Spray Pattern Troubleshooting

Troubleshooting

Problem	Cause	Solution


Fluid needle will not trigger.	Loose or missing fluid needle stop	Replace stop or tighten setscrew.
	(29) or setscrew (30).
	Air leaking around piston (3).	Replace o-ring (8) or piston.
	Swollen piston o-ring (8).	Replace o-ring. Do not immerse
		piston in solvent.
	Insufficient air pressure on trigger.	Increase air pressure or clean air
		line.
	Plug (19) is in incorrect fluid port.	Move plug to fluid port consistent
		with manifold plumbing, unless
		you are using gun in a circulating
		system. If you are, all fluid ports in
		gun and on manifold should be
		open.

Fluid does not shut off.	Worn o-ring (11) or (9).	Replace o-ring.
	Piston cap (4) not fully tightened.	Tighten piston cap until it bottoms
		out.
	Spring (6) not in place.	Check spring position.
	Swollen piston o-ring (8).	Replace o-ring. Do not immerse
		piston in solvent.

Problem	Cause	Solution


Fluid flow is fluttering while spray-	Fluid nozzle is not tight enough.	Tighten fluid nozzle to 60 in-lb
ing.		(6.8 N•m).
	O-ring (36) is missing or dam-	Replace o-ring.
	aged.
	Fluid filter is clogged.	Check fluid filter.

Fluid flow fades while spraying	Fluid pressure is too low, causing	Raise fluid pressure at source or
high viscosity fluids.	fluid flow to reduce when gun is	use a smaller fluid nozzle.
	elevated.

Pattern becomes off-set or heavy	Air cap horn holes plugged or	Clean air cap horn holes with
on ends.	damaged.	non-metallic item such as a tooth-
		pick, or replace air cap.

Gun fluid pressure is too high with	Using needle/nozzle kit with too	Use needle/nozzle kit with larger
gun triggered.	small orifice.	orifice.

Fluid system will not operate at	There is no fluid regulator, or air	Add low pressure fluid regulator,
low enough fluid pressure [below	regulator on pressure pot is not	or add more sensitive low pres-
10 psi (70 kPa, 0.7 bar)].	sensitive enough at low pressures.	sure air regulator on pressure pot.

313516C