Graco Inc 300E What To Check, What To Do, Type Of Problem, If check is OK, go to next check

				Repair / Réparation / Reparación
		WHAT TO CHECK		WHAT TO DO
TYPE OF PROBLEM	If check is OK, go to next check		When check is not OK, refer to this column
Pump output is low	14.	O-ring in pump is worn or damaged	14. Replace o-ring; see pump manual 310643.
	15.	Intake valve ball is packed	15.	Clean intake valve; see pump manual 310643.
		with material
	16.	Pressure setting is too low	16.	Increase pressure.
	17.	Large pressure drop in hose	17.	Use larger diameter hose and/or reduce overall
		with heavy 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).
Motor runs but pump does not	1.	Displacement pump pin (32)	1.	Replace pump pin if missing. Be sure retainer
stroke		damaged or missing; see pump		spring (31) is fully in groove all around
		manual 310643.		connecting rod; see pump manual 310643.
	2.	Connecting rod assembly (43)	2.	Replace connecting rod assembly; see pump
		damaged; see pump manual		manual 310643.
		310643.
	3.	Gears or drive housing damaged,	3.	Inspect drive housing assembly and gears for
		page 71.		damage and replace if necessary; see pump
				manual 310643.
Excessive paint leakage into	1.	Throat packing nut is loose	1.	Remove throat packing nut spacer. Tighten
throat packing nut				throat packing nut just enough to stop leakage.
	2.	Throat packings are worn	2.	Replace packings; see pump manual 310643.
		or damaged
	3.	Displacement rod is worn	3.	Replace rod; see pump manual 310643.
		or damaged
Fluid is spitting from gun	1.	Air in pump or hose	1.	Check and tighten all fluid connections.
				Reduce engine speed and cycle pump
				as slowly as possible during priming.
	2.	Tip is partially clogged	2.	Clear tip; see tip guard manual 309640.
	3.	Fluid supply is low or empty	3.	Refill fluid supply. Prime pump; see pump
				manual 310643. Check fluid supply often
				to prevent running pump dry.
Pump is difficult to prime	1.	Air in pump or hose	1.	Check and tighten all fluid connections.
				Reduce engine speed and cycle pump
				as slowly as possible during priming.
	2.	Intake valve is leaking	2.	Clean intake valve. Be sure ball seat is not
				nicked or worn and that ball seats well.
				Reassemble valve.
	3.	Pump packings are worn	3.	Replace pump packings; see pump manual
				310643.
	4.	Paint is too thick	4.	Thin the paint according to the supplier’s
				recommendations.

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