Spray Pattern Troubleshooting - Graco PRO 5500wb Instructions-Parts List Manual

Spray Pattern Troubleshooting

NOTE: Some spray pattern problems are caused by the improper balance between air and fluid.
Problem
Fluttering or spitting spray
Streaks
32 308496
Troubleshooting
Cause
The fluid supply is insufficient.
The fluid nozzle is loose, or the fluid
nozzle taper seat is damaged.
There is dirt between the fluid nozzle,
taper seat, and gun body.
The coupler at the fluid inlet is loose
or cracked.
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.
The electrode is bent.
The fluid nozzle or air cap holes are
damaged.
There is fluid buildup on the perimeter
of the fluid nozzle orifice, or a partially
clogged fluid nozzle orifice.
The electrode is bent.
The fan air pressure is too high.
The fluid is too thin.
There is not enough fluid pressure.
The fan air pressure is too low.
The fluid is too thick.
There is too much fluid.
The last coat of fluid is applied too
wet.
There is too much air pressure.
The air pressure is insufficient.
The spray pattern is non-uniform.
Solution
Adjust the fluid regulator, or fill the
fluid supply.
Tighten or replace the fluid nozzle;
see page 36.
Clean the parts; see page 24.
Tighten or repair the coupler.
Clean the air cap with a soft imple-
ment or submerge it in water and
wipe it clean; see page 24.
Straighten the electrode.
Replace the damaged part; see page
36.
Remove the obstruction; never use
wire or hard instruments; see page
24.
Straighten the electrode wire.
Reduce the fan air pressure.
Reduce the fluid viscosity.
Increase the fluid pressure.
Increase the fan air pressure.
Reduce the fluid viscosity.
Reduce the fluid flow.
Apply a drier finish using multiple
strokes.
Decrease the air pressure.
Increase the air pressure.
Clean or replace the air cap; see
page 24.