The gear box of the mini-tiller is divided into upper and lower gear box,also known as transmission boxes.The upper gear box is mainly connected to reverse gear,shift,clutch,while driving the lower gear box operation.From the material point of view,the upper box has 80 cast iron box and 75 aluminum alloy box.80's color is usually red,and 75's color is silver.However,belt driven machine is difference with gear driven machine.It only has the pulley rotary system to drive the chain.Therefore,it is more suitable for soft soil.