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Case 721, 1990 mod. overheating hydraulics

Discussion in 'Heavy Equipment' started by loaderfeller, Aug 6, 2013.

  1. loaderfeller

    loaderfeller Junior Member
    from Norway
    Messages: 1


    I have a Case 721 (1990s), and its hydraulics system overheats after 2-3 hours of use. I have changed both hydraulics filters, to no avail.

    I know this might be a long shot, but perhaps any of you have experience with this machine, or perhaps you know someone that does?

    Cheers guys!
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,392

    Just gunna ax. How do you know the hydro is overheating?
  3. DellDoug

    DellDoug Senior Member
    Messages: 425

    Check the o-ring on the relief valve and its overall condition. Heat and presure go together....if the relief valve is sticking it will cause the hyd's run hot and a little bit slow.