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Tractor Talk Discussion Forum

Power Steering

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Ted A

10-02-2004 20:16:22




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I have an old back hoe with orbital valve steering. Does anyone have any ideas as to why it would steer very slowly. If the wheel is turned too fast it just stops actuating the steering cylinder. If it is turned slowly the clylinder responds nicely with the power needed to steer. Thanks




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Roland Jackson

10-03-2004 05:54:21




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 Re: Power Steering in reply to Ted A, 10-02-2004 20:16:22  
Ted, I agree with Jon...there is a restriction of flow to your steering control unit....or if it has a steering pump, the pump is not pumping enough fluid. Sometimes a pressure hose can come loose inside and wad up...restricting the flow. That has happened to me twice...and was real hard to find the first time. Check the return line from the steering control unit. It could be restricted as well and would have the same effect on your power steering. If you have any questions, just give me a call 620-357-6546. Be glad to help you in any way I can.

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Jon H

10-02-2004 22:30:10




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 Re: Power Steering in reply to Ted A, 10-02-2004 20:16:22  
Most tractors that use one hydraulic pump for all systems have a priority flow divider so the steering gets oil before anything else. It sounds like the orfice in the priority valve is restricted by somthing that has got into it. Check that the orfice in the valve spool is open and that the spool is not stuck. I had the exact thing happen to me this spring on a Hough 30 payloader. A bit of plastic trash had gotten into the valve orfice and caused very slow or no power steering.

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