A transmission or gearbox is the gear and/or hydraulic system that transmits mechanical power from a prime mover (which can be an engine or electric motor), to some form of useful output device. Transmission is a speed reducing mechanism, equipped with several gears. The simplest transmissions, often called gearboxes, provide gear reduction sometimes in conjunction with a right-angle change in direction of the shaft. It may be called a sequence of gears and shafts, through, which the engine power is transmitted to the tractor wheels. These are often used on PTO-powered agricultural equipments The complete path of power from the engine to the wheels is called power train.
Function of transmission system:
The power transmission system consists of:
(b) Transmission gears
(d) Final drive
(e) Rear axle
(f) Rear wheels