I was sort of having the start of the same trouble on my 544,, I had it lent out pulling a hay rake for a while, they kept checking teh fluid and it was full, when they brought it back they told me what it was doing and I felt it hard to turna nd squeeling,, I thought great ,, I checked the fluid with the engine off, it was full, [this is a hydro],, looked at the book and it says check it with it running, , it was a little over 3 "gallons" low,,, I think I caught it prior to doing a lot of damage I hope, time will tell,,,
I looked at the book trying to figure out what I was going to need to replace or repair,, I came to the conclusion it would be the flow divider valve /control-pilot- valve valve,,, on my tractor the book shows it to be [and I found the valve unit] on the left side of the tractor in front of your feet, follow your lines, you wil see the unit,
the book shows a test try to turn your wheels with teh engine off,,,if the steering can be accomplished in both directions control valve is working,, NO steering can be accomplished if the control valve is stuck on center,a control valve stuck off center will allow steering in one direction only..the relief valve is in this unit,,
hope that helps, I dont know if I can scan the page and post it the same as a picture,, good luck,
I know it also shows that you can put a gauge on the outlet and test pressure ,,
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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