JET Tools JAT-501 User Manual - Page 10

Troubleshooting JAT-501 Mini HVLP 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. Pressure too high for material viscosity being sprayed. 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. Reduce air pressure. Increase material viscosity. Pattern may also be corrected by narrowing fan size with spray width adjuster control knob. Material bubbles or "boils" in cup. Dirty or distorted air horn holes. One of the air horn holes completely obstructed. Air getting into paint stream. Excess air blowing back into cup. 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. 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. Tighten fluid nozzle. Check fluid nozzle seat. Check for damaged fluid seat on nozzle or seat on gun head. 10 JAT-501 Mini HVLP Spray Gun