Graco PRO AA4000, Instructions Manual

Page: 12 / 32

12 307-706
GUN OPERATION TROUBLESHOOTING CHART
PROBLEM CAUSE SOLUTION
Air leakage from front of
gun.
Fluid leakage from
front of gun.
Air valve not seating properly. Clean, service. See page 21.
Air stem packing too tight. Loosen packing. See page 21.
Too much air pressure. Reduce,use least air pressure
needed for good results.
Fluid thinned too much. Properly thin fluid.
Excessive spray fog.
Loose or worn fluid seat. Tighten or replace fluid seat and/or
electrode. See page 16.
Loose spray tip. Tighten spray tip.
Insufficient air pressure. Increase, use least air pressure
needed for good results.
Using too large of a spray tip. Use a smaller size spray tip.
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.
Broken fluid needle shaft. Replace needle.
Dirty or clogged spray tip. Clean spray tip. See page 10.
Damaged spray tip. Check, replace spray tip. See page 9.
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.