This document is a service manual for the Groundsmaster 300 series. It contains chapters covering the engine, hydraulic system, electrical system, axles, steering/brakes, transmission, cutting units and safety instructions. The manual provides service technicians with information for troubleshooting, testing, and repairing major systems and components. It directs technicians to use this manual along with the operator's manual and parts catalog specific to the machine model and serial number being worked on.