Troubleshooting
311053L
17
Fluid needle will not trigger
Loose or missing fluid needle stop
(17) or setscrew (16).
Replace stop (17) or tighten setscrew
(16).
Broken fluid needle (12).
Replace fluid needle (12).
Air leaking around piston (21).
Replace o-ring (22) or piston assembly
(21).
Swollen piston o-ring (22).
Replace o-ring (22). Do not immerse
piston in solvent.
Insufficient air pressure on the
trigger.
Increase the air pressure or clean the air
line.
Spray tip (9) is plugged.
Clean the spray tip (9).
Plug (4) is in the incorrect fluid port.
Move the plug to the fluid port consistent
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.
Fluid does not shut off.
Piston cap (18) not fully tightened.
Tighten piston cap until it bottoms out.
Spring (19) not in place.
Check spring position.
Swollen piston o-ring (22).
Replace o-ring. Do not immerse piston in
solvent.
Problem
Cause
Solution