Hitachi ZX470-5A, ZX490LCH-5A, and ZX530LCH-5A Excavator Service Manual

Product Overview

This comprehensive service manual covers the Hitachi Excavator models:

• ZX470-5A
• ZX470LC-5A
• ZX490H-5A
• ZX490LCH-5A
• ZX530LCH-5A

Available in a PDF format and written in English, this manual is an essential tool for operators and technicians.

Manual Inclusions

For Models ZX470-5A, ZX490LCH-5A, and ZX530LCH-5A:

• Service Manual (Troubleshooting) Vol. No. TOJAE-EN: 458 pages
• Service Manual (Operation) Vol. No. TTJAE-EN: 388 pages
• Workshop Manual Vol. No. WJAE-EN: 605 pages
• Circuit Diagram: 21 pages

All information is presented using the International System of Units (SI Units).

Manual Composition

The service manual is a comprehensive resource, consisting of the Operating, Troubleshooting, and Workshop Manuals. This documentation provides:

• Service Manual: Technical information for redelivery and delivery, device activation, performance tests, and troubleshooting procedures.
• Workshop Manual: Detailed guidance for machine maintenance and repair, including tools and equipment, maintenance standards, and assembly/disassembly processes.

For safety, always refer to this manual and use appropriate lifting techniques and equipment when handling heavy parts.

Benefits of the New ZAXIS Series

• Industry-leading hydraulic technologies for unmatched performance
• Impressive fuel economy with swift operational capabilities
• Enhanced operator comfort through easy control and precision
• Durable construction ensuring low maintenance costs and longevity

Understanding the Pump Control Solenoid Valve

Located on the main pump’s regulator, the pump control solenoid valve adjusts the delivery flow rate based on the signal from the Machine Controller (MC):

• In Neutral: Ports are appropriately closed or connected through the spool to control flow.
• In Operation: The solenoid engages, repositioning the spool, which alters the pressure at the output port. Pressure adjustments align with forces applied from springs and the solenoid to stabilize the spool position.

Key pressure components include:

• P1: Pressure at Output Port
• A, B: Pressure Receiving Area on Spool
• S1: Spring 1 Force (causing leftward motion)
• S2: Spring 2 Force (causing rightward return)
• Fsol: Solenoid Force