all possible problems and solutions before disassembling the pump.

Problem	Cause	Solution
Pump fails to operate	Restricted line or inadequate air sup-	Clear; Increase air supply.
	ply
	Insufficient air pressure; closed or	Open, clean.
	clogged air valves, etc.
	Exhausted fluid supply	Refill; purge all air from pump and
		fluid lines.
	Damaged air valving mechanism;	Service air motor (see manual
	stalling	306982 or 307043).
	Dried fluid seizure of displacement	Clean, check or replace throat pack-
	rod (1)	ings (3, 25); always stop the pump at
		the bottom of its stroke and keep the
		wet-cup filled with compatible solvent.
Pump operates, but output low on	Restricted line or inadequate air sup-	Clear; increase air supply.
both strokes	ply
	Insufficient air pressure; closed or	Open, clean.
	clogged air valves, etc.
	Exhausted fluid supply	Refill; purge all air from pump and
		fluid lines.
	Clogged fluid line, valves, etc.	Clear*.
	Packing nut (14) too tight	Loosen (see page 10).
	Loose packing nut (14) or worn throat	Tighten packing nut (see page 10);
	packings (3, 25)	replace throat packings.
Pump operates, but output low on	Held open or worn intake valve.	Clear; service.
down stroke
Pump operates, but output low on	Held open or worn fluid piston valve	Clear; service.
up stroke	or packings (29, 30)
Erratic or accelerated operation	Exhausted fluid supply	Refill; purge all air from the pump and
		fluid lines.
	Help open or worn intake valve.	Clear; service.
	Help open or worn fluid piston valve	Clear; service.
	or packings (29, 30)

*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 just enough to start the pump (about 20–40 psi [140–280 kPa, 1.4–2.8 bar]). If the pump starts when the air is turned on, the obstruction is in the fluid hose or gun.

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