Question about Campbell Hausfeld Air Tools & Compressors

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The unloader valve on the WL504100AJ leaks air when pumping and after shutoff. Is there a way to replace just the valve or is the only solution to replace the entire regulator module.

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  • kdsix_dvp Jan 03, 2011

    I may have misidentified the valve as the unloader valve. The air leak is inside the regulator module not at the other end of the black tube which connects to the pipe coming out of the lower tank. I've had the cover off the regulator and have lubricated the valve - to no avail. Does this help?

  • kdsix_dvp Jan 04, 2011

    I disassembled the tank end of the air pipe and removed the check valve. Parts of the valve were badly corroded and the spring inside was broken. This definitely needs to be replace.
    Thanks for your help.

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If you are leaking air at the unloader valve, even after the pump shuts off, your problem is the check valve. It's on the tank at the other end of the unloader tube, where the tube from the pump goes into the tank. I can't find a Campbell Hausfeld model #WL504100AJ so I can't tell you which check valve you need. The closest model numbers to yours are WL504311 and WL504312, and both of these use check valve #CV308300AJ.

Posted on Jan 03, 2011

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