I ran Western plows back in that era. You will probably find your turn cylinders are pitted from rust. Those pits are little cavities that bring ice, sand, grit, and water into the system each time you activate the blade turn. But the reservoir is large and tolerates a lot of this junk, usually it settles to the bottom. IIRC, the preferred hydraulic oil for this system is ATF (cheap compared to oil required by other brands of plows). So first off, I'd drain and clean the reservoir, and then look at the cable that connects to the drop "arm" behind the rectangular plate. The cables were a frequent problem for us. It may be stretched, rusted tight, or bent from being too tight. Usually the cable problem was at the pump, not at the T handle. This system does not use electronic solenoids to open or close the control valves, only 2 cables. One of the cables controls the turn cylinders, and the other activates the dump valve. Any time you pull or turn the T handle, the pump motor solenoid is powered and the pump runs. It is a simple system.
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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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