SPRAY PATTERN PROBLEM

Damon K. · Jul 13, 2014

Hi Guys,
I have a Devilbiss GFG-670 Plus. For the last couple of paint jobs it
has been doing a "pulsating" spray pattern. It will spray nice for 4-5
seconds and cut out (the flow will stop) for a second, and back and
forth like that. The air pressure never changes. It is driving me nuts!
Can anyone please tell me what is wrong so I can fix it. I spray PPG
single stage paint....if you need to know.
Thanks in advance!!
Damon

Mike in Mn. · Jul 13, 2014

Dis-assemble and thoroughly clean the gun, renew or soften and tighten the packing nuts and clean the air vent for the cup. There should be a fine strainer in the base of the cup, maybe plugged. A good cleaning makes my guns spray just like new.

Damon K. · Jul 14, 2014

Not sure if thats it...I clean it very well and lube the threads every time I use it, because you are very rite, they should always be very clean.
However I havent done any thing with the packing nuts, what do I need to do with that process?
I dont see any strainer at the base of the cup, could it be any place else?
Thanks Mike in MN

El Toro · Jul 14, 2014

Have you added enough paint thinner? The directions should be on your paint can. I used the same paint on my tiller in 2006. Hal

El Toro · Jul 14, 2014

I would also call Devilbiss for help. Hal
1-800-445-3988

glennster · Jul 15, 2014

The 670 is a gravity gun. Pull the cup and check the chamber for paint build up. You will probably need to soak the gun in a commercial gun cleaner that contains paint Stripper. Also are you using a strainer when you fill the paint cup? Any lumps in the paint will cause eratic spray patterns.

SPRAY PATTERN PROBLEM

Damon K.

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Mike in Mn.

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Damon K.

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El Toro

Well-known Member

El Toro

Well-known Member

glennster

Well-known Member

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