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I'm going to disagree with jmyt_47@MN and say that you're almost certainly OK with what you have for what I think you're trying to do. However, if you're also trying to add the power steering, you'll need the regulating block of the tractor you're robbing for parts to make it work, as he indicated. Starting with what you have on your non-power-steering tractor, you can do one of two things to add the loader, without the power steering: 1) Make sure all three openings on the side of the reservoir at the mounting for the new valves at the front of the reservoir are open, and just mount the valves with the required O-rings. Make sure the hole where the external tubing connected to the cover (if you're using the one that came with the loader) is plugged. Hook up your hoses and away you go. 2) Or you can also hook up the external tubing connection between the two banks of valves, but you don't need the tubing connection going from the rear (hitch) control valve to the regulating/safety block (this in ONLY needed if you're actually using the original power steering setup, and there shouldn't be any port for it in the regulating block on your tractor, anyway). The external tubing is for the high pressure fluid, and parallels a channel inside the reservoir. The power steering option on the 300U was really a kludge to enable grafting the closed-center hydraulics of the power steering onto the basic hyraulics. The latter used a third port to the control valves to sense whether the control valve was open or not; a loss of pressure on this line when the valve was opened causes the hydraulic pump to be loaded up, otherwise it just idles. In a system with power steering, hydraulic supply to it took priority; if any capacity was left it was supplied to the control valves via the outlet port and external tubing from the regulating block. The internal passages in the reservoir are blocked off when using the power steering option. Hope this helps rather than confuses. If you have the parts manual (TC-57A), this is all shown on page 370. Email me if you need (and can tolerate) any more input.
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