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hydrastatic tranny


Adam

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technically inclined please explain how a hydrastatic transmission works, i have ran a couple pieces of equipement with it, and soon i am going to be running a forwarder for my dad in the woods with one and just wanting to know a little more about it
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Most from what I understand work similar to a torque convertor with a variable pitch stator.

The pitch degree regulates the output speed or the tranny.

 

Operation is simple though. You will set the engine RPM at a certain level and leave it. Then the speed control is done by the hydrostat drive

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I work at an equipment rental place, and I belive those type of hystat trannys are just driven by a hydrolic pump, along with everything else. How the inner components work....couldn't tell ya. But I do believe the the speed is adjusted by valves. could be wrong though.
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The speed of the motor is varied by the displacement of the pump or motor. The more fluid that is displaced the faster the motor will turn. When you push a lever or something forward you are probably changing the pitch of a valve plate that changes the stroke of the pistons in the motor. It is kinda hard to understand unless you can see a picture of it or a book. It all has to do with the displacement of *** fluid either from the pump or motor.
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