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Hello there. 1. The shaking lift comes from stuck valves on probably more than one of the 4 pistons in the hydraulic pump. Since you say it shakes a lot, I will assume only 1, or maximum 2 pistons is actually pumping. So, out with the pump, and free the valves, or get a valve repair kit or at least gasket kit. The cause for this problem is most likely old oil with water in, so there is some rust and greasy oil. 2. To operate your hydraulics properly you need a proper operators manual. They are easily found. But, just to help you a little out, for raising and lowering a non-earth digging implement, like a rake or a shovel, put the shortest lever, the one closest to the rear wheel all the way down, and then you use the lever closest to the seat, the one with a ball on top. Down and the implement should lower, and up and the implement should raise. If you try an earth digging implement you can use the same setup to just find out if the implement will dig itself down into the soil when you drive forward. There is as the others mention no pushing down in the hydraulics. Just the weight of the implement and the forward motion will dig the implement down into the soil. 3. Oil to use. You must never use a plain hydraulic oil for this tractor. There is only one oil in the transmission and centerhousing. This means the same oil is used for differential, hydraulics and all other gears.
There is tractor oils for this, made for this kind of purpose. Or, you can find a GL 1 gear oil, SAE 80 or 90. Or, you can use plain multigrade engine oil, SAE 15W-40 or similar. Works fine.
What you have to count for is that sooner or later the oil gets dirty and suck water.
And you will need to replace it.
I hope this helps.
Bill
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