
Thanks to all you for your posts. I have "taken over maintenance" of a 1986 Ford 1910 that sleeps under a hackberry tree when it is not being used. I just bought a new Modern 5' mower to replace a worn out Howse, and the lift was not doing a good job lifting it. After reading this, I decided the seal in the lift cylinder might be the culprit.
First, I drained all of the hydraulic fluid I could get. The old fluid looked like chocolate milk! While it was empty, I took the head off -- not a problem because the weight of the lift arms wanted to push the rod all the way through -- much easier after I supported them!
Imagine my surprise to find that the seal was completely gone! No telling where it is.
The new seal kit they sold me is different from the pictures -- they said this was a new design. It has a black "rubber" O-ring and a white "nylon" ring that is split. They said the O-ring went to the "oil side" of the piston, and the white ring was used to fill the gaps.
Took some "encouragment" to get the piston back in the cylinder, but it finally went in. Reassembled everything, filled the transmission with new hydraulic fluid, replaced the filter, and tried it out. Now the 3 point hitch is rock solid again, and the "position control" lever can now be used to, well, control position!
I briefly thought about buying a new tractor with about the same horsepower, but I think this one still has a lot of life left in it after I finish my rehab. As time (and funding) permits, we plan to build a garage and it will get to sleep inside -- should make a lot of difference.
Once again, thanks for the pictures, the advice, and for posting notes about the journey. Not only did I save a lot of money fixing this myself, but I learned a lot more about how the hydraulics work on this machine!