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Johndeere 3020 rock shaft housing

Discussion in 'Repair & Technical Discussion' started by farmboy196, Feb 12, 2018 at 10:39 PM.

  1. farmboy196

    farmboy196 New Member

    3
    Apr 24, 2012
    I replaced the rock shaft cable and I moved the leaver that the cable hooks to I have found out that I shouldn't have done that now the arms will not go up . Does anyone know how to fix this problem? This is on the right side of the tractor thanks for your time
     

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  2. RC Wells

    RC Wells Active Member

    821
    Dec 25, 2008
    Common issue when replacing the cable. The old cable had stretched and adjustments were made over time. The new cable is now too short and the operating hinge screws (1 and 2) need to be adjusted according to the instructions in section 127 on page 83 of your manual.

    It is also possible the relief valve released, it must be manually reset 99% of the time that happens.

    Under the right side of the seat, under the cover, there is a plug at the top rear of the hydraulic body. It looks like a bolt, there is a spring under that plug that holds the relief valve closed. If during testing or if the cable failed, and the rock shaft exceeded its range of movement that valve will open, it also will release under loads that exceed the system rating.

    Remove the plug, pull the spring and valve out, clean them and reinstall. The lift will have hydraulic pressure once again. However, the operating hinge adjustment screws must be properly adjusted, or the valve will pop again when the system exceeds its normal range of rotation and binds.
     

  3. RC Wells

    RC Wells Active Member

    821
    Dec 25, 2008
    Read this entire post before attempting to adjust the draft control!

    There is a third scenario, look where your Load/Draft lever is set. Try it in D and see if it will raise all the way up. If not then adjust the cable length as described in the manual.

    If it raises all the way up set the L&D lever in the middle slot. After completely lowering the arms set the front or leading edge of the dash or console lever on 1.

    If you go past 1 drop it down and start over.

    Remove the bung hole plug at the rear of the seat. Tape or better yet, weld a 9/16" socket to a rod or extension bar about 18" long. Inside the bung hole is a nut that you unlock by putting the socket on it and pushing the nut back.

    Its a castle nut locked in place by a roll pin. With the engine idling and the 3 pt arms down slowly turn the nut counterclockwise until the arms just begin to raise. Remove the socket and rod/extension bar and push the raise/ lower lever all the way forward if an older tractor or rearward if a console model.

    Let it stabilize for a moment or two then very slowly move the lever in the opposite direction until the arms just begin to drop. The leading edge of the lever should be on 4 at that point if in proper adjustment adjustment.

    If the difference is closer to 1 or 4 readjust and split the difference on the adjustment.

    Be extra cautious when adjusting the nut that you stay out of the way of the arms.

    RED FLAG. IF you lose the socket in the rear end, it is catastrophic. It requires major disassembly to retrieve, and it must be retrieved.

    I recommend a trip to the dealer service department, or to a skilled and experienced tractor mechanic for most owners of this series of JD if the draft control requires adjustment. It can literally save a thousand dollars or more should a socket be dropped in the rear housing and operation attempted.
     
    crawdaddy likes this.
  4. farmboy196

    farmboy196 New Member

    3
    Apr 24, 2012
    Awesome thank you for your experience and Time