This manual covers the Komatsu WA270-3 and WA270PT-3 series wheel loaders, designed for robust performance in various operational environments. These machines are engineered for reliability and efficiency, featuring a Komatsu S6D102E-1 engine and a Komatsu Hydra-Shift Transmission (HST). The WA270-3 and WA270PT-3 models are built to handle demanding tasks, embodying Komatsu's commitment to durable and powerful equipment. This service repair manual is intended for all years of production within the specified serial number ranges, ensuring comprehensive support for these versatile loaders. The purpose of this comprehensive English-language service repair manual is to provide detailed information for the maintenance and repair of the Komatsu WA270-3 and WA270PT-3 wheel loaders. It includes essential sections on safety, general information, structure and function, testing and adjusting, and disassembly and assembly procedures. The manual offers step-by-step instructions and is designed to assist owners and technicians in performing maintenance, troubleshooting, and repairs effectively, ultimately contributing to cost savings and optimal equipment performance.