Question about DeVilbiss Gti-620g Millennium Hvlp Auto Paint Spray Gun

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I have a GTI millinem gravity feed hvlp gun. It is new. I ran some solvent through it to see if it was functioning properly before using it to paint. The gun pulses every 1-3 seconds. I made sure everything was tight including the packing nut. The pulsing persists. Doesn't matter the air pressure or fan size. This is a BIG deal as I have a paint booth rented for the next 2 days.

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  • Master
  • 2,428 Answers

Check the packing nut on the trigger where the neddle valve slides through the trigger a bad seal there will make this happen

Posted on Apr 06, 2011

  • JOHN LAPIER Apr 06, 2011

    Also if the gun is brand new it could be the thinner is to thin to seal this seal and the paint may so test it with paint

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1 Answer

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I've found over the years the least amount of times you can tear a spray gun completely apart the better. Usually a real good 'flushing' with lacquer thinner will suffice. I will take the air cap off and let it soak in thinner to dislodge any build up but other than that, I simply run thinner thru till it runs clear out the tip.

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Then you place a clean shop towel or rag over the air cap of the gun and pull the trigger. This forces air back into the paint cup 'back flushing' the gun. Then take the rag away from the cap and pull the trigger again to run thinner thru the gun the normal way.

IF you still want to tear the gun apart for cleaning you can hopefully get some idea with this video link;

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