Hitachi ZX110-3 ZX120-3 ZX135US-3 Excavator Technical Manual – Operational Principle PDF

Description

File Details

• Manual Type: Technical Manual — Operational Principle (includes Section 1 General)
• Brand: Hitachi Construction Machinery
• Models Covered: ZX110-3, ZX110M-3, ZX120-3, ZX130K-3, ZX130L-3, ZX135US-3, ZX135USK-3, ZX135USL-3
• Engines: ISUZU AJ-4JJ1XYSA-03, ISUZU AJ-4J1XYSA-03
• Language: English
• Page Count: 334
• File Format: PDF
• Publication: Hitachi Construction Machinery Co. Ltd. — revision information to 16 June 2008

Chapters Covered

• Section 1 — General
• Section 2 — System
• Section 3 — Component Operation

Section 1 — General

Opens with the full specifications for the ZX110-3, ZX110M-3, ZX135US-3, ZX135USK-3 and ZX135USL-3, including operating weight, bucket capacity, engine output, ground pressure, swing and travel speeds, and gradeability. Dimensional diagrams with lettered callouts (A through K) are provided for each model group. Working range charts for backhoe and shovel configurations cover maximum digging reach, digging depth, cutting height, dumping height, transport height and length, and minimum swing radius across multiple arm lengths.

Section 2 — System

This is the core of the Hitachi ZX110-3 / ZX120-3 / ZX135US-3 operational principle manual. It explains how the machine’s controllers communicate over the CAN bus network, how the Main Controller (MC), Engine Control Module (ECM) and Information Controller (ICF) interact, and how the monitor unit displays machine data. Engine control, pump control, valve control and other control functions are detailed with condition tables and operation steps — including HP mode, E mode, auto-idle, travel torque-up, arm regenerative control and travel motor displacement angle control. The ECM system chapter covers fuel injection, engine start, EGR, fuel injection amount correction and engine stop control. The hydraulic system chapter breaks down the pilot circuit and main circuit, showing how pressure oil flows through the control valve, signal control valve and pump regulators. The electrical system chapter maps the main circuit, power circuit, starting circuit, charging circuit, surge voltage prevention, pilot shut-off, security lock, engine stop, security horn, working light and wiper circuits.

Section 3 — Component Operation

The component operation section takes each major assembly apart in detail. The pump device chapter explains the swash plate type variable displacement axial plunger pump, the regulator’s four control functions, and how servo pistons and the feedback lever adjust swash plate angle. The swing device chapter covers the two-stage planetary reduction gear, swing motor, parking brake and valve unit. The control valve chapter documents the main relief valve, overload relief valve, flow combiner valve, regenerative valve, anti-drift valve, flow rate control valve, and the auxiliary flow combiner and bypass shut-out valves. The pilot valve chapter explains the PPC pressure proportional control function, lever stroke output curves, and the shockless function on the travel pilot valve. The travel device chapter covers the travel reduction gear, motor, parking brake, travel mode control and travel brake valve. The signal control valve chapter details the shuttle valve, shockless valve, pump flow rate control valves, and the bucket flow rate control valve control spool, flow combiner valve control spool and swing parking brake release spool. The others chapters cover the pilot shut-off solenoid valve, 2-spool solenoid valve units, pilot relief valve, swing bearing, center joint and track adjuster.

How This Manual Supports Diagnostics and Repair

Because this is the operational principle volume, it explains why systems behave the way they do. When a ZX135US-3 exhibits slow travel, unusual arm regeneration, or a swing parking brake that will not release, the circuit descriptions and condition tables in this manual let you trace the signal path from sensor to controller to solenoid valve to actuator. The hydraulic schematics and component cross-sections show exactly which spool, valve or piston is involved. The electrical circuit descriptions show how the monitor unit grounds relays and how the starter cut relay and security relay interact. This is the reference you use before opening the troubleshooting manual — it gives you the system logic needed to interpret fault codes and test results correctly.

Who This Manual Is For

This Hitachi hydraulic excavator technical manual is written for experienced technicians who maintain and repair ZX110-3 class, ZX120-3 class and ZX135US-3 class machines. It assumes familiarity with hydraulic and electrical systems and provides the operational detail needed to understand controller logic, pump regulation, valve function and component operation. Whether you are diagnosing a control issue, verifying a repair, or training a technician on how these machines are designed to work, this manual delivers the system-level knowledge that parts lists and troubleshooting flowcharts alone cannot provide.

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This is the full 334-page Hitachi ZX110-3 ZX120-3 ZX135US-3 Technical Manual — Operational Principle, delivered as a high-quality PDF that opens on any device. No shipping, no waiting, no partial excerpts — you receive the complete document covering Section 1 General, Section 2 System and Section 3 Component Operation. Print the pages you need for the shop, or keep the entire manual on your laptop or tablet for quick reference in the field. If you service Hitachi ZX110-3, ZX120-3 or ZX135US-3 excavators, this operational principle manual belongs in your technical library. Add it to your cart and download it immediately after checkout.