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JD70D-Power Steering Adjustments

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Blksmok

03-11-2003 19:42:58




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When I motor the diesel engine @ 200 rpm (15 degree temp.) with the pony engine the steering wheel automatically turns counter clockwise, turning the front wheels to the left. When it warms up it doesn't do it, but then it "catches" after you've turned to the left and try to correct the steering back to center. Tractor turns w/o problems to the right. Do I need to tap the p/s valve assembly toward the rear of the tractor to correct this behavior? Is the "catching" indicating I need to shim the p/s valve away from the worm gear body? Looking for suggestions. Thanks!

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Clooney

03-12-2003 06:13:42




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 Re: JD70D-Power Steering Adjustments in reply to Blksmok, 03-11-2003 19:42:58  
Blksmok, I have seen other tractors do what yours does. [usually high hour tractors with steering wear]�Usually the cause is worn steering actuating sleeve parts, or pins, or a mis-adjusted flow control problem. With that steering catching when warm it sounds like you have worn actuating sleeve pins or loose helix screw [old style system] or the steering valve is loose in the bore. I�m guessing you will also find a slot worn in the cam slot & maybe the helix screw slot.
~What type of P/S oil are you using? If non Deere it could be way too thick when cold & be causing high pressure until warm. [excess pressure when cold can cause the flow control to not function]. ~A while back I did some oil testing to try to find a replacement for Deere P/S oil & found a few that could match the Deere oil�s performance in the warmer areas but anything that worked when warm was way too thick when below 20�F. ~About all you can do is warm the tractor steering system then adjust the centering force so the steering wheel takes the exact same force to turn in either direction from center, then adjust the flow control so you don�t have any catching, then live with the cold performance. Or take the steering system apart & replace any worn parts & anything that has wear that will catch a pin when turning, then give it a vane leakage test to make sure you don�t have a steering vane by-passing oil.
~You might want to make sure the steering shaft isn�t bent or binding & putting a side load on the actuating sleeve splines. If there is ANY tightness or binding in the steering shaft to actuating sleeve it can cause the actuating sleeve to move the steering valve fork & cause a dissimilar oil flow to the steering vanes. You might need to center the bolster so the steering shaft & actuating sleeve aren�t binding when cold. [long shot but I have seen that as a problem].

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Blksmok

03-12-2003 09:08:02




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 Re: Re: JD70D-Power Steering Adjustments in reply to Clooney, 03-12-2003 06:13:42  
Clooney.....is the "catching" caused by too much flow or not enough? Should the slotted adjustment screw be turned in or out? Thanks!



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Clooney

03-12-2003 09:39:01




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 Re: Re: Re: JD70D-Power Steering Adjustments in reply to Blksmok, 03-12-2003 09:08:02  
Blksmok, the catching is not actually caused by the flow. It is caused by something in the actuating sleeve hanging up when the wheel is turned. Increasing the system flow allows the front wheels to turn easier, so the load is much lower on the cam & spring so you actually move the front wheels before whatever is catching hangs the steering up. I think you will find the problem gets worse with the tractor sitting still or with the front wheels on a high traction surface.
~Increasing the flow with the flow control will sometimes cover up a sticking steering problem.
~The slotted adjustment [helix] screw has to be adjusted for as little end play on the actuating sleeve as possible but still have a slight amount of end play in the actuating sleeve. On a worm system that is always IN [the question is how much more IN]. The other problem you will find is when that helix screw is about correct on center it will bind when turned off center on a worn system. Play with it until you can get it about as tight as possible & still work without sticking�.

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