Graco 220667, 220666, 237012, 220663 Troubleshooting, Symptom Probable Cause Test Procedure Remedy

Troubleshooting

Relieve the pressure, and check all probable causes before disassembling the pump.

WARNING

PRESSURIZED EQUIPMENT HAZARD

To reduce the risk of a serious injury whenever you are instructed to relieve pressure, follow the Pres- sure Relief Procedure on page 10.

	SYMPTOM		PROBABLE CAUSE	TEST PROCEDURE		REMEDY
1.	Pump will not	Air is getting into the intake
	prime	housing:
		a. Defective o-ring (19) on in-			a.	Replace o-ring.
			take manifold or accumu-			See page 15.
			lator
		b.	Suction hose/tube	not	b.	Tighten, or add
			sealed			sealant to threads
2.	Pump will not	a.	Air supply turned off		a.	Turn air supply on
	run	b.	Fluid valve turned off		b.	Turn fluid supply
						valve on
		c.	Air pressure regulator	c. Minimum air pressure	c.	Increase air pressure
			set too low	on regulator 25 psi (175		regulator adjustment
				kPa, 1.95 bar), depend-
				ing on fluid being
				pumped
		d	Pilot valve assemblies	d. Remove tube ends from	d.	Repair or replace pilot
			worn	hose studs. With air		valve assembly. See
				supply on, alternately		page 22.
				plug tube ends. If pump
				runs, remove pilot
				valves, inspect
		e.	Air control valve	e. Check for air coming	e.	Repair or replace air
			defective	from exhaust when		control valve. See page
				pump is not running		20.
		f.	Air piston quad ring (28)		f.	Replace quad ring. See
			worn			page 18.

12 307843