hydo problem

Discussion in 'Mechanic and Repair' started by DublinLadd, Jul 5, 2001.

  1. DublinLadd

    DublinLadd LawnSite Member
    Messages: 16

    I have a Woods 6200 ZTR. The left side hydrolics works fine when started then when it warms up I loose the reverse, forward still works fine. Is this due to ware? Do I have to puy a new hydro drive on it?
    Thanks in advance
    P,S There is 1345 hrs on the machine
  2. sdwally

    sdwally LawnSite Senior Member
    Messages: 386

    Sounds like a bad bypass valve in the hydrostat. Nothing major if it is that. When the oil cold it is thicker, less viscous, and is not leaking by the bypass as much. Once the oil is hot, it flows easier thru small gaps.
    If you still have normal motion in forward, it is not going to be a major rebuild or new pump. The bypass is located on the hydro pump, there should be two, one for forward and one for reverse. A repair manual would tell you exactly which one. Bypass valves should be anywhere from $20 to about $75, depending on pump size and manufacture.
    If you find broken parts/pieces in the bypass valve, try to account for all parts and/or pieces. Even a small piece of metal floating around in a hydro system can cost big $$$s.

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