Spray Pattern Troubleshooting Chart - Graco PRO 224-094 Instructions Manual

SPRAY PATTERN TROUBLESHOOTING CHART

Installing and servicing this equipment requires access to parts which may cause electrostatic shock or other seri-
ous bodily injury if the work is not performed properly. Do not install or service this equipment unless you are trained
and qualified.
To reduce the risk of serious bodily injury, including splashing fluid or solvent in the eyes or on the skin, always follow
the Pressure Relief Procedure on page 9 before checking, adjusting, cleaning or repairing the gun or any part of
the system.
NOTE: Check all possible remedies in the Troubleshooting Charts before disassembling the gun.
PROBLEM:
IMPROPER SPRAY
PATTERN
Fluttering or spitting spray
Streaks
NOTE: Some improper patterns are caused by the improper balance between air and fluid.
WARNING
CAUSE
Insufficient fluid supply.
Loose fluid nozzle or damaged
fluid nozzle taper seat.
Dirt between fluid nozzle, taper
seat and body.
Loose or cracked coupler at
fluid inlet.
Loose fluid tube in tank.
Fluid build-up on air cap; partially
clogged horn holes. Full air pres-
sure from clean horn hole forces
fan pattern toward clogged end.
Bent electrode.
Damaged fluid nozzle or air
cap holes.
Fluid build-up on the perimeter
of fluid nozzle orifice, or partially
clogged fluid nozzle orifice
Bent electrode.
Too high fan air pressure.
Fluid too thin.
Not enough fluid pressure
Low fan air pressure
Fluid too thick
Too much fluid.
Last coat of fluid applied too wet.
Too much air pressure.
Insufficient air pressure.
Non-uniform spray pattern.
SOLUTION
Adjust fluid regulator or fill fluid tank.
Tighten or replace fluid nozzle.
See page 19.
Clean. See page 11.
Tighten or repair.
Tighten.
Clean with soft implement or
submerge in suitable solvent and
wipe clean. See page 11.
Straighten electrode
Replace damaged part. See
page 19.
Remove obstruction. Never use
wire or hard instruments. See
page 11.
Straighten electrode
Reduce air pressure or adjust fan
air adjusting valve.
Regulate fluid viscosity.
Increase fluid pressure.
Increase air pressure.
Regulate fluid viscosity.
Reduce fluid flow.
Apply drier finish with multiple
strokes.
Use least air pressure necessary.
Increase air pressure.
Clean or replace air cap. See
page 11.