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Troubleshooting
Spray Gun Problems
PROBLEM CAUSE SOLUTION
No or slow fluid flow,
intermittent spray, or
fluttering spray
Wrong size fluid set being used or the
o–ring on nozzle is missing
Select the proper fluid set for the fluid
being sprayed (see page 8) or put an
o–ring on the nozzle.
Gun fluid nozzle blocked by dried
paint, or damaged
Clean or replace fluid nozzle.
Cup or pressure pot cover not tight
enough, or gasket damaged
Tighten cover or replace gasket.
Cup or pressure pot fluid tube blocked
by dried paint or damaged
Clean or replace fluid tube.
Air flow to cup blocked To check, remove the cup (leave cover
connected), trigger the gun and check
for air flow out of the duckbill valve. If
air is not flowing freely, clean or
replace the duckbill valve.
Needle packings not properly adjusted
NOTE: Fluid loss though the packings
affects fluid pressure and causes a
fluid leak from the gun body.
Clean the gun body with solvent and
the brush provided. Adjust the needle
packings.
Plugged inlet strainer Replace strainer if plugged or remove
strainer if material is highly viscous.
Fluid leaks at fluid nozzle
after the trigger is released
Needle not seating in fluid nozzle Check for a loose fluid nozzle or a
bent nozzle or needle; tighten the
nozzle or replace parts as needed.
Poor spray pattern Air cap horn holes and/or fluid nozzle
plugged
Soak air cap and/or fluid nozzle in
solvent. Clean air cap horn holes with
non-metallic item to avoid permanently
damaging them. See page 14.
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