The Komatsu D155A-3 Crawler Tractor, produced primarily in the late 1980s and 1990s, is a robust piece of heavy construction equipment designed for demanding earthmoving, grading, site preparation, mining, and forestry applications. Known for its durable engineering and reliable performance, this model represents a significant lineage of Komatsu's medium to large crawler dozers. It features a powerful Komatsu S6D125E-2 diesel engine and a sophisticated hydrostatic steering system coupled with a torque converter and power shift transmission, offering efficient power transfer and operational control. Its low ground pressure design ensures stability across various terrains, making it a dependable workhorse in challenging environments.

This comprehensive Workshop Service Repair Manual for the Komatsu D155A-3 Crawler Tractor, covering serial numbers 60001 and up, provides essential technical data and procedural guidance for maintaining and repairing this vital machinery. The manual details engine, powertrain, undercarriage, hydraulic, electrical, braking, steering, cooling, and lubrication systems, offering step-by-step instructions for disassembly, assembly, troubleshooting, and overhaul. It includes routine maintenance procedures, special tool usage, adjustment guidelines, and advanced diagnostic information, along with detailed specifications such as torque values and fluid capacities. This resource is indispensable for owners, mechanics, and technicians aiming to minimize downtime and ensure the optimal operational efficiency and longevity of their D155A-3 crawler tractor.