The case is rigid and compact, with four forward gears. The design eliminates the clutch and torque converter, which are high-priced components with high failure rates. The harvester uses a continuously variable transmission, cross-axis differential, and a reliable and durable clutch structure. It provides smooth transmission, low noise, strong bearing capacity, reliable connection, and easy installation. The continuously variable transmission structure, thickened output shaft, and helical gears are used. The strengthened shell increases the strength and reliability of the machine.