Graco A-25 important safety instructions Electronics, Problem Cause Solution

Troubleshooting

PROBLEM	CAUSE	SOLUTION
Fluid pressures not balanced	Fluid viscosities not equal	Adjust A and B temperature settings
between A and B side		to balance viscosity. Sometimes nor-
		mal if pressure offset is below 200 psi
		(14 bar)
		Preheat material in drums by recircu-
		lating; see Operation manual
	Inlet Y-strainer screen plugged on low	Clean inlet filter screen
	pressure side
	Gun port or filter plugged on high	Clean or replace; see gun manual
	pressure side
	Pump inlet ball not seating or sticking	Clean seating; see pump manual
	Drum fluid outlet supply hose too	Use 3/4 in. (1.9 cm) ID hose with
	small	short length
	Low side feed pump not working	Turn on or repair feed pump
	Pressure Relief/Spray valve leaking
	back to supply
Pump does not reverse direction	Obstruction of air motor or pumps	Check and clear obstruction
Unequal fluid pressure between	Feed pumps boost pressure on up	Reduce feed pump pressures
UP/DOWN stroke	stroke.
Air motor doesn’t move with air pres-	Damaged air valve	Replace or service air valve. See Air
sure applied		Motor manual.
	Damaged pilot valve	Replace valve. See Air Motor man-
		ual.
	Park valve left open or leaking
Pump movement speed is erratic	Worn air motor seals	Replace seals. See Air Motor man-
		ual.
	Worn pump seals	Replace seals; see Pump manual.

Electronics

Problem	Cause	Solution
		Plug in power cord.
	No power.	Turn disconnect ON	.
Display does not illuminate.
	Low voltage.	Ensure input voltage is within specifi-
		cations, page 36.
	Loose wire.	Check connections, page 36.
	Display disconnected.	Check cable connections, page 36.
	Display disconnected.	Check cable connections, page 36.
	Display cable damaged or corroded.	Clean connections; replace cable if is
		damaged.
Temperature display does not
illuminate.

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