Discussion
A quick Google came up with this if it helps...
•American tanks used a hydraulic system, but drove it electrically. Instead of a PTO from the main power plant, like a tractor, the hydraulic system was energized by a pump driven by an electrical motor. Also, only the Americans applied stabilization gyroscopes to tank main armament, beginning with the M4 Sherman (on the early Sherman, in elevation only). This gave the tank a rudimentary shoot-on-the-move capability, and perhaps more usefully in tank fighting, reduced the amount of displacement needed to get on target after moving. When hydraulic system production threatened to constrain tank production, some American tanks were fitted with an electrical system also. The electrical substitute system was designed to have similar performance. American tanks used hand controls to slew the turret, and a foot pedal to fire the armament.
•American tanks used a hydraulic system, but drove it electrically. Instead of a PTO from the main power plant, like a tractor, the hydraulic system was energized by a pump driven by an electrical motor. Also, only the Americans applied stabilization gyroscopes to tank main armament, beginning with the M4 Sherman (on the early Sherman, in elevation only). This gave the tank a rudimentary shoot-on-the-move capability, and perhaps more usefully in tank fighting, reduced the amount of displacement needed to get on target after moving. When hydraulic system production threatened to constrain tank production, some American tanks were fitted with an electrical system also. The electrical substitute system was designed to have similar performance. American tanks used hand controls to slew the turret, and a foot pedal to fire the armament.
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