●Adopt chain as the main drive; 2～4 diesel engine - torque converter (or coupler) drive unit, use several rows of small sleeve roller chains to compound the units, and then generally belt drive all the unit. commonly,still use belt drive pump.

When compounding by high-quality multi-row fine pitch chain,the transmission power is greater than the vee belt, the structure is compact, servicing life is long, and suitable for all levels of drilling.