This document is a repair manual that provides information for servicing 410/420 series skid steer loaders and 420CT compact track loaders, including Tier 3 and cab upgrade machines. It contains sections covering general information, engines, fuel systems, electrical systems, tracks, power trains, brakes, hydraulics, mounted equipment, and schematics. The manual provides maintenance procedures, specifications, part numbers, fluid types and capacities to service these machines.