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Hydro problems, drive motor "slipping"

Discussion in 'Mechanic and Repair' started by mark2, Dec 17, 2002.

  1. mark2

    mark2 LawnSite Member
    Messages: 93

    I run a Deere z for a customer and it has started making a noise in the left hand drive motor. It seems like it "slips" when you put it under a load. I have changed oil and filter and it still does it. The machine has about 550 hours on it. I first noticed it after grinding up leaves. I ran it in reverse more than usuall.
  2. sdwally

    sdwally LawnSite Senior Member
    Messages: 386

    Depending on the noise, it might be the high pressure by-pass valve in the pump. The valve will by-pass if the pressure gets to high to prevent other damage to system. If it is adjustable, it may have backed off and by-passes at to low of a pressure. We recently had a unit with a high pressure by-pass valve failure and it split the case on a gear drive style pump.
  3. Bunton Guy

    Bunton Guy LawnSite Bronze Member
    Messages: 1,916

    This might be nothing but dont all valves have a way of shutting off ? Like when you have to push or pull a hydro mower a release valve...well one time I had to tow the mower out of some mud and when I turned the valve back on I didnt turn the valve all the way and it was acting up it wouldnt go up a hill or track straight.

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