1. The use of a simple floor structure and an external divider is easy for maintenance; 2. The safety frame is optional; 3. The single-acting or double-acting clutch is optional; 4. The various gear configurations, such as 8+2, 8+8, and 16+4 are optional, and the velocity distribution is reasonable to meet different operating needs; 5. The synchronized shuttle shift is optional, and the operation is easy, flexible and reliable; 6. The operations of hydraulic steering, the mandrel cylinder front drive axle are easy and flexible.