The JCB JS330 Auto Tier 3 is a robust Tracked Excavator engineered for demanding work environments. Featuring a powerful Cummins QSC8.3 diesel engine with a gross power output of 212 hp (158 kW) and a displacement of 8.3 liters, this machine is built for reliability and performance. Its hydrostatic transmission and 4WD system provide efficient power delivery, while its substantial operating weight of 33,000 kg (72,750 lbs) ensures stability. With a length of 10.96 m (35 ft 11 in) with the bucket, a width of 3.34 m (10 ft 11 in), and a height to the top of the cab of 3.12 m (10 ft 3 in), the JS330 Auto is designed for significant operational capacity. This Workshop Repair Service Manual provides comprehensive technical information for the JCB JS330 Auto Tracked Excavator, covering serial numbers 1224510-1224999 and 1240500-1240999. It details essential maintenance procedures, including fluid capacities for engine oil, hydraulic systems, and coolant, alongside service schedules for initial and regular intervals. The manual also covers routine maintenance items such as greasing points and air filter replacement. Its purpose is to equip owners, mechanics, and technicians with the knowledge required for effective maintenance, repair, and troubleshooting, ensuring the longevity and optimal performance of the equipment.