Main bearing jurnal on crankshaft is bad. Same problem as you have but it was a Ferguson TO30. Bought with good oil pressure when looked at and bought but when warmed up working no pressure. It was only one spot on crankshaft and as being a main no noise like a rod would have. Ended up thecrank was ground, only supposed to go to 3000 under but to get it to work had to do 4000 and it was good for several years before I traded it off. Been too many years to remember for sure but only part of the jurnal was worne away, and a rib of correct size still on the shaft. I am thinking the rib was on center of bearing with both sides gone. So part was still tight and could not be detected even with pan off, had to take the bearing caps off and problem was as plain as day or night. I had bought it at a dealer but a different shop did the work, close and Dad went to school with the owner of the shop that was the Ferguson dealer. The Dealer I bought the tractor was a Ford tractor dealer quit a bit away but they did have the crank turned. This was in the mid 60's.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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