This shop manual provides information for maintaining a Komatsu D155AX-5 excavator. It may include optional equipment not available in all areas. The D155AX-5 is equipped with either an SA6D140E-2 or SA6D140E-3 engine, with engine-specific information available in separate manuals. The manual contains sections covering general information, structure and function, testing and adjusting, disassembly and assembly, maintenance standards, and other topics to service the excavator.