This Shop Manual covers the Komatsu WA600-3 Avance and WA600-3D Avance (TBG SPEC.) models, specifically for serial numbers 50001 and up. These machines are engineered for demanding operational environments, reflecting Komatsu's commitment to robust design and reliable performance. The manual provides comprehensive information to ensure these vehicles operate at their peak efficiency and longevity. The purpose of this manual is to enhance the quality of repairs and foster an accurate understanding of the product and its correct repair procedures. It details workshop operations, component checks, adjustments, troubleshooting, disassembly and assembly, and maintenance standards. The manual includes hydraulic and electric circuit diagrams, and may contain information on attachments and options, serving as an essential resource for owners, mechanics, and technicians.