Graco Inc 218-745, 307-712, PRO 5000 GUN Operation Troubleshooting Chart, Problem Cause Solution

GUN OPERATION TROUBLESHOOTING CHART

PROBLEM	CAUSE	SOLUTION
Leakage from fluid pack-	Worn needle packing.	Replace packing assembly.
ing nut.		See page 20.
Air leakage from front	Air valve not seating properly.	Clean, service. See page 24.
of gun.	Air stem packing too tight.	Loosen packing. See page 24.
Fluid leakage from	Electrode worn or damaged.	Replace electrode. See page 18.
front of gun.	Worn fluid seat.	Replace fluid nozzle and/or electrode.
		See page 18.
	Fluid packing too tight.	Adjust packing screw. See page 20.
	Loose fluid nozzle.	Tighten fluid nozzle. See page 12.
	Cylinder air to gun not completely shut off.	Adjust screw.
ªOrange Peelº finish.	Insufficient air pressure.	Increase, 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, use least air pressure
		needed for good results.
	Fluid thinned too much.	Properly thin fluid.
No fluid sprays from	Fluid low.	Check, add if necessary.
gun.	Damaged air cap.	Replace air cap. See page 12.
	Dirty or clogged fluid nozzle.	Clean fluid nozzle. See page 12.
	Damaged fluid nozzle.	Check, replace fluid nozzle.
		See page 12.
	Air Valve not actuating.	Check cylinder air, fluid needle packing,
		and needle. Replace parts as necessary.
		See page 21.
	Damaged fluid needle	Replace. See page 20.
Equipment covered	Exhaust air flow insufficient or not directed	Check for proper CFM, check baffles
with fluid.	properly.	and direction of air flow.
	Improper distance between gun and	Adjust distance to 203±305 mm
	work piece.	(8±12 in.).
Dirty air cap.	Misalignment between air cap and	Remove and clean air cap and fluid
	fluid nozzle.	nozzle as described on page 12, then
		reinstall them.

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