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10
JAT-500 HVLP Spray Gun
Troubleshooting JAT-500 Spray Gun
Any disassembly of the tool should be done by qualified service personnel. For problems not addressed
below, contact JET technical service at 800-274-6846.
Problem Possible cause Remedy
Correct normal pattern. No correction necessary.
Dirty or damaged air cap.
Dirty or damaged fluid tip.
Rotate air cap 180-degrees:
If pattern is following air cap,
problem is in air cap. Clean and
inspect. If pattern does not correct,
replacement is necessary.
If pattern is NOT following air cap,
problem is with fluid tip. Clean and
inspect tip for dried paint, dirt or
damage. If pattern does not
correct, replacement is necessary.
Pressure too high for material
viscosity being sprayed.
Reduce air pressure.
Increase material viscosity.
Pattern may also be corrected by
narrowing fan size with spray width
adjuster control knob.
Dirty or distorted air horn holes. Rotate air cap 180-degrees:
If pattern is following air cap,
problem is in air cap. Clean and
inspect the horn holes. If horn
holes are distorted, replacement is
necessary.
One of the air horn holes
completely obstructed.
Air getting into paint stream.
Check and tighten fluid needle
packing nut.
Tighten fluid nozzle.
Check fluid nozzle seat for
damage.
Check for poor gun-to-cup seating.
Check that cup is correctly
fastened on gun.
Material bubbles or “boils”
in cup.
Excess air blowing back into cup. Tighten fluid nozzle.
Check fluid nozzle seat.
Check for damaged fluid seat on
nozzle or seat on gun head.
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