A mid-mount lawn tractor comprising an engine, front and rear wheels, and a working implement or lawn mower mounted between the front and rear wheels. A transmission is disposed adjacent the rear wheels and includes an upwardly extending input section. The transmission is housed in a transmission case defining an opening at an upper portion thereof for exposing the input section. A hydraulic stepless change speed apparatus is disposed above the transmission. The change speed apparatus includes a downwardly extending input shaft for receiving power of the engine through an endless belt, and a downwardly extending output shaft connected through the opening of the transmission case to the input section of the transmission.
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