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releasing hydro pumps?

Discussion in 'Mechanic and Repair' started by mowisme, Mar 24, 2008.

  1. mowisme

    mowisme LawnSite Senior Member
    Posts: 898

    when going to move or pull a ztr- how do you 'release' the pumps?? just take belt off? thanks- Geno
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    There is a dump (release) valve on most hydro pumps that will release pressure for moving a non-running unit. Without any numbers or pump brand posted it could be anywhere on the pump.
  3. JimQ

    JimQ LawnSite Bronze Member
    Posts: 1,139

    Look on the side of the pump. There is generally a bypass valve. Just use a wrench and open it up a few turns.

  4. mowisme

    mowisme LawnSite Senior Member
    Posts: 898

    thanks- learning as I go with these hydro things. Geno
  5. mikegbuff

    mikegbuff LawnSite Member
    Posts: 81

    What is required once the mower is fixed and ready to be ran again? Do you have to do anything after you tighten up the release valve, or is it good to go then? I'm wandering if you have to purge air or anything.
  6. JimQ

    JimQ LawnSite Bronze Member
    Posts: 1,139

    As long as you haven't opened the hydraulic system, just close the bypass valves and you're ready to go.

  7. Lbilawncare

    Lbilawncare LawnSite Bronze Member
    Posts: 1,116

    Most dump valves are 5/8 with a hole through the nut, this is the best way to describe without pics. Do not remove them all the way, just loose enough to get the machine to roll, after moving always tighten the dump valve.

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