Gun Operation Troubleshooting Chart - Graco 218-026 Instructions-Parts List Manual

GUN OPERATION TROUBLESHOOTING CHART

PROBLEM
Leakage from fluid pack-
ing nut.
Air leakage from front of
gun.
Fluid leakage from
front of gun.
"Orange Peel" finish.
Excessive spray fog.
No fluid sprays from
gun.
Equipment covered
with fluid.
Dirty air cap.
CAUSE
Worn needle packing.
Air valve not seating properly.
Air stem packing too tight.
Electrode worn or damaged.
Worn fluid seat.
Fluid packing too tight.
Loose fluid nozzle.
Fluid adjusting screw not set correctly.
Insufficient air pressure.
Fluid poorly mixed or filtered.
Improper thinner being used.
Too much air pressure.
Fluid thinned too much.
Fluid low.
Damaged air cap.
Dirty or clogged fluid nozzle.
Damaged fluid nozzle.
Exhaust air flow insufficient or not directed
properly.
Improper distance between gun and
work piece.
Misalignment between air cap and
fluid nozzle.
SOLUTION
Replace packing assembly. See page 21.
Clean, service. See page 24.
Loosen packing. See page 24.
Replace electrode. See page 18.
Replace fluid nozzle and/or electrode.
See page 18.
Adjust packing screw. See page 20.
Tighten fluid nozzle. See page 10.
Adjust screw.
Increase, use least air pressure needed
for good results.
Remix or refilter fluid.
Use proper thinner.
Reduce,use least air pressure needed
for good results.
Properly thin fluid.
Check, add if necessary.
Replace air cap. See page 10.
Clean fluid nozzle. See page 11.
Check, replace fluid nozzle. See page 10.
Check for proper CFM, check baffles and
direction of air flow.
Adjust distance to 203–305 mm (8–12 in.).
Remove and clean air cap and fluid nozzle
as described in Maintenance Section under
Clean the Air Cap and Fluid Nozzle,
then reinstall them.