The Hitachi ZAXIS ZX 135US-3, ZX 135USK-3, and ZX 135USL-3 series excavators represent robust and reliable machinery engineered for demanding operational environments. These units are powered by a Hino J05E-TT diesel engine, delivering a gross power of 86 kW (115 hp), and feature a hydrostatic transmission with planetary gear reduction for efficient power transfer. With an operating weight ranging from 13,700 to 14,900 kg, these excavators are designed for versatility and performance in various construction and industrial applications, embodying Hitachi's commitment to quality and durability. This comprehensive service repair manual provides essential information for the maintenance and repair of the Hitachi ZAXIS 3 Series excavators. It covers critical areas including detailed engine specifications, transmission system diagnostics, fluid capacities, and scheduled maintenance intervals for engine oil, hydraulic fluid, and fuel filters. The manual is intended to assist owners, technicians, and mechanics in understanding the vehicle's systems, performing routine upkeep, and addressing potential issues, ensuring optimal performance and longevity of the equipment.