Employment of forced plant conveyor with auxiliary divider to the front assembly to replace the old one is studied. This device can make the plant holding upright more stably and eliminates the winding problems resulted from abnormal long vines. With the aid of a strengthen ejector and a break-away device, the discharge of plant after picking becomes certain. The load may be reduced by the modification of the front upper conveyor and the driving shaft of the bagging units. There are no damage and slippage found by using the driving unit. The general capacity of the harvester is then increased to a desired rate.