Graco Inc 308584, 3500WB, 222700 manual Spray Pattern Troubleshooting, Problem, Cause, Solution

Troubleshooting

Spray Pattern Troubleshooting

NOTE: Some spray pattern problems are caused by the improper balance between air and fluid.

Problem

Cause

Solution

Fluttering or spitting spray	The fluid supply is insufficient.	Adjust the fluid regulator, or fill the
		fluid supply.
	The fluid nozzle is loose, or the fluid	Tighten or replace the fluid nozzle;
	nozzle taper seat is damaged.	see page 30.
	There is dirt between the fluid nozzle,	Clean the parts; see page 21.
	taper seat, and gun body.
	The coupler at the fluid inlet is loose	Tighten or repair the coupler.
	or cracked.
Improper spray pattern	There is fluid build-up on the air cap;	Clean the air cap with a soft imple-
	partially clogged horn holes; or full air	ment or submerge it in water and
	pressure from the clean horn hole	wipe it clean; see page 21.
	forces the fan pattern toward the
	clogged end.
	The electrode is bent.	Straighten the electrode.
	The fluid nozzle or air cap holes are	Replace the damaged part; see page
	damaged.	30.
	There is fluid buildup on the perimeter	Remove the obstruction; never use
	of the fluid nozzle orifice, or a partially	wire or hard instruments; see page
	clogged fluid nozzle orifice.	21.
	The electrode is bent.	Straighten the electrode wire.
	The fan air pressure is too high.	Reduce the fan air pressure.
	The fluid is too thin.	Reduce the fluid viscosity.
	There is not enough fluid pressure.	Increase the fluid pressure.
	The fan air pressure is too low.	Increase the fan air pressure.
	The fluid is too thick.	Reduce the fluid viscosity.
	There is too much fluid.	Reduce the fluid flow.
Streaks	The last coat of fluid is applied too	Apply a drier finish using multiple
	wet.	strokes.
	There is too much air pressure.	Decrease the air pressure.
	The air pressure is insufficient.	Increase the air pressure.
	The spray pattern is non-uniform.	Clean or replace the air cap; see
		page 21.

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