4U系列番薯类挖掘机与具有后动力(或侧置动力)输出轴的12-60马力拖拉机配套使用。其工作原理是通过拖拉机的带动,挖掘铲将土及收获物挖起，通过震动筛使收获物和土壤实现分离。

4UD series of sweet potato harvester is mounted with the tractor of 12-60HP with back power(side power)output shaft.The working principle is that the digging shovel digs up the soil and crops through the impetus of the tractor.And the digging shovel make crop and soil separate through vibration sieve,the soil first drip down from the clearance of vibration sieve,finally the crop crashed down on to the road from the back..