Graco 309550Y Instructions - Parts Manual page 24

Troubleshooting
PROBLEM
A and/or B fluid in gun air section.
Fluid mist from mix chamber or air
cap.
Excessive overspray.
Rapid buildup of material on air cap.
Reduced cleanoff air.
Excessive cleanoff air when fluid
valves are closed and gun is trig-
gered.
Fluid does not shut off when fluid
valves are closed.
Burst of air from muffler when gun is
triggered.
Steady air leakage from muffler.
Air leakage from front air valve.
Air leak around lock ring.
Cannot tighten retaining ring (9) until
it bottoms out.
24
CAUSE
Damaged side seals (18c).
Damaged mix chamber (19).
Damaged side seal o-rings (18d,
18e).
Tightened air cap with fluid valves
(12b) open.
Damaged side seals (18c).
Damaged side seal o-rings (18d,
18e).
Damaged mix chamber (19).
Too much cleanoff air.
Plugged air cap holes.
Too little cleanoff air.
Damaged/missing fluid housing
o-ring (23).
Damaged front o-ring (3).
Damaged front o-ring (3).
Damaged/missing fluid housing
o-ring (23).
Damaged fluid valves (12b).
Normal.
Damaged air valve o-rings (24).
Damaged piston o-rings (16, 17).
Damaged air valve o-rings (24).
Damaged o-ring (21).
Air cap (10) assembled before retain-
ing ring (9).
SOLUTION
Replace, page 29.
Replace, page 29.
Replace, page 29.
Close valves first.
Replace, page 29.
Replace, page 29.
Replace, page 29.
Reduce, page 13.
Clean, page 20.
Increase, page 13.
Replace, page 29.
Replace, page 29.
Replace, page 29.
Replace, page 29.
Replace.
No action required.
Replace, page 33.
Replace, page 32.
Replace, page 33.
Replace, page 29.
Install retaining ring (9) first, then air
cap (10), page 30.
309550Y