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Bobcat 843 Hydraulic Controls Malfunction

Discussion in 'Skid Steers' started by smitty66212, Jan 23, 2017.

  1. smitty66212

    smitty66212 New Member

    Joined:
    Jan 23, 2017
    Messages:
    1
    Location:
    Kansas City
    Hello, brand new to the forum and just bought my first skid steer ever, Bobcat 843. I bought it with hydraulic issues, but not really sure what I was getting into.

    The left foot (lift) is not working at all, doesn't cause lifting arms to move. The right foot (tilt) will work the cylinder when there isn't a bucket on it, if bucket on it, it will not lift the machine off ground when you tilt down. When you curl the tilt to the fullest, then the loader arms will lift up, when nothing is touching left foot peddle. Also, when you pull the right steering lever in towards your thigh (auxiliary function), the loader arms will lift up and no foot peddles are being pressed.

    Where do I start to diagnose this, could this be the control valve spools leaking across circuits, or could this be a relief valve issue?

    Appreciate any help, I am determined to fix this myself even if it takes me a few months. I want to learn about these machines.
     
  2. franklinute

    franklinute Well-Known Member

    Joined:
    Dec 1, 2010
    Messages:
    94
    Location:
    Winchester, TN
    I would start by checking that the seat bar is all the way down and that it engaging
    the release arms that allow the foot controls to work. The auxiliary hyd lever will operate
    toward you thigh but will also operate away from your thigh and can lock in. Be sure that
    is in the middle. Raise the cab and be sure the linkage is in good order and that the poly
    bushings are in good shape. If all that is good then I would proceed to the control valve.
     
  3. crewchief888

    crewchief888 Senior Member

    Joined:
    Feb 2, 2012
    Messages:
    1,664
    Location:
    NWI
    yea check the aux handle 1st...


    :drinkup
     
  4. Vetech63

    Vetech63 Senior Member

    Joined:
    Aug 10, 2016
    Messages:
    3,591
    Location:
    Oklahoma
    You have at least one bad cylinder piston packing. The control valve is an open centered closed port design. When you mash the pedal for one control, the oil getting past the bad packing is feeding the other circuit. Not sure on the steering as that is operated by piston pumps driven off the back of the engine, and the small gear pump on the back of those is the implement pump. I would bet you have cylinder packing material in some of the load checks, reliefs in the hydraulic system.