Troubleshooting
20
3A8553A
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
assembly (20).
Replace o-ring. Do not immerse
piston 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
piston in solvent
Problem
Cause
Solution
