Graco Inc 313483A important safety instructions Prime/Drain valve is plugged

Troubleshooting

Problem	Cause	Solution
Pump output is low	Strainer (82) is clogged	Clean strainer.
(Base Coat Pump see pages 70.
	Piston ball is not seating	Service piston ball.
Top Coat Pump see manual 310894)
	Piston packings are worn or damaged	Replace packings.
	O-ring in pump is worn or damaged	Replace o-ring.
	Intake valve ball is not seating properly	Clean intake valve.
	Intake valve ball is packed with material	Clean intake valve.
	Engine speed is too low	Increase throttle setting.
	Clutch is worn or damaged	Adjust or replace clutch. Page 57.
	Pressure setting is too low	Increase pressure.
	Tip filter or tip is clogged or dirty	Clean filter.
	Large pressure drop in hose with heavy	Use larger diameter hose and/or reduce overall
	materials	length of hose.
Excessive paint leakage into throat	Throat packing nut is loose	Remove throat packing nut spacer. Tighten
packing nut		throat packing nut just enough to stop leakage.
	Throat packings are worn or damaged	Replace packings.
	Displacement rod is worn or damaged	Replace rod.
Fluid is spitting from gun	Air in pump or hose	Check and tighten all fluid connections. Rep-
		rime pump.
	Tip is partially clogged	Clear tip.
	Fluid supply is low or empty	Refill fluid supply. Prime pump. Check fluid
		supply often to prevent running pump dry.
Pump is difficult to prime	Air in pump or hose	Check and tighten all fluid connections.
		Reduce engine speed and cycle pump as
		slowly as possible during priming.
	Intake valve is leaking	Clean intake valve. Be sure ball seat is not
		nicked or worn and that ball seats well. Reas-
		semble valve.
	Pump packings are worn	Replace pump packings.
	Paint is too thick	Thin the paint according to the supplier's rec-
		ommendations
	Engine speed is too high	Decrease throttle setting before priming pump.
Prime/Drain valve is plugged	Material hardened in valve	Operate drain valve at least once per hour
		when spraying.
		Flush valve more thoroughly when cleaning
		sprayer.
	Aggregate packed up in valve	Valve is opened too slowly and/or aggregate is
		too large.
Clutch squeaks each time clutch	Clutch surfaces are not matched to	Clutch surfaces need to wear into each other.
engages	each other when new and may cause	Noise will dissipate after a day of run time.
	noise
High engine speed at no load	Misadjusted throttle setting	Reset throttle to 3300 engine rpm at no load.
	Worn engine governor	Replace or service engine governor
No display, sprayer operates	Display damaged or has bad connec-	Check connections. Replace display.
	tion

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