Hitachi Zaxis 330 / 330LC / 350H / 350LCH / 370MTH Excavator Workshop Manual (P/N W1HH-E-01)

• Covers 2005 Hitachi Zaxis 330, 330LC, 350H, 350LCH, and 370MTH hydraulic excavators, detailing maintenance and assembly procedures for upperstructure and undercarriage systems
• Official Hitachi Workshop Manual Vol. W1HH-E-01 (P/N KM-1HH-E), published 2005
• Contains 752 pages including dozens of exploded-view diagrams, torque specifications, and system maintenance data
• This specific edition provides the precise torque values and assembly clearances required for the KM-1HH-E series excavators
• Outlines teardown steps for travel devices, track adjusters, center joints, swing bearings, and front idlers
• Explores boom cylinders, arm cylinders, bucket cylinders, and pilot shut-off valves

Component and Assembly Documentation

Equipping your shop with accurate factory data is critical for heavy equipment maintenance. This 752-page PDF manual serves as the primary technical reference for Hitachi Zaxis 330, 330LC, 350H, 350LCH, and 370MTH models. While diagnostic and troubleshooting steps are covered in companion volumes, this mechanical guide focuses heavily on upperstructure and undercarriage teardown and rebuild procedures to effectively fix complex issues. Mechanics will find specific data for the cab, counterweight, main frame, and pump devices. The sections are logically organized to assist technicians in handling complex hydraulic components like control valves, solenoid valves, shockless valves, and swing devices.

The immediate benefit for any working shop is the ability to keep heavy maintenance in-house. Instead of outsourcing to an expensive dealership, technicians can follow the step-by-step instructions to completely overhaul the travel motor, repack the hydraulic cylinders, and rebuild the main pump device. To ensure absolute accuracy during reassembly, the text is heavily illustrated with cross-sectional views, assembly schematics, dimensional layouts, and component drawings. Having the exact factory clearance tolerances right at your workbench prevents the improper fitment that often leads to premature component failure.

Experienced heavy equipment technicians know that these Zaxis models have specific repair pitfalls. For instance, failing to manually bleed air from the main hydraulic pump housing after a fluid drain will cause immediate, catastrophic pump cavitation upon engine startup. Furthermore, when overhauling upper and lower rollers, if the floating seal O-rings are not seated perfectly parallel to the mating face, gear oil leakage and assembly failure are virtually guaranteed.

When servicing heavy machinery, following proper factory safety protocols—such as completely releasing residual pressure from the hydraulic tank before disassembly—and verifying clearances before operation is crucial to prevent severe injury or component failure. Additional chapters document specific installation parameters, ensuring technicians apply the exact specifications for hydraulic circuits and pressure systems. Maintenance standards and factory painting color codes are also detailed to help restore units to OEM requirements.

Specification Highlights

Technical data includes comprehensive tightening torque charts for T, H, and M grade bolts, alongside specialized requirements for hydraulic hoses and piping. Knowing exact component weights beforehand—such as the 480 kg travel device or the 320 kg boom cylinder—eliminates unsafe lifting practices and significantly improves shop safety. The pump device data confirms a total unit weight of 205 kg, with the main pump weight listed at 67 kg for lifting and service considerations. Counterweight mass is precisely documented at 6800 kg for 330-series units and 7550 kg for 350- and 370-series variants. As the authoritative reference for 2005 Zaxis models, it covers all structural assembly, hydraulic component integration, and technical specifications for the KM-1HH-E build.