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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
nozzle taper seat is damaged.
Tighten or replace the fluid nozzle;
see page 30.
There is dirt between the fluid nozzle,
taper seat, and gun body.
Clean the parts; see page 21.
The coupler at the fluid inlet is loose
or cracked.
Tighten or repair the coupler.
Improper spray pattern
There is fluid build-up on the air cap;
partially clogged horn holes; or full air
pressure from the clean horn hole
forces the fan pattern toward the
clogged end.
Clean the air cap with a soft imple-
ment or submerge it in water and
wipe it clean; see page 21.
The electrode is bent. Straighten the electrode.
The fluid nozzle or air cap holes are
damaged.
Replace the damaged part; see page
30.
There is fluid buildup on the perimeter
of the fluid nozzle orifice, or a partially
clogged fluid nozzle orifice.
Remove the obstruction; never use
wire or hard instruments; see page
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
wet.
Apply a drier finish using multiple
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.