Harvesting units

A tractor drawn harvester including a tined shaker unit that rapidly strikes fruit bearing branches of trees or bushes to dislodge fruit, the shaker unit being operatively mounted on a frame structure having a generally horizontal portion and vertical portion mounting the shaker unit for movement transverse to a row of trees being harvested, the frame structure having a hitch at its forward end connectable to a tractor and a pair of wheels at its trailing end, the improvement in said frame structure comprising a platform mounting a power unit providing pressure fluid for operating the shaker unit, said platform being mounted on the frame structure and being displaceable transversely relative to a row of trees, selectively operable means for moving the shaker unit toward the row of trees so that the tines achieve the desired penetration, and means for displacing said power unit transversely in a direction opposite to the direction in which the shaker unit is moved to thereby maintain the resultant center of gravity between the wheels.