14
307-638
GUN OPERATION 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
Worn 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.
Too 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.
Worn fluid seat.
Replace fluid nozzle and/or electrode.
See page 18.
Fluid packing too tight.
Adjust packing screw. See page 20.
Loose fluid nozzle.
Tighten 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 11.
Damaged fluid nozzle.
Check, replace fluid nozzle. See page 10.
Exhaust air flow insufficient or not directed
Check for proper CFM, check baffles 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.
Summary of Contents for 218-026
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