It's a combination of electric and hydraulic. A unit sits behind the blade on the bracket. A 12 volt motor about the size of a starter motor drives a built-in hydraulic pump. There are hydraulic cylinders that lift the blade and angle it. A T handle "joy stick" in the cab controls the lift and the blade angle through armored cables similar to shift and throttle controls on a boat.
A micro switch in the controller applies power to the unit and runs the motor only when hydraulic pressure is called for.
Make sense? I once had a unit that was pure hydraulic and used a Chrysler power steering pump for a hydraulic pump. Which required a bracket for the pump and another belt off the crank pulley to run it.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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