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Your hydraulic connections are likely to be unique to your tractor, and Hugh's advice is the best you're likely to get - you'll just have to trace things out and figure out how they work. A couple of things to look for in the process: are the cylinders single-acting (one hose connection/cylinder, probably for movement in the up direction only (one hose per cylindeer unless something really strange is going on) .. or are they double-acting, hydraulic pressure applied in both directions (two hoses/cylinder). The standard 300U control valves have a switch to change from being set up for double-acting versus single-acting - look at the front of the valve and you should see an upside-down "S" and "D" and a toothpick-sized pointer indicating which one is selected for that particular valve. You're probably just going to have to experiment and use some common sense to get it to work correctly. The bare weight of the 300U is about 4150#, to which you add gas, the various oils, and coolant (maybe 250#?). If the tires are filled with CaCl2, add about another 930# for 13.6-28 tires. Add 145#/side for any sets of rear wheel weights. Your guess is as good as mine for the loader and blade, but you're probably talking about at least 200# or so for the blade, and perhaps 1000# or more for the loader, depending on which ones you have. Add it all up and it gets pretty heavy. Probably the best advice at this point is to get yourself a set of manuals from Binder Books - in particular the Operators Manual. Good luck with your "new" tractor.
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