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13
307-712
SPRAY
P
A
TTERN TROUBLESHOOTING CHART
WARNING
Installing
and servicing this equipment requires access to parts which may cause electric shock or other serious
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 W
arning
on page 9 before checking, adjusting, cleaning or repairing the gun or
any
part of the system. Disconnect the fluid hose from the gun.
NOTE:
Check all possible remedies in the T
roubleshooting Charts before disassembling the gun.
PROBLEM: CAUSE
SOLUTION
IMPROPER SPRA
Y
PATTERN
Insuf
ficient fluid supply
.
Adjust fluid regulator or fill fluid tank.
Loose fluid nozzle or damaged fluid
T
ighten or replace fluid nozzle
nozzle taper seat.
See page 12.
Dirt between fluid nozzle, taper seat
Clean. See page 12.
and body
.
Loose or cracked coupler at fluid inlet.
T
ighten or repair
.
Loose fluid tube in cup or tank.
Tighten.
Fluid build-up on air cap; partially
Clean with soft implement or
clogged horn holes. Full air pressure
submerge in suitable solvent and wipe
from clean horn hole forces fan pattern
clean. See page 12.
toward clogged end.
Damaged fluid nozzle or air cap holes. Replace damaged part. See page 12.
Fluid build-up on the perimeter of fluid
Remove obstruction. Never use wire
nozzle orifice, or partially clogged fluid
or hard instruments. See page 12.
nozzle orifice.
T
oo high atomization air pressure.
Reduce air pressure or adjust air
adjusting valve.
Fluid too thin.
Regulate fluid viscosity
.
Not enough fluid pressure.
Increase fluid pressure.
Low atomization air pressure.
Increase air pressure.
Fluid too thick.
Regulate fluid viscosity
.
T
oo much fluid.
Reduce fluid flow
. Reduce fluid
pressure on pressure feed guns and/
or adjust fluid adjusting screw until
proper pattern is obtained.
Last coat of fluid applied too wet.
Apply drier finish with multiple
strokes.
T
oo much air pressure.
Use least air pressure necessary
.
Insuf
ficient air pressure.
Increase air pressure.
Non-uniform spray pattern.
Clean or replace air cap.
See page 12.
Fluttering or spitting
spray
Streaks
NOTE:
Some improper patterns are caused by the improper balance between air and fluid.