Graco Inc. 218-745 - Manual (Page 14)

14 307-712
GUN OPERATION 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
Worn 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.
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 12.
Cylinder air to gun not completely shut off. 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 12.
Dirty or clogged fluid nozzle. Clean fluid nozzle. See page 12.
Damaged fluid nozzle. Check, replace fluid nozzle.
See page 12.
Air Valve 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 insufficient or not directed Check for proper CFM, check baffles
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.