Power shuttle
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A power shuttle is an additional unit used in transmissions and is generally used in agricultural tractors.[1] While a vehicle is moving forwards, the driver can pull a lever that makes it stop and reverse at the same speed. Power shuttles are known under various trade names, such as Power Reverser.
In forward/reverse position of the F-R lever, pressure is built in the system due to flow to the wet clutch. During, the pressure rise, F-R clutch is energized, which makes the vehicle move. Flow to the tank line is blocked during the flow to the clutch.