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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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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.
 

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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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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.
 
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