Graco PerformAA 26B570 Instructions Manual page 20

Troubleshooting
Problem
Fluid needle will not trigger.
Fluid does not shut off.
20
Cause
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.
Worn o-ring (25).
Piston cap (27) not fully tightened.
Spring (28) not in place.
Swollen piston o-ring (22).
Solution
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.
Replace o-ring.
Tighten piston cap until it bottoms
out.
Check spring position.
Replace o-ring. Do not immerse
piston in solvent
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