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MAINTENANCE & TROUBLESHOOTING
JGA Spray Gun Maintenance Schedule
A. Every Shift
1) Check front air cap face and all air cap holes are free from damage. Replace if necessary
2) Check fluid tip external profile is undamaged. Replace if necessary
4) Check fluid needle is seating correctly in fluid head allowing no seepage. Replace or lap-in if necessary.
5) Turn off pressure tank fluid cock and/or compressed air supply to gun. Trigger gun. Apply one drop of spray gun lubricant to
needle shaft immediately behind fluid needle packing screw. Release trigger. Repeatedly pull and release trigger to work
lubricant into fluid needle packing.
6) Check trigger operates smoothly and fluid needle does not stick or bind up during movement due to damage or paint build-up.
7) Apply single drop of lubricant to each side of trigger pivot screw. Repeatedly pull and release trigger to work lubricant into
trigger pivot.
8) Apply single drop of lubricant to air valve stem. Repeatedly pull and release trigger to work lubricant into air valve packing
seal.
9) Check air valve operates smoothly without sticking. Replace valve stem if necessary.
10) Check needle packing for fluid leakage. If required, tighten the needle packing by rotating packing screw until the needle
starts to bind, then loosen the packing nut just enough so that the needle moves freely. If screw bottoms without eliminating
fluid leak, replace packing with new item.
B. Additional end of week maintenance checks
1) Check air cap retaining ring and gun air baffle threads are free from damage (a smear of Vaseline on the threads will help
prevent binding).
2) Check air baffle seal is not leaking air badly or visibly damaged. Replace if necessary.
3) Apply smear of Vaseline to needle shaft front end for smooth operation.
4) Apply Vaseline to needle shaft rear end and needle spring to aid corrosion and contamination resistance.
5) Check Horn control valve is free to rotate with no stiff spots. Lubricate or replace O ring if necessary.
6) Check Air control valve, if fitted, is free to rotate with no stiff spots. Lubricate or replace O ring if necessary.
7) Check for air leaks from aircap when gun is not triggered. Clean or replace air valve stem or seat if necessary.
8) Check Trigger retaining screw is tight.
9) Check fluid and air inlet connectors are tight and sealed. Tighten if necessary.
C. Additional Bi-weekly maintenance checks
1) Check for air leakage from air valve body when trigger is pulled. Replace air valve seal if necessary.
2) Check fluid needle shaft is not badly worn and needle end profile and point are undamaged.
3) Apply a smear of Vaseline to all air O rings to aid fitting and easy rotation.
4) Check gun body for damage, particularly around air inlet connector port.
5) Check stainless steel head fluid insert, if fitted, for damage to fluid tip seat, swaging or leaks caused by rotation. This item is
not removable or replaceable, and a new gun body will be necessary.
6) Check for damage to air baffle chimney. Replace air baffle assembly if necessary.
7. Apply Vaseline to air valve spring to aid corrosion and contamination resistance.
MAINTENANCE & TROUBLESHOOTING
ITW DeVilbiss
Ringwood Road
Bournemouth
BH11 9LH
Tel: 01202 571111
PAGE 8
Steve Mannouch Oct96
PAGE 8
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