This general gearbox for agricultural machinery is especially suitable for agricultural machinery and equipment such as folding straw crusher machines, residual film recycling machines, and four-row seedling killing machine gearboxes. As a common agricultural work machine, the field returning machine is mainly used to chop crop straw, root stubble, and other residues into small pieces and spread them evenly on the ground surface for subsequent farming. A variety of speed-increasing transmission ratios are available: 1:1.57, 1:1.92, 1:2.16.Our gearbox can provide stable power output to ensure efficient and stable operation of the field return machine under various operating conditions. This product is designed with a single clutch device when the cutter shaft rotates at high speed during operation. When stopping work, the tractor suddenly stops power input. The inertia of the cutter shaft is too large, and the single clutch effectively protects the gear and shaft from damage.