4020 power steering
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Thread: 4020 power steering

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    4020 power steering

    The steering cycles left and right when driving down the road. Is there air in the system and how do you bleed it.
    Thanks, Nella
    JD4044M and 1010 like this.

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    There could be some slack in the steering box and the tie rod ends causing this. The back and forth could also be over driving the tractor. It takes a steady hand and very little steering on the HWY.

    Without seeing it first hand it's hard to tell if you have a problem or it's the above. It's very easy to overdrive a 4020 on the road.
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    Quote Originally Posted by 1010 View Post
    There could be some slack in the steering box and the tie rod ends causing this. The back and forth could also be over driving the tractor. It takes a steady hand and very little steering on the HWY.

    Without seeing it first hand it's hard to tell if you have a problem or it's the above. It's very easy to overdrive a 4020 on the road.


    It occasinaly cycles to the left about 1/4 turn without moving the steering wheel and needs to be corrected. So I think that I am not oversteering.
    1010 likes this.

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    There's a bleeder screw on steering valve under steering wheel but it will surprise me if air in system is the problem. I suspect that an o-ring is leaking on piston in steering motor. O-ring can be R&R by securely supporting frt of tractor then dropping frt axle & removing one side frame to expose the plug that holds pistons in motor. One also needs to drop spindle out of motor to remove pistons. Spindle requires timing when re-installed. Parts required are listed below.
    1 ea R34748 Seal - SEAL,OIL ADD 34.22 USD

    2ea R26290 Back-Up Ring - RING,BACK-UP ADD 6.47 USD 12.94 USD

    4ea R47083 Back-Up Ring - RING,BACK-UP ADD 4.86 USD 19.44 USD

    2ea R26282 O-Ring - PACKING O RING ADD 3.69 USD 7.38 USD

    4ea B3685R O-Ring - PACKING,O RING ADD 4.46 USD 17.84 USD
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    Last edited by Tx Jim; 07-01-2018 at 07:08 AM.

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    The steering motor orings are most likely problem as TxJim says, but also could be a problem in the steering valve. Bad orings or valves not seating properly can cause the same symptoms.
    DRobinson likes this.

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