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Troubleshooting
18 311052H
Fluid needle will not trigger. Loose or missing fluid needle stop
(21) or setscrew (19).
Broken fluid needle (14).
Air leaking around piston (20).
Swollen piston o-ring (22).
Insufficient air pressure on trigger.
Spray tip (9) is plugged.
Fluid filter is plugged.
Plug (5) is in incorrect fluid port.
Replace stop or tighten setscrew.
Replace fluid needle.
Replace o-ring (22) or piston assem-
bly (20).
Replace o-ring. Do not immerse pis-
ton in solvent.
Increase air pressure or clean air
line.
Clean spray tip and air cap (30).
Clean or replace filter.
Move plug to fluid port consistent with
manifold plumbing, unless you are
using gun in a circulating system. If
you are, all fluid ports in gun and on
manifold should be open.
Fluid does not shut off. Worn o-ring (25).
Piston cap (27) not fully tightened.
Spring (28) not in place.
Swollen piston o-ring (22).
Replace o-ring.
Tighten piston cap until it bottoms
out.
Check spring position.
Replace o-ring. Do not immerse pis-
ton in solvent
Problem Cause Solution