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Bobcat 720

Discussion in 'Mechanic and Repair' started by geckos, Mar 28, 2008.

  1. geckos

    geckos LawnSite Member
    Messages: 22

    Hello guys I have an old 1978 Bobcat 720. Heres the problem the right side does not move and the right side hydrolic motor is leaking oil out or the weep hole while the unit is in nuetral. when I try to make it go on the right side it shoots the fluid out of the weep hole. I have removed the hydo motor and it is in good working order. I have rebuilt the Hydrostatic pumps and checked the High pressure relief valves and they seem to be in good working order. I will be changing the 2 filters and I am looking for any ideas about what could be causing the fluid to leak out. it seams like a valve is stuck open but I cant find one that is bad.

    Please help out if you have any experience with this machine
  2. geckos

    geckos LawnSite Member
    Messages: 22

    OK so I changed filters and got my manual in the mail and found that the fluid coming out the weep hole is called case drain and is normal so the wheel still would not turn on the right side and I found that the parking brakes were improperly adjusted and were catching the wheels and not letting them turn so I have fixed that and now the machine will drive about 10 feet and then quit moving and the hydro Pressure light comes on when I try to move it. When I put it back in neutral the light goes back off so I am going to change the by-pass valve and see if it fixes the problem.
    Thanks to all for reading and Please if you have any thoughts please respond all help would be appreciated.
    will keep updating as I try more things
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Were the filters you put on OEM's ?

    I have found a couple aftermarket filters that state will fit X model and have a anti-drain back valve in them that can stop or restrict fluid flow.
  4. geckos

    geckos LawnSite Member
    Messages: 22

    Yes they were from bobcat and the same numbers listed in my service manual from 1982 but great idea to check thanks

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