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Won't prime. Won't pick up paint. Works on and off. More off.

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The spring and pump plunger is not working due to paint build up try running solvent into the spray gun head and pump and let set for a couple of hours if this does not clean it up then I would suggest you by murat-ic acid from a pool shop and immerse the head in the murat-ic acid, when doing so do not breath the fumes and put it out in the open where there is no sparks. Let it stay in the murat-ic acid for a couple of ours this will eat away any organic material that has the gun plugged. wash throughly with fresh water before using.

Posted on Oct 02, 2009

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One cause for this is that one or both of the check balls in the piston are frozen in place. This can be caused by drying paint on the check balls or seats or, as is the case many times in our area, if you did clean the machine well with water without any airless conditioner in it, sometimes the water dries and leave behind minerals that 'lock' the check balls in the seats. Set the machine up in water and turn it on to prime. Using a hammer hit the pump head where the piston is working fairly hard. You are trying not to break anything but knock the check balls loose. If they come loose and water starts cycling through the system, let run a while to wash anything out before switching to paint. If this doesn't work, you may have to take the head apart to see why the check balls won't free up. It could be because of peices of dried paint that won't come loose by themselves.

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