I agree mkirsch, any universial tractor fluid that "meets or exceeds" OEM specs will work in a +40 year old tractor as well as most modern equipment. My 504 has had generic fluid in it since 1962 or the first time the fluid was changed. If it doesen't "meet or exceed" OEM standards, then the company will be sued and loose their tail. The same refinery that makes Hy-Tran probably makes Delta Pride.
The purists that harp on Hy-Tran probably use Super Tech in their engines. I use Mobile 1 in all my automobile engines as well as synthetic transmission, differentials and transfer case oils. But when it comes to a 50 year old tractor, I feel that a generic tractor fluid is above what was available when it was engineered and manufactured. I do use branded 15W-40 in the engine, but I buy the brand on sale.
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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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