Graco A-25 important safety instructions Problem Cause Solution

Troubleshooting

PROBLEM	CAUSE	SOLUTION
Fluid pressure low or dropping	Air supply pressure low when spray-	Increase inlet air pressure
	ing
		Increase air compressor size to meet
		flow requirements
		Remove airline quick disconnects
		Use 3/8 in. (0.95 cm) ID or larger air
		supply hose. Use 1/2 in. (12.7 mm) if
		longer than 25 ft (7.6 m).
	Icing in air motor exhausts or mufflers	Check inlet filter water separator; see
		page 25. Stop spraying while ice
		melts.
Pump output low, but pressure is nor-	Obstructed gun impingement ports or	Flush and clean gun; see gun manual
mal	filters
One pressure gauge drops when	Leaking pump throat	Repair pump; see 309577
pumps are stalled on both the
	Leak between pump and gun	Check fluid tubes, heater, and hoses
upstroke and the downstroke
		Pressure Relief/Spray valve leaking
		back to supply
	Spray gun is leaking on one side or	Clean and repair spray gun
	plugged on the other side
One pressure gauge drops when	Inlet ball check not sealing	Clean or replace; see 309577
pumps are stalled on the downstroke,
	Inlet check seat o-ring not sealing	Repair pump; see 309577
but not the upstroke
One pressure gauge drops when	Piston check ball not sealing	Repair pump; see 309577
pumps are stalled on the upstroke,
	Piston packing not sealing	Repair pump; see 309577
but not the downstroke
	Loose piston stud in pump	Repair pump; see 309577
	Bad inside sleeve seal	Repair o-ring; see 309577
A side rich; lack of B side	A side gauge is low	B side restriction downstream of
		gauge. Check gun check valve
		screen, mix module, or mix manifold
		restrictor.
		A side impingement port is worn.
	B side gauge is low	B side material supply problem.
		Check B side inlet strainer and pump
		intake valve.
B side rich; lack of A side	A side gauge is low	A side material supply problem.
		Check A side inlet strainer and pump
		intake valve.
	B side gauge is low	A side restriction downstream of
		gauge. Check gun check valve
		screen, mix module, or mix manifold
		restrictor.
		B side impingement port is worn.

16 3A1570A