The JCB JS145 Auto Tier 3 is a robust excavator designed for demanding work environments. Featuring a powerful 103 HP (76 kW) Tier 3 Diesel Engine with a displacement of 4400 cc, this machine is engineered for reliability and efficiency. Its liquid-cooled system ensures optimal performance under load, while the hydrostatic transmission with 2 speeds provides versatile control for various applications. With an operating weight of 14,500 kg and dimensions optimized for maneuverability, including a length of 7.58 meters with a standard boom, a width of 2.75 meters over tracks, and a height of 2.98 meters to the cab top, the JS145 is built to tackle construction and heavy-duty tasks with precision and power. This Workshop Service Repair Manual provides comprehensive guidance for the JCB JS145 Auto Tier 3, covering serial numbers from 1600011 to 1600999. It details essential maintenance procedures, including fluid capacities for engine oil (16 liters), the hydraulic system (220 liters), and the fuel tank (250 liters), along with service intervals for engine oil changes (500 hours) and hydraulic filter replacement (1000 hours). The manual also includes technical specifications, troubleshooting steps, and safety guidelines, serving as an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance and longevity of their equipment.