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  1. R

    m939 air system check valve

    I'd check the easy stuff first like a stuck air govonor . Or stuck unloaded valve first. Also any air leaks like a tank drain left open or a hose that may have had water in it and froze over the winter and cracked.
  2. R

    m939 air system check valve

    Any hose place that makes up hydraulic hoses and fuel lines can make 1 up for you. Also places that repair hydraulic cylinders should have all the fittings to make it as well
  3. R

    m939 air system check valve

    Went to Henrys Engineering in Prince Fredrick Md. Took my old 1 with me and they made me a stainless braided Teflon lined hose. They had to give me 2 pipe adapters with it. And I had to use the 2 old fittings to reattach it to the original copper pipe. I'm so glad I have it fixed. It about wore...
  4. R

    m939 air system check valve

    Went to my local hose maker today and $20.00 later I now have a m923 a1 that has 120 psi of air in about 4 1/2 minutes while idling. No more 20 min of 1500 rpm to get it pumped up :-)
  5. R

    m939 air system check valve

    I had that line off and checked it in my shop.also used soapy water to check it installed. I checked all the lines under the hood with soapy water.
  6. R

    m939 air system check valve

    I believe I have found my air problem that has drove me nuts !! the flex line between the engine and the frame had a good size hole under the sheath so you couldn't see it . I was working on the unloader valve on the compressor and washed all the parts down with wd40 . And noticed a mist by the...
  7. R

    m939 air system check valve

    I replaced mine hoping it would fix my problem. But when I took the old 1 out it was like new inside. replaced the air governor . next im digging in to the unloader valve.
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