Graco Inc 235893, 4600SC, 308-084 manual GUN Operation Troubleshooting Chart, Problem Cause Solution

GUN OPERATION TROUBLESHOOTING CHART

PROBLEM	CAUSE		SOLUTION
Leakage from fluid	Worn fluid rod packings or fluid rod		Replace fluid rod packings or rod.
packing area			See page 23.
Fluid leakage from front	Fluid rod worn or damaged		Replace fluid rod. See page 23.
of gun	Worn fluid seat		Replace fluid nozzle and/or
			electrode. See page 19 and 20.
	Piston seal or o-ring damaged		Replace seal and/or o-ring and
			lubricate.
	Loose resistor stud		Tighten resistor stud. See page 19.
	Loose fluid nozzle		Tighten fluid nozzle. See page 19.
	Damaged resistor stud o-ring		Replace o-ring. See page 19.
“Orange Peel” finish	Insufficient air pressure		Increase air pressure, use least air
			pressure needed for good results.
	Fluid poorly mixed or filtered		Remix or refilter fluid.
	Improper thinner being used		Use proper thinner.
Excessive spray fog	Too much air pressure		Reduce air pressure, use least air
			pressure needed for good results.
	Fluid thinned too much		Properly thin fluid.
No fluid sprays from gun	Fluid low		Check, add fluid if necessary.
	Damaged air cap		Replace air cap.
	Dirty or clogged fluid nozzle		Clean fluid nozzle. See page 11.
	Damaged fluid nozzle		Replace fluid nozzle. See page 19.
	Piston not actuating		Check cylinder (CYL) air.
	Actuator arm out of position		Check actuator arm (29) and
			nuts (25, 7). See page 21.
Equipment covered	Exhaust air flow insufficient		Check for proper CFM; check
with fluid	or not directed properly		baffles and direction of air flow.
	Improper distance between gun		Adjust spraying distance to
	and workpiece		8 to 12 inches (203 to 305 mm).
Dirty air cap	Misalignment between air cap		Remove and clean air cap and fluid
	and fluid nozzle		nozzle. See page 11. Then reinstall
	Air Cap		them.
			Or replace fluid nozzle and air cap.
			See page 19.
	Fluid Nozzle
	ALIGNED	MISALIGNED

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