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Subject: fordson major transmission fluid

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paul appleton    Posted 08-18-2019 at 13:47:40 [URL] [DELETE]        [Reply] [Email]  
  • fordson major transmission fluid
  • I have a friend who owns a blue Fordson major, about a 1950 or so, manufactured in England. It is a diesel with a 3-speed transmission plus splitter. This may be considered a 6-speed forward with 2 reverse. When he first got the machine the hydraulics were working well. After a while, he started to lose lift power. He noticed the fluid was milky so he changed it with hydraulic fluid. Now it won't lift any weight at all. The three-point does, however, work without weight. Does anyone know if he is using the correct wt oil or should this be something like a 90 wt.

    TheOldHokie    Posted 08-18-2019 at 14:43:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: fordson major transmission fluid
  • The Fordson Major was a common sump machine just like the N's and the oil should be a mild EP gear oil - not conventional hydraulic oil. The Ford recommendation for those machines was the same as the 8N:

    M-4864A - mild EP SAE 80 (winter)
    M-4864B - mild EP SAE 90 (summer)

    Either one of those grades would lift a full load in either season and a modern all season equivalent is Universal Tractor Transmission Fluid (UTTF). Ordinary hydraulic oil is not suitable for use in the transmission and final drive so it should never be used. But if an ordinary hydraulic oil was used it would have to be an extremely light grade to have any chance of causing this problem and that would only be at elevated operating temperature. It would still lift fine at cold startup. That of course presumes the pump and lift components are not worn to He!! and back.

    TOH

    Paul Appleton    Posted 08-18-2019 at 15:18:08 [URL] [DELETE]        [Reply] [Email]  
  • Re: fordson major transmission fluid
  • Thanks a bunch, Hokie. I'll pass the info on.

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