Graco Inc 313313A, 500G, 256790 important safety instructions Troubleshooting

		Troubleshooting
Problem	Cause	Solution
Pump output is low	Strainer is clogged	Clean strainer.
	Piston ball is not seating	Service piston ball. Manual 310643.
	Piston packings are worn or damaged	Replace packings. Manual 310643.
	O-ring in pump is worn or damaged	Replace o-ring. Manual 310643.
	Intake valve ball is not seating properly	Clean intake valve. Manual 310643.
	Intake valve ball is packed with material	Clean intake valve. Manual 310643.
	Engine speed is too low	Increase throttle setting.
	Clutch is worn or damaged	Adjust or replace clutch. Page 37.
	Pressure setting is too low	Increase pressure.
	Fluid filter, tip filter or tip is clogged or	Clean filter. Manual 311254.
	dirty
	Large pressure drop in hose with heavy	Use larger diameter hose and/or reduce overall
	materials	length of hose. Use of more than 100 ft of 1/4
		in. hose significantly reduces performance of
		sprayer. Use 3/8 in. hose for optimum
		performance (50 ft minimum).
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. Manual 310643.
	Displacement rod is worn or damaged	Replace rod. Manual 310643.
Fluid is spitting from gun	Air in pump or hose	Check and tighten all fluid connections.
		Reprime pump.
	Tip is partially clogged	Clear tip. Manual 309640.
	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.
		Reassemble valve.
	Pump packings are worn	Replace pump packings. Manual 310643.
	Paint is too thick	Thin the paint according to the supplier's
		recommendations
	Engine speed is too high	Decrease throttle setting before priming pump.
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

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