The Gleaner Manufacturing Company is an American manufacturer of combine harvesters. Gleaner has been a popular brand of combine harvester particularly in the Midwestern United States for many decades, first as an independent firm, then later as a division of Allis-Chalmers. The Gleaner brand continues today under the ownership of AGCO.
Gleaner combines date back to 1923, when the Baldwin brothers of Nickerson, Kansas, created a high-quality and reliable self-propelled combine harvester. They decided to use the "Gleaner" name for their radically redesigned grain harvesting machine based on inspiration from "The Gleaners", a famous 1857 painting by Jean-François Millet. Gleaning is the act of collecting leftover crops from farmers' fields after they have been commercially harvested, or on fields where it is not economically profitable to harvest, and in the , it is the act of frugally recovering resources from low-yield contexts. Thus, with the Gleaner name, the company evoked a positive connotation in potential customers' minds, of a brand of harvester that would leave none of the grain behind. A combine harvester combines the reaping (plus or minus binding), threshing, and winnowing functions all into one machine—hence the "combine" part of its name. To that list, the Baldwin brothers' Gleaner added self-propulsion. Earlier combines, the so-called pull-type or tractor-drawn combines, were towed by tractors.
The original Gleaner design was mounted on a Fordson Model F. It had an original retail price of USD $950 FOB from the factory in Nickerson. This design was manufactured between 1923 and 1928.
The Gleaner was one of the pioneers in self-propelled combines. They were often considered the "Cadillac" of the industry because of this feature and because of their sound engineering. Buescher (1991) credited the design principally to one of the brothers, Curt Baldwin, and explained that it focused on the needs of custom cutters like the Baldwin brothers themselves—contractors who move north with the harvest season, selling harvesting services to farmers. It resulted in machines that were extraordinarily reliable and useful, which benefited not only custom cutters but anyone who bought a Gleaner. The short wheelbase and axle track allowed the combine to fit on a truck. The grain header did not need to be detached for transit, because it fit over the cab of the truck. Buescher said, "Since custom cutters didn't know where their next parts supply source would be, Baldwin designed his combine so that it wouldn't need parts." (Buescher's tongue-in-cheek point is that the machines were designed and built well so that need for repairs would be minimal.) The frame was "like a bridge" in its strength. The bearings were chosen with service in mind—large and good quality (to obviate service) and of common sizes (so that the operator could carry merely a small stock of spares in his truck and yet be certain to have the size he needed when a replacement did become necessary). The Gleaner's exterior sheet metal was galvanized (zinc plated), giving it weather resistance superior to that of typical farm equipment, which was painted but not plated. As Buescher said, "Baldwin reasoned that most of his combines would sit outdoors. Texas and Oklahoma dust storms have a way of peeling paint off of machinery." As a result of the silver color of the zinc plating, the Gleaner brand ended up having a distinctive color (just as Allis had Persian Orange, IH had red, and John Deere had green), despite the sheet metal not even having any paint.