This repair kit contains the components needed to restore the cutterbar drive head on a combine header. It sits at the interface between the drive input and the knife-drive assembly, transmitting rotational motion into the reciprocating action of the sickle bar. A worn or failed head produces uneven knife stroke, leading to ragged crop cut and increased shatter loss. The kit includes the seals, bearings, and fasteners that match the original assembly’s geometry, so the head can be rebuilt without modifying the housing or drive shaft. On reassembly, replace the housing gasket and torque the retaining bolts to the specification for the host machine.