A harvester machine includes a plurality of harvester units that can be positioned side-by-side in a row that extends across the direction of operative travel in front of a tractor. The tractor is connected to a first coupling to push the machine when processing crop and a second coupling at one side of the machine can be used to tow the machine during transport; the units then being located one behind the other. Each unit includes cutting, threshing and cleaning means and a delivery device communicates with the units to remove grain through one or more outlets that extend over the tractor to a rear container. The units are interconnected by pivot connections at their sides with pivot axes extending in the direction of operative travel. Adjustable castor wheels support the units at the desired height and a common drive from the tractor engages the various threshing, cleaning, mowing and delivery devices including blowers.