Graco Inc 261820 General Problem Low or Fluctuating Output, Prime/Spray Valve Kit, Switch Kit

Advanced Troubleshooting

General Problem: Low or Fluctuating Output

Specific Problem	Cause	Solution
Pump cycles, but output is low or	See Basic Troubleshooting,
surging.	page 11.
	Worn or obstructed inlet and	Check for worn pump valves as follows:
	outlet valves.	Prime sprayer with paint. Turn the Prime/Spray valve
		to SPRAY position. Turn pressure control fully
		clockwise.
		Trigger spray gun briefly.
		When spray gun trigger is released pump should
		cycle momentarily and stop.
		If pump continues to cycle, pump valves may be
		worn or obstructed.
		For replacement inlet and outlet valve kits, see List
		of Kits, page 26.
	Prime/Spray valve is leaking out	Check Prime/Spray valve for debris trapped on seat
	drain line when Prime/Spray	and for worn parts. Torque to 130-180 in-lb
	valve is in SPRAY position.	(15.8-18.1 N•m). Replace if parts are worn using
		Prime/Spray Valve Kit, page 26.
	Voltage from electrical outlet is	Check voltage of outlet. Meter must read 85 to 130V
	too low. Low voltages reduce	AC.
	sprayer performance.
	Extension cord is too long or not	Replace extension cord.
	heavy enough gauge.	See Grounding and Electrical Requirements,
		page 6.
	Leads from motor or pressure	Be sure terminals are centered and firmly
	switch to control board are	connected. Inspect for pinched wiring and wiring
	damaged, loose, pinched, or	insulation and terminals for signs of overheating.
	overheated.	Replace any loose terminals or damaged wiring.
		Securely reconnect terminals.
	Motor brushes are worn.	Check length of BOTH brushes (brushes do not
		wear evenly on both sides of the motor). Brush
		length must be 0.25 in. (6.4mm). If brushes are worn
		replace motor using Motor Kit, page 26.
	Motor brush springs are broken.	If springs are broken, replace motor using Motor Kit,
		page 26.
	Motor brushes are binding in	Clean brush holders. Remove carbon dust with small
	brush holders.	cleaning brush.
	Motor stops before sprayer	Replace pressure control using Pressure Control
	reaches correct pressure (stall	Switch Kit, page 26.
	pressure is too low).
	Control board is damaged.	See Control Board Diagnostics, page 25. If
	CAUTION: Do not perform	damaged, replace control board using Control
		Board Kit, page 26.
	control board diagnostics until
	you have determined the
	armature is good. A damaged
	armature can burn out a good
	control board.

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