Graco 288048 Instructions - Parts Manual page 15

Problem
Fluid needle will not trigger
Fluid does not shut off.
311053E
Cause
Loose or missing fluid needle stop
(17) or setscrew (16).
Broken fluid needle (12).
Air leaking around piston (21).
Swollen piston o-ring (22).
Insufficient air pressure on the trig-
ger.
Spray tip (9) is plugged.
Plug (4) is in the incorrect fluid port.
Piston cap (18) not fully tightened.
Spring (19) not in place.
Swollen piston o-ring (22).
Troubleshooting
Solution
Replace stop (17) or tighten setscrew
(16).
Replace fluid needle (12).
Replace o-ring (22) or piston assem-
bly (21).
Replace o-ring (22). Do not immerse
piston in solvent.
Increase the air pressure or clean the
air line.
Clean the spray tip (9).
Move the plug to the fluid port consis-
tent with manifold plumbing, unless
you are using the gun in a circulating
system. If you are, all fluid ports
should be open, both inside the gun
and on the manifold.
Tighten piston cap until it bottoms
out.
Check spring position.
Replace o-ring. Do not immerse pis-
ton in solvent
15