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Old 12-18-2011, 05:26 PM   #1
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Tank will not build up more than 40lbs!


I bought a CH vertical WL6700 series compressor about six months ago. It worked ok for a while, but recently, it will only build up pressujre to a max of 40lbs. I checked all the air lines; no leaks. I thought it may be the check valve, so i replaced it. With the new check valve, it would build no pressure at all. I removed the large spring from the check valve; you (still) get good air in the spray hose, but no more than 40lbs in the tank. I'm about to pitch this thing if i can't figure out what is wrong. When new, it would build to about 120lbs. I also checked the belt (it's new). If you blow into the check valve with the primary button depressed, air will go out the spray hose outlet no problem. You only get about 33% or air coming out the inlet that fills the tank. I can't belive i could have two faulty check valves in a row, so i must be missing something. BTW, when the pump is running, i can barely hold my thumb on the outlet from the pump - so the output from pump seems strong. HELP!

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Old 12-18-2011, 05:40 PM   #2
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Tank will not build up more than 40lbs!


You might do better on the carpenter forum- very few painters use a conventional spray set up with regular air compressors anymore.

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Old 12-18-2011, 06:03 PM   #3
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Tank will not build up more than 40lbs!


Quote:
Originally Posted by 64tbirdJerry View Post
I bought a CH vertical WL6700 series compressor about six months ago. It worked ok for a while, but recently, it will only build up pressujre to a max of 40lbs. I checked all the air lines; no leaks. I thought it may be the check valve, so i replaced it. With the new check valve, it would build no pressure at all. I removed the large spring from the check valve; you (still) get good air in the spray hose, but no more than 40lbs in the tank. I'm about to pitch this thing if i can't figure out what is wrong. When new, it would build to about 120lbs. I also checked the belt (it's new). If you blow into the check valve with the primary button depressed, air will go out the spray hose outlet no problem. You only get about 33% or air coming out the inlet that fills the tank. I can't belive i could have two faulty check valves in a row, so i must be missing something. BTW, when the pump is running, i can barely hold my thumb on the outlet from the pump - so the output from pump seems strong. HELP!
Brush is right, maybe get a mod to move this for you.
Does it build to 40 lbs and shut off or get to 40 and keep running but not get any higher?
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Old 12-18-2011, 07:37 PM   #4
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Tank will not build up more than 40lbs!


You have bled the tank?
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Old 12-18-2011, 10:34 PM   #5
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Tank will not build up more than 40lbs!


I've never seen a compressor with a check valve, are you sure your not messing with the pressure regulator or the safty pop off?
Several times when I had the problum your having it's the line from the tank to the pressure regulater that's came off or has a hole in it. (some have no line and are connected directly to the tank)
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