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Cat 304 wont swing or walk

Discussion in 'Compact Excavators' started by OMDKprop, Dec 8, 2020.

  1. OMDKprop

    OMDKprop Member

    Dec 8, 2020
    Been super busy with work the past few weeks so i haven't had a chance to get much done on the machine until today. I had my buddy from volvo come take a look at it we got most of the electrical gremlins sorted out. Now everything electrical works with the exception of the water/temp guage. He feels that there is a good possibility the machine is airbound due to being run with next to no fluid. Or the pilot pumo is junk as others have suggested. He thinks this because when checking for pilot pressures he cracked one if the lines loose on the block for travel while having me put very light pressure on the pedal and a massive amount of air came out and then the track jerked forward under full power for about 3 seconds and stopped, which is the only track movement I've had with this machine since buying it. The machine barely has enough power to swing right but when swinging left moves better/faster, although still nowhere close to where it needs to be. Is there a procedure to bleed the hydro system? Should i consider cracking all the lines loose one by one and trying the individual functions to attempt a bleed? Could something else cause air to enter into the system when it shouldn't?
  2. uffex

    uffex Senior Member

    Jan 23, 2012
    Lincoln UK
    Good day
    Please see attached maybe helpful.
    Kind regards

    Attached Files: