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S. M. Henning
 
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(Roy) wrote:

For one reason a hydrostatic drive is much more smoother, and it does
adjust itself automatically according toload on a lot of models


That is called the governor and it is on the engine, not the
transmission. The governor keeps the speed of the engine constant. All
tractors have engines where the speed is controlled by a governor. The
throttle just adjusts the spring on the governor.

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