The Allis Chalmers WC Speed Maintainer is a motor grader produced from 1938 to 1941 by Allis Chalmers in LaPorte, Indiana, USA. A total of 411 units were built. It features a 3.3L 4-cylinder liquid-cooled gasoline engine with a rated speed of 1300 RPM and a firing order of 1-2-4-3. The tractor is two-wheel drive with an open operator station.