4U series sweet potato harvester is mounted with the tractor of 12-80HP,with back power (side power output shaft). The working principle is that the digging shovel digs out 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 after the clearance of vibration sieve, finally the crops
and soil being separated. 

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