Graco PRO Xs4 AA manual Gun Operation Troubleshooting

Troubleshooting

Gun Operation Troubleshooting

Problem	Cause	Solution
Excessive spray fog.	Atomizing air pressure too high.	Close atomizing air valve some, or
		decrease air pressure as low as pos-
		sible; minimum 40 psi (0.28 MPa, 2.8
		bar) needed at gun for full voltage.
	Fluid too thin.	Increase viscosity.
“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 page 48.
	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 shaft.	Replace fluid needle assembly (26);
area		see page 31.
Air leaks from the front of the gun	Air valve (21) is not seating properly.	Clean and service air valve; see
		page 36.
Fluid leakage from the front of the	Worn or damaged fluid needle ball.	Replace fluid needle (26); see page
gun		31.
	Worn fluid seat housing (2).	Replace seat housing; see page 27.
	Loose spray tip (3).	Tighten retaining ring (27); see page
		27.
	Damaged tip seal (3a).	Replace; see page 27.
Gun does not spray	Low fluid supply.	Add fluid if necessary.
	Damaged spray tip (3).	Replace; see page 27.
	Dirty or clogged spray tip (3).	Clean; see gun operation manual.
	Damaged fluid needle (26).	Replace; see page 31.
Dirty air cap	Damaged or plugged air cap (9).	Clean air cap; see gun operation
		manual.

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