Graco Inc 311279D, 833 important safety instructions Troubleshooting, Problem Cause Solution

		Troubleshooting
	Troubleshooting
PROBLEM	CAUSE	SOLUTION
Gas engine pulls hard (won't start)	Hydraulic pressure is too high	Turn hydraulic pressure knob
		counterclockwise to lowest setting
Gas engine does not start	Switch OFF, low oil, no gasoline	Consult engine manual, supplied
Gas engine doesn't work properly	Faulty engine	Consult engine manual, supplied
Gas engine operates, but	Pump valve is OFF	Set pump valve ON
displacement pump doesn't operate
	Pressure setting too low	Increase pressure, page 12
	Displacement pump outlet filter	Clean the filter
	(if used) is dirty or clogged
	Tip or tip filter (if used) is clogged	Remove tip and/or filter and clean
	Hydraulic fluid too low	Shut off sprayer. Add fluid*
	Belt worn, broken or off	Replace. See manual 311283
	Hydraulic pump worn or damaged	Bring sprayer to Graco distributor for
		repair
	Dried paint seized paint pump rod	Service pump. See manual 311485
	Hydraulic motor not shifting	Set pump valve OFF. Turn pressure
		down. Turn engine OFF. Pry rod up or
		down until hydraulic motor shifts.
		Manual 311283
Displacement pump operates, but	Piston ball check not seating properly	Service piston ball check.
output is low on upstroke		See manual 311485
	Piston packings worn or damaged	Replace packings. See manual
		311485
Displacement pump operates but	Piston packings worn or damaged	Tighten packing nut or replace
output is low on downstroke and/or		packings. See manual 311485
on both strokes
	Intake valve ball check not seating	Service intake valve ball check.
	properly	See manual 311485
	Suction tube air leak
Paint leaks and runs over side of	Loose wet-cup	Tighten wet-cup enough to stop
wetcup		leakage
	Throat packings worn or damaged	Replace packings.
		See manual 311485
Excessive leakage around hydraulic	Piston rod seal worn or damaged	Replace these parts.
motor piston rod wiper		See manual 311283
Fluid delivery is low	Pressure setting too low	Increase pressure, page 4
	Displacement pump outlet filter (if	Clean filter
	used) is dirty or clogged
	Intake line to pump inlet is not tight	Tighten
	Hydraulic motor is worn or damaged	Bring sprayer to Graco distributor
		for repair
	Large pressure drop in fluid hose	Use larger diameter or shorter hose

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