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SAE 30 Non-detergent oil is the original recommendation, and it works fine. Hy-tran will work very well and is recommended if you swap implements with another, newer, tractor. If the pump is beginning to wear, the SAE 30 may give a little better pressure when the system is hot. There are three outlet ports, and they are ALL pressure. The right side port, and the front port on the left are the same circuit. If you mount a front loader, or cultivators, use those. If your 3pt hitch has two cylinders, you could use those ports. There is a second port on the LEFT side of the tractor. This was for the rear gangs of the cultivators, and in most instances is "timed" to lift the rear cultivators after the front ones at nearly the same place in 3rd or 4th gear. The operator simply pulled the control rod and held it until both sets lifted. Pushing the control rod forward through the first detent releases the pressure on the front ports; pushing the rod ALL the way down releases the rear port. We used to use this setup to lift the harrow on the front of a corn planter with one of the front ports and the planter itself with the rear port. Your H has "single" acting hydraulics unless someone has added some other features. The cylinder is used to lift the implement, and gravity brings it back down. Oil flows to the cylinder under pressure when the control rod is pulled, then flows BACK through the SAME line when the presure is released. A special valve can be installed that lets the tractor provide 2-way use of a cylinder, but that uses some extra plumbing and a return line to the fill-port on the top of the pump. If the cylinder on the 3pt hitch has TWO hoses on it, it's a double-acting cylinder. In that case, remove the hose that would normally retract the cylinder and replace it with a "breather" that keeps out dust but allows air to enter that end. If the 3pt hitch has only one cylinder, it's likely on the left side. If that's the case, I'd leave the front ports plugged and use the left rear port. When the front ones are plugged, there is no "delay" in lifting with the rear port. I have an M with a loader hooked to the front ports and a 3pt on the rear. This required installing ball-type shutoff valves in the lines at the ports. By putting the loader at convenient height, I can then shut off those lines and lock the loader in place to use the 3pt. Locking out the 3pt hitch allows me to use the loader. The pressure output of an H can vary widely. If it's an early model, it may be only 450 psi or so. If the pump is worn, it may be less. A later model H or one with an up-graded pump may be around 800 psi or so. Sometimes people have fiddled with the pressure relief and pushed them to around 1000 psi. Don't use old, cracked, frayed, rotted hoses when you hook this thing up. Hot oil under pressure is nasty stuff. If your system is in good shape, you may find the front of the H is very light or will actually leave the ground when you try to lift something heavy with the 3pt. That hitch will increase the versatility of your tractor. Enjoy it!
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