This service repair manual covers the Yanmar YM155D. The YM155D is equipped with a diesel engine featuring a fuel injection system, cooling system, emission system, and engine control system. Its robust engineering is designed for reliability and efficient operation. This comprehensive manual provides detailed information for maintaining and repairing the Yanmar YM155D. It includes procedures for scheduled maintenance, general maintenance, and troubleshooting. Coverage extends to the brake system, electrical system, suspension system, steering system, axle information, chassis, and restraint system. This guide is an essential resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the vehicle.