The JCB JS140 uses a hydrostatic transmission system, which means that it uses hydraulic fluid to transmit power from the engine to the tracks. The transmission consists of a variable displacement hydraulic pump that provides oil flow to the hydraulic motors, which in turn drive the tracks. This system offers infinite speed control and allows the machine to have a high level of maneuverability.
The JCB JS140 also has an electronic control system that regulates the hydraulic flow and ensures optimal performance while minimizing fuel consumption. The transmission also includes a torque converter, which helps to increase torque and improve the machine's efficiency when operating in heavy-duty applications.
Overall, the JCB JS140 is a powerful and efficient excavator with a reliable hydrostatic transmission system that offers excellent performance and maneuverability in a variety of working conditions.