Graco Inc 313797C, 290 Relieve pressure, page 15. Then repair Prime Valve

Basic Troubleshooting / 基本故障排除 / 기본적인 문제 해결

Problem		What To Check	What To Do
		(If check is OK, go to next check)	(When check is not OK, refer to this column)
Low Fluid Output	1.	Worn or clogged spray tip.	Relieve pressure, page 15. Replace or clean tip.
			Refer to gun instruction manual, 313347.
	2.	Verify pump does not continue	Service Pump, page 58.
		to stroke when gun trigger
		is released.
	3.	Prime valve leaking.	Relieve pressure, page 15. Then repair Prime Valve,
			page 60.
	4.	Suction hose connections.	Tighten any loose connections. Check o-rings
			on suction hose tube.

5.Electric supply with volt meter. Reset building circuit breaker; replace building fuse.

Meter must read 105-130 Vac for		Repair electrical outlet or try another outlet.
110-120	Vac models and 210-255
for 240	Vac models. Low voltages
reduce sprayer performance.

6.Extension cord size and length. Replace with a correct, grounded extension cord,

page 12.

7.	Leads from motor to circuit	Be sure male terminal pins are centered and firmly
	board for damaged or loose	connected to female terminals. Replace any loose
	wire connectors. Inspect wiring	terminals or damaged wiring. Securely reconnect
	insulation and terminals for	terminals.
	signs of overheating.
8.	Worn motor brushes which must	Replace Motor, page 33.
	be 1/4 in. (6 mm) minimum.
9.	Motor brushes binding in brush	Clean brush holders. Remove carbon dust by using
	holders.	compressed air to blow out brush dust.
10.	Low stall pressure. Turn pressure	Replace Pressure Control Assembly, page 60.
	control knob fully clockwise.
11.	Motor armature for shorts	Replace Motor, page 33.
	by using an armature tester
	(growler) or perform spin test,
	page 54.
12.	Pump is primed.	Prime pump, page 19.
13.	Inlet and outlet balls are not	Inlet: Remove suction tube and place pencil into inlet
	stuck.	housing to dislodge ball and allow proper priming.
		Outlet: Insert screwdriver in slot and remove
		Easy-Access door, page 11. Unscrew outlet valve
		with a 3/4 in. socket. Remove and clean assembly.

313797C 37