Graco 3A2495C important safety instructions Gun Operation Troubleshooting

Troubleshooting

Gun Operation Troubleshooting

Problem	Cause	Solution
Excessive spray fog.	Atomizing air pressure too high.	Close atomizing air valve part way,
		or decrease air pressure as low
		as possible; minimum 45 psi (0.32
		MPa, 3.2 bar) needed at gun for
		full voltage.
	Fluid too thin.	Increase viscosity or increase fluid
		flow rate.
“Orange Peel” finish.	Atomizing air pressure too low.	Open atomizing air valve more or
		increase gun air inlet pressure;
		use lowest air pressure necessary.
	Spray tip is too large.	Use smaller tip. See Spray Tip
		Selection Chart, page 62.
	Poorly mixed or filtered fluid.	Remix or refilter fluid.
	Fluid too thick.	Reduce viscosity.
Fluid leaks from the fluid packing	Worn fluid needle packings or rod.	See Fluid Needle Replacement,
area.		page 44.
Air leaks from the front of the gun.	Air valve is not seating properly.	See Air Valve Repair, page 51.
Fluid leakage from the front of the	Worn or damaged fluid needle ball.	See Fluid Needle Replacement,
gun.		page 44.
	Worn fluid seat housing.	See Air Cap, Spray Tip, and Fluid
		Seat Housing Replacement, page
		40.
	Loose spray tip.	Tighten retaining ring.
	Damaged tip seal.	See Air Cap, Spray Tip, and Fluid
		Seat Housing Replacement, page
		40.
Gun does not spray.	Low fluid supply.	Add fluid if necessary.
	Damaged spray tip.	Replace.
	Dirty or clogged spray tip.	Clean. See
		Clean the Gun Daily, page 29.
	Damaged fluid needle.	See Fluid Needle Replacement,
		page 44.
Dirty air cap.	Damaged or plugged air cap.	Clean air cap. See
		Clean the Gun Daily, page 29.
Excessive paint wrap back to	Poor grounding.	See Grounding, page 21.
operator.
	Incorrect distance from gun to part.	Should be 8–12 in. (200–300 mm).

36 3A2495C