A doffer assembly for a cotton harvester having at least one drum and a spindle. The doffer assembly includes an outer housing and a plurality of doffers adapted to remove cotton from the spindle. The assembly further includes a drive unit coupled to the outer housing for rotatably driving the plurality of doffers independently of at least one drum and spindle. A drive shaft is rotatably driven by the drive unit, and an interface adapter is coupled between the drive shaft and the plurality of doffers. The drive unit may be an electric motor, hydraulic motor, a mechanical drive system, or a combination thereof.

High efficiency work vehicle drivetrains containing variator assemblies are provided. In one embodiment, the work vehicle drivetrain includes an engine, a variator assembly, and an auxiliary power takeoff (PTO) shaft, which is coupled to the engine and rotatable about a primary power path axis when driven by the engine. The variator assembly includes, in turn, a variator motor and a variator gearbox. The variator gearbox contains a planetary gear system, which is coupled to the variator motor and to the auxiliary PTO shaft. The planetary gear system is rotatable about a planetary axis substantially parallel and offset from the primary power path axis.

An outlet assembly for a row unit of an agricultural harvester includes an input portion configured to be coupled to a frame of the row unit. The input portion includes an inlet configured to receive agricultural product and an outlet configured to expel the agricultural product. The outlet assembly also includes an output portion having an inlet configured to receive the agricultural product from the outlet of the input portion and an outlet configured to direct the agricultural product into a duct of an air-assisted conveying system. The output portion and the input portion are at least selectively coupled to one another and configured to at least selectively rotate relative to one another.