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14 307-638
GUN OPERA
TION TROUBLESHOOTING CHART
Misalignment
between air cap and
Remove and clean air cap and fluid nozzle
fluid nozzle. as described in Maintenance Section under
Clean the Air Cap and Fluid Nozzle
,
then reinstall them.
PROBLEM CAUSE SOLUTION
W
orn needle packing.
Replace packing assembly
. See page 21.
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 10.
Fluid adjusting screw not set correctly
.
Adjust screw
.
Leakage
from fluid pack
-
ing nut.
Insufficient
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 10.
Dirty or clogged fluid nozzle.
Clean fluid nozzle. See page 1
1.
Damaged fluid nozzle.
Check, replace fluid nozzle. See page 10.
Exhaust air flow insuf
ficient or not directed
Check for proper CFM, check baf
fles and
properly.
direction of air flow
.
Improper distance between gun and Adjust distance to 203–305 mm (8–12 in.).
work piece.
Equipment
covered
with fluid.
Dirty air cap.