An agricultural harvesting implement including a tractor chassis having a fore-and-aft extending frame with an engine, drive wheels having drive wheel axles supporting a first end of the frame and steerable wheels supporting a second end of the frame, drive transmission structure connected to the engine and to the drive wheels and having a mechanical front wheel drive (MFWD) output, a power take off (PTO) shaft driven by the engine independently of the MFWD output, wherein the speed of the MFWD output is synchronized with the speed of the drive wheels, a cotton row harvesting unit extending from the first end of the frame and including rotating spindles drums with spindles projecting into a row of cotton plants, a crop basket supported by the frame, a crop conveying fan supported by the frame, and a crop conveying duct extending from the row unit to the basket, the improvement comprising:
- a row unit drive connected to the MFWD output, the MFWD output thereby driving the row unit at a speed dependent on the speed of the drive wheels to synchronize spindle drum rotation with harvester ground speed, and a drive powering the fan from the PTO shaft for operating the fan independently of the row harvesting unit.