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  1. J

    My CAT 426 Project

    We have a 1988 Cat 426 out here in NV. It only had the right side door and both windows when we got it. We took all the glass out and I don't really have any use for the door or window frames. If you're interested. let me know.
  2. J

    Interesting issue after replacing all resolver O rings on Cat 426

    OK, problem solved. After laying under the backhoe for about 30 minutes trying to trace lines and figure out where I went wrong, it finally occurred to me that I replaced all the O rings, even in the AUX circuit, but hadn't been able to test those because we have nothing hooked up to the AUX...
  3. J

    Interesting issue after replacing all resolver O rings on Cat 426

    I was able to get a gauge on the system this morning. For some reason, signal pressure is all the way up at 2500psi. Pump pressure discharge tap is also at 2500psi with all controls in hold. Just to test, I backed out the Flow Compensator spool to lower the signal pressure down to destroke...
  4. J

    Interesting issue after replacing all resolver O rings on Cat 426

    A bit more information... Still working on acquiring gauges. In the mean time, I read there can possibly be air trapped in the signal line. I loosened the signal line where it feeds back into the pump and actuated all controls. While it was loose/leaking, the pump did destroke completely. I...
  5. J

    Interesting issue after replacing all resolver O rings on Cat 426

    Thank you for taking the time to reply. You are correct, I don't think it is destroking all the way. Under the troubleshooting section, it says the signal line may be vented. I can't find anywhere in the manual about how to bleed or vent the signal line. Do you have any tips? Perhaps I got...
  6. J

    Interesting issue after replacing all resolver O rings on Cat 426

    1988 Cat 426 Boom was very slow to come up... so slow in fact that it wouldn't build enough momentum to lock in transit mode. Over the last couple days I've replaced every O ring on every resolver, both primary and secondary. While doing so, there were only remnants of what were once O rings...
  7. J

    How to lock Cat 426 backhoe in transit mode

    Thank you very much. That seems similar to the Case, I just don't know if I ever got the Cat past the 'half way' point where it transitions. Again, thank you for the video link. Just wanted to make sure I wasn't missing anything obvious.
  8. J

    How to lock Cat 426 backhoe in transit mode

    Hello, Dumb question, but can't find the answer. 1988 Cat 426 backhoe... I can't seem to get enough momentum to latch the rear backhoe, even with the RPM's up. On my old Case 580k, it would tilt back quickly and build enough momentum to lock into place. Is there a trick to getting it far...
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