Abstract: The invention comprises a shaft unit adapted for an in-line connection with the power takeoff of a tractor, with a sprocket wheel of a belt-drive centrifugal pump for driving the pump to supply hydraulic power to spraying equipment pulled by the tractor, and further with a hydraulic pump for driving that pump for driving that pump to supply hydraulic power to planting equipment pulled by the tractor, the shaft unit comprising a pair of straight shafts releasably locked in inserted, releasable relationship with each other within the centrifugal pump sprocket wheel, and extending therefrom to the power takeoff on one side of the sprocket wheel and to the hydraulic pump on the other side of the sprocket wheel.