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311051D 21
Fluid needle will not trigger. Loose or missing fluid needle stop
(29) or setscrew (30).
Air leaking around piston (3).
Swollen piston o-ring (8).
Insufficient air pressure on trigger.
Plug (19) is in incorrect fluid port.
Replace stop or tighten setscrew.
Replace o-ring (8) or piston.
Replace o-ring. Do not immerse pis-
ton in solvent.
Increase air pressure or clean air
line.
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 (11) or (9).
Piston cap (4) not fully tightened.
Spring (6) not in place.
Swollen piston o-ring (8).
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