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Troubleshooting
Problem
Fluid needle will not trigger.
Fluid does not shut off.
Spray Pattern Troubleshooting
Problem
Fluid flow is fluttering while spray-
ing.
Fluid flow fades while spraying
high viscosity fluids.
Pattern becomes off-set or heavy
on ends.
Gun fluid pressure is too high with
gun triggered.
Fluid system will not operate at
low enough fluid pressure [below
10 psi (70 kPa, 0.7 bar)].
22
Cause
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.
Worn o-ring (11) or (9).
Piston cap (4) not fully tightened.
Spring (6) not in place.
Swollen piston o-ring (8).
Cause
Fluid nozzle is not tight enough.
O-ring (36) is missing or dam-
aged.
Fluid filter is clogged.
Fluid pressure is too low, causing
fluid flow to reduce when gun is
elevated.
Air cap horn holes plugged or
damaged.
Using needle/nozzle kit with too
small orifice.
There is no fluid regulator, or air
regulator on pressure pot is not
sensitive enough at low pressures.
Solution
Replace stop or tighten setscrew.
Replace o-ring (8) or piston.
Replace o-ring. Do not immerse
piston 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.
Replace o-ring.
Tighten piston cap until it bottoms
out.
Check spring position.
Replace o-ring. Do not immerse
piston in solvent.
Solution
Tighten fluid nozzle to 60 in-lb
(6.8 N•m).
Replace o-ring.
Check fluid filter.
Raise fluid pressure at source or
use a smaller fluid nozzle.
Clean air cap horn holes with
non-metallic item such as a tooth-
pick, or replace air cap.
Use needle/nozzle kit with larger
orifice.
Add low pressure fluid regulator,
or add more sensitive low pres-
sure air regulator on pressure pot.
313516F
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