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14
307-712
GUN OPERA
TION TROUBLESHOOTING CHART
Misalignment
between air cap and
Remove and clean air cap and fluid
fluid nozzle.
nozzle as described on page 12, then
reinstall them.
PROBLEM CAUSE SOLUTION
W
orn needle packing.
Replace packing assembly
.
See page 20.
Air leakage from front
of gun.
Fluid leakage from
front of gun.
Air valve not seating properly
.
Clean, service. See page 24.
Air stem packing too tight. Loosen packing. See page 24.
T
oo much air pressure.
Reduce, use least air pressure
needed for good results.
Fluid thinned too much.
Properly thin fluid.
Excessive spray fog.
Electrode worn or damaged.
Replace electrode. See page 18.
W
orn fluid seat.
Replace fluid nozzle and/or electrode.
See page 18.
Fluid packing too tight.
Adjust packing screw
. See page 20.
Loose fluid nozzle.
T
ighten fluid nozzle. See page 12.
Cylinder air to gun not completely shut of
f.
Adjust screw
.
Leakage from fluid pack-
ing
nut.
Insuf
ficient air pressure.
Increase, use least air pressure
needed for good results.
Fluid poorly mixed or filtered.
Remix or refilter fluid.
Improper thinner being used.
Use proper thinner
.
“Orange Peel” finish.
No fluid sprays from
gun.
Fluid low
.
Check, add if necessary
.
Damaged air cap.
Replace air cap. See page 12.
Dirty or clogged fluid nozzle.
Clean fluid nozzle. See page 12.
Damaged fluid nozzle. Check, replace fluid nozzle.
See page 12.
Air V
alve not actuating. Check cylinder air
, fluid needle packing,
and needle. Replace parts as necessary
.
See page 21.
Damaged fluid needle
Replace. See page 20.
Exhaust air flow insuf
ficient or not directed
Check for proper CFM
, check baf
fles
properly.
and direction of air flow
.
Improper distance between gun and
Adjust distance to 203–305 mm
work piece.
(8–12 in.).
Equipment covered
with fluid.
Dirty air cap.