1coupling is the use of diesel + car + belt and the form of cars and pump-driven winch. 
2 reasonable force distribution, power utilization high. 
3 within the variable-speed winch, the use of non-stop machine clutch transmission, the realization of the four are two stalls down six or six to eight are two stalls down. 
4 the main brake is hydraulic disc brake, auxiliary brake is electromagnetic eddy current brake.
5Modular design, reasonable layout. Host module, "Former high low" of the layout. To achieve low power and transmission installed.
6fishing with sand drum, mechanical friction and the wheel drive Oxytropis