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Subject: 641 Hydraulics question

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Tom Hall    Posted 09-06-2017 at 16:34:28 [URL] [DELETE]        [Reply] [Email]  
  • 641 Hydraulics question
  • Six or seven weeks ago I asked for thoughts on adding a control valve to a 641, UD and TOH both responded and I now have a Ford single spool valve. Now my problem, valve is in great shape and I added new O rings but have a constant leak at front right corner. I've removed the control three times, inspected the surfaces installed new O rings and reinstalled but still the leak. Could it be maybe thicker O rings in the two openings just behind the bolt on that side ? Am I missing something obvious? I also added a set screw to seal the 5/16" bolt hole in the center from the block off plate.
    Any ideas to get the 641 usable would be appreciated

    Tom from Mi.

    Tom Hall    Posted 09-17-2017 at 08:22:10 [URL] [DELETE]        [Reply] [Email]  
  • Re: 641 Hydraulics question
  • Thanks for the reply, no metal gasket that I'm aware of. I've compared the two bases of block off plate and valve and with the exception of the 5/16" bolt hole in the block off plate they appear identical. I replaced the block off plate and no leak! even with the old O rings the block off plate seals so now I'm stumped.
    Any suggestions are welcome


    Larry Holbrook    Posted 09-07-2017 at 08:44:03 [URL] [DELETE]        [Reply] [Email]  
  • Re: 641 Hydraulics question
  • Is this a single control for a hydraulic cylinder under the seat? If it is let me know when you find a solution. My Ford 3000 has a small leak there. My brother and I were talking about this leak and he said the 1963 Ford 4000 we had on the farm as kids leaked there also. I believe that they are prone to leak. Mine is very small but irritating.

    LeRoy    Posted 09-09-2017 at 10:24:19 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 641 Hydraulics question
  • Was there a metal gasket plate under the cover?

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