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Paint gun issues...help...(long)

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04-22-2002 17:00:54

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Bought a Craftsman spray gun, model 919.155350..

Painted the Lawnmower deck, and some chair with it last year. This spring I have primed the hood for the 8n and am now working on a trailer..(A swap for some garden work...Luv that l'il tractor) and then I blew it. I overtightened the spray nozzle and had to get a replacement.no problems call sears and for $40.00 i can get a nozzle delivered..done...now the thing sprays in pulses..never even, just puff,,,,,puff,,,puff air seems steady, replaced the air valve gasket..oiled packings etc...cleaned every orifice per manual...and still puff,,,,puff,,,puff I am using regular tractor and implement paint from carquest, and VMP Naptha thinner per instructions..

Does anyone know why my paint gun is puffin ?? It's 49 years younger then the tractor, and it won't quit..


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duey in MN

04-23-2002 20:38:27

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 Re: Paint gun issues...help...(long) in reply to Custer, 04-22-2002 17:00:54  
On a siphon type gun set up, if it's spitting, that means it is drawing air in with the paint as it is drawn up the pipe to the nozzle. Could be the needle seal under the gland nut half way back to the trigger or where the cup attaches to the gun head. The 'spitting' is the bubbles coming out with the paint.

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Ultradog MN

04-22-2002 18:21:52

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 Re: Paint gun issues...help...(long) in reply to Custer, 04-22-2002 17:00:54  
Is that one of those airless sprayers or is it the type that you hook to your air compressor?
Got a hunch it's an airless you are talking about.
If they're not cleaned properly when you are done with them they can be a super pain.
Try running some lacquer thinner of MEK through it.

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Don, Luling LA

04-22-2002 18:12:04

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 Re: Paint gun issues...help...(long) in reply to Custer, 04-22-2002 17:00:54  
Does the spray nozzle have a gasket to seal it against the gun. Have had them do that puffin and was usually a loose or improperly sealed spray nozzle. The other thing it could be, is they sent the wrong spray nozzle, make sure it's the same number as the old one. One last thing know you said you cleaned every orifice but make sure you are don't have the spray cup vent plugged. I always pull the teflon seal for the cup to insure the little groove to the vent isn't plugged. That has happened before, you may have done that though.
The best thing I have found to clean those guns is laquer thinner, it eats up most any paint.
Hope this helps

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Custer (Followup ??)

04-23-2002 05:29:29

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 Re: Re: Paint gun issues...help...(long) in reply to Don, Luling LA, 04-22-2002 18:12:04  
I use laquer thinner...and when I cleaned the gun I followed instructions..by turning the gun upside down and letting the thinner stream through the vent. The nozzle does not have a number on it, but visually it seems the same as the one I broke. There is no gasket for the nozzle on this gun, it has pipe threads...(Cleaned....gun and nozzle)

Still stumped...

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