Spray Pattern Troubleshooting Chart - Graco H.E.L.P. 1600B Instructions-Parts List Manual

SPRAY PATTERN TROUBLESHOOTING CHART

PROBLEM:
IMPROPER SPRAY
PATTERN
Fluttering or spitting
spray
Streaks
NOTE: Some improper patterns are caused by the improper balance between air and fluid.
CAUSE
Insufficient fluid supply.
Loose fluid nozzle or damaged fluid
nozzle taper seat.
Dirt between fluid nozzle, taper seat
and body.
Loose or cracked fluid inlet fitting (4a).
Loose fluid tube in pressure tank.
Dry or worn fluid needle packings (10, 16)
or loose packing nuts (9) permit air to get
into fluid passage.
Fluid build-up on air cap; partially
clogged horn holes. Full air pressure
from clean horn hole forces fan pattern
toward clogged end.
Damaged fluid nozzle or air cap holes.
Fluid build-up on the perimeter of fluid
nozzle orifice, or partially clogged fluid
nozzle orifice.
Too high atomization air pressure.
Fluid too thin.
Not enough fluid pressure.
Low atomization 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 (2) and
needle (1).
Clean.
Tighten or replace fitting.
Tighten fluid tube.
Lubricate or replace packings;
tighten packing nuts.
Clean with soft implement or
submerge in suitable solvent and
wipe clean.
Replace damaged part.
Remove obstruction. Never use wire
or hard instruments.
Reduce air pressure or adjust air
adjusting valve (5).
Regulate fluid viscosity.
Increase fluid pressure.
Increase air pressure or adjust air
adjusting valve (5).
Regulate fluid viscosity.
Reduce fluid pressure.
Adjust fluid adjusting valve (6) until
proper pattern is obtained.
Apply drier finish with multiple
strokes.
Use least air pressure necessary.
Increase air pressure.
Clean or replace air cap.