This workshop service manual covers the JCB JS330 Auto excavator, designed for heavy-duty construction and excavation tasks. This tracked machine features a powerful 6.7-liter Cummins QSB6.7 diesel engine, delivering approximately 224 HP and meeting Tier 2 and Tier 3 emissions standards. Its hydrostatic transmission ensures efficient power delivery, while its robust construction supports an operating weight of approximately 33,000 kg. Notable performance capabilities include a maximum digging depth of 6.96 meters and a maximum digging reach of 10.35 meters, making it a reliable and versatile tool for demanding job sites. This comprehensive English-language manual provides essential information for the maintenance, repair, and operation of the JCB JS330 Auto. It details critical procedures for servicing, including fluid capacities for engine oil, hydraulic oil, and fuel. Technical specifications, troubleshooting guides, and safety recommendations are also included to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of the equipment. The manual is applicable to serial numbers within the ranges 1224510-1224999 and 1240500-1240999.