Hitachi EX220-2 / EX220LC-2 Excavator Service Manual (P/N T01-01-01)

This official technical publication (T01-01-01) details the 1990–1998 Hitachi EX220-2 and EX220LC-2 excavators, specifically covering the 15B-series build. With 616 pages of system schematics, hydraulic flow diagrams, and component overviews, the manual delivers the precise engineering data required to understand the HINO H06CT-T engine and its associated hydraulic systems.

System Construction and Functional Walkthrough

Understanding core excavator subsystems directly speeds up diagnostics on the shop floor. This documentation breaks down the upperstructure layout, providing a clear look at the variable-displacement main pump (HPV091DW) and pilot gear pump assemblies. It explains the exact construction and operational logic of the main control valves, swing motor devices, and hydraulic pilot controls. Need to trace a fluid path? Detailed schematics map out the circuit flow for the arm regenerative valve, surge relief mechanisms, and the variable pressure compensated valve (VPCV) system used for load sensing.

Specification Highlights and Safety Data

Accurate capacities prevent guesswork during heavy shop maintenance. The text outlines critical volumes, including the 310-liter fuel tank and the 26-liter engine oil requirement for the HINO powerplant. Total hydraulic system capacity sits at 260 liters. You will also find reference values for system pressures, such as the 49 bar pilot pressure and specific swing dampener settings.

Working around high-pressure hydraulics requires absolute precision to avoid severe injury or equipment damage. Always verify the variable pressure settings for the DP-sensor and accumulator charging procedures directly against the specifications provided here before making any physical adjustments to the machine.

Beyond fluids and pressures, the documentation covers structural capabilities. For example, the maximum vertical wall digging depth for the 3.61 m arm configuration is accurately listed at 6,740 mm.