Graco 233712, 233710 Problem, Cause, Solution, Use larger diameter hose and/or reduce overall

PROBLEM	CAUSE	SOLUTION
Pump output low	Strainer (31) clogged	Clean.
	Piston ball (25) not seating	Service piston ball check. Manual 309277.
	Piston packings worn or damaged	Replace packings. Manual 309277.
	Displacement pump o-ring (227) is damaged	Replace o-ring. Manual 309277.
	Intake valve ball not seating properly	Clean and service. Manual 309277.
	Engine speed is too low	Increase throttle setting. See Manual 309410.
	V–belt slipping	Tighten V–belt with tension bar (101). Adjust
		bracket until it takes 15 lb of force to lock
		tension bar down.
	Clutch worn or damaged	Replace. See page 11.
	Pressure setting is too low	Increase pressure. Manual 309410.
	Fluid filter (318), tip filter or tip is clogged or	Clean filter. Manual 309410 or 309091.
	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 perfor-
		mance (50 ft minimum).
Excessive paint leakage into	Throat packing nut is loose	Remove throat packing nut spacer. Tighten
throat packing nut		throat packing nut just enough to stop leakage.
	Throat packings worn or damaged	Replace packings. Manual 309277.
	Displacement rod worn or damaged	Replace rod. Manual 309277.
Spitting from gun	Air in fluid pump or hose	Check and tighten all fluid connections.
		Reprime pump. Manual 309410.
	Tip partially clogged	Clear tip. Manual 309091.
	Fluid supply is low or empty	Refill and prime pump. See Startup, Manual
		309410. Check fluid supply often to prevent
		running pump dry.
Pump is difficult to prime	Air leak	Check and tighten all fluid connections.
		Reduce engine speed and cycle pump as
		slowly as possible during priming.
	Intake valve is leaking	Shut off pump and relieve pressure. Disas-
		semble and clean intake valve. Be sure ball
		seat is not nicked or worn and that ball seats
		well. Reassemble.
	Worn packings	Repack pump. Manual 309277.
	Fluid is too thick	Thin fluid according to supplier’s recommenda-
		tions.
	Engine speed is too high	Decrease throttle setting before priming pump.
		Manual 309410.
Clutch squeaks each time	Clutch surfaces are not matched to each other	Clutch surfaces need to wear into each other.
clutch engages	when new and may cause noise	Noise will dissipate after a day of run time
High engine speed at no	Misadjusted throttle setting	Reset throttle to 3700 engine rpm at no load
load
	Worn engine governor	Replace or service engine governor
Gallon counter not working	Bad sensor, broken or disconnected wire	Check connections. Replace sensor or wire.
No display, sprayer operates	Display damaged or has bad connection	Check connections. Replace display.

8309411