Question about RTO Cupless Devilbiss Gti-620g Millennium Hvlp Spray Gun

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I have a devilbiss gti suction feed and for some reason my gun is putting pressure in the pot insteed of sucking the paint out. anyone have any ideas. Thanks Darrell

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It seems that for any reason the cables are inverted so try to (invert) change the cables poles.

Posted on Nov 09, 2010

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First start with the basics, whats the paint VISCOCITY ON A FORD 4 CUP ??
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If its thin enough to go up the tube and lines, whats the fluid tip and air cap combo your using?? maybe start with a EX fluid tip (1.8mm) and 30b air cap (cos that sprays everything!!) and reduce from there.

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It looks like you have a Devilbiss SRI.

Probaby the hole in the lid is blocked, The gun sprays, paint gets sucked out, no air can get back in through the little hole in the lid to replace so it stops spraying, pressures even up it sprays abit more, and so on.

Either that or you have a damaged fluid tip.


regards

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Binks bbr converting from pressure to siphon


Worked in paint repair shop for 18+ years. Every time we had that issue it was the wrong air cap. The particular model we always had trouble with was a Devilbiss JGA going from a pressurized system to a 1 quart cup. But the Devilbiss and Binks are quite similar.
The air cap from the pressurized system would actually cause a reverse pressure in the cup.
Both air caps were for this gun. Also the Devilbiss
rep said they should be interchangeable.
They weren't. Try a different air cap.
I'm kind of curious so please let me know if this works for your Binks.
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