This document is a workshop manual that provides safety regulations, general instructions, technical specifications, maintenance procedures, and troubleshooting information for Rider 11, Rider 13, and Rider 16 ride-on lawn mowers. It includes details on the engine, steering, transmission, battery, wheels, mowing deck, and electrical systems. The manual describes maintenance tasks like checking oil levels, adjusting the mowing deck, and replacing parts like the belts, blades, and hydrostatic transmission components. Special tools required for repairs are also listed.