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520 power steering pump

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russ lante

09-08-2001 19:32:10




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I am having some problems with the power steering on my 1958 JD 520 tricycle...when turning the wheel to the left more than 45 degrees it sticks there and only releases if you turn it further to the left. this is causing several of my smaller trees in my pastures to mysteriously disappear when i try to bushog near them. I asked the local JD service shop to fix it but they were unsuccessful.
I have read that it may be the gear at the end of the steering column,but i still feel like it is a problem in the pump itself. Any hints on how to solve it or where to find more info ? thanks ...russ lante

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KWB

09-09-2001 06:49:38




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 Re: 520 power steering pump in reply to russ lante, 09-08-2001 19:32:10  
Another cause of binding in these systems is if the clearance between the steering worm and steering cam is adjusted too tight. It would probably be a good idea to check the pump pressure, but I havn't seen low pressure cause binding myself, just hard steering. Unfortunately, there are not many people at John Deere shops left that know how to work on these systems. I would recommend getting the service manual from John Deere.

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Chuck

09-08-2001 19:42:13




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 Re: 520 power steering pump in reply to russ lante, 09-08-2001 19:32:10  
the problem isn't your pump. You have wear on the large gear and it is binding. You can rotate the gear 180 degrees and check the shims and this should solve the problem. Also I would recommend a rebuild of the pedistal vanes and o rings. All this is little hard to explain but if you can find a veteran restorer near you I'm sure you can work it out.



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