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Show Parts for Model:

520 Power Steering Pump

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Gary Puckett

09-24-2012 18:58:44

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Using the great information from this site, I re-built my 520 power steering pump. I used a brand new fan shaft, installed new bushings, new seals, two on each end "back to back". The pump works great, but still leaks on the front end, fan side. I am using the John Deere power steering fluid for tractors built before 1960. I was clean and careful with the seals. What would you try next? I cannot stand a leak.

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09-25-2012 06:25:14

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 Re: 520 Power Steering Pump in reply to Gary Puckett, 09-24-2012 18:58:44  
If by chance you put them too deep and closed off the drain hole .

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Mike M

09-25-2012 06:14:14

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 Re: 520 Power Steering Pump in reply to Gary Puckett, 09-24-2012 18:58:44  
I use my press and try to carefully push the seals into place. Seals today are so flimsy they can can distort easy and this seems worse for me when I try and drive them into place. This may or may not be an issue here ? I also clean off the outsides of the seals and put a hardening type of sealer on them so as they don't get backed out with some back pressure. I also cover the splines with an old microfiche card to protect the seal lips as I slide it together.

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09-24-2012 20:08:26

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 Re: 520 Power Steering Pump in reply to Gary Puckett, 09-24-2012 18:58:44  
Do it again. Its easy to knock the spring off on the front seal during assembly. Just try it one more time

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