Hitachi ZX70-3 ZX70LC-3 ZX70LCN-3 ZX75US-3 ZX85US-3 Hydraulic Excavator Workshop Manual – PDF Download

Description

Hitachi ZX70-3 / ZX70LC-3 / ZX70LCN-3 / ZX75US-3 / ZX85US-3 Workshop Manual

This Hitachi Workshop Manual is the full service and repair document for the ZX70-3, ZX70LC-3, ZX70LCN-3, ZX75US-3 and ZX85US-3 hydraulic excavators. It is written for the experienced technician and covers the complete machine from the cab and counterweight down to the track links, plus the ISUZU 4LE2 diesel engine. Every removal and installation procedure, every disassembly and assembly sequence, every tightening torque and every maintenance standard in this manual is presented with the illustrations, exploded views and step-by-step instructions needed to do the job correctly.

File Details

• Manual Type: Workshop Manual
• Brand: Hitachi
• Models Covered: ZX70-3, ZX70LC-3, ZX70LCN-3, ZX75US-3, ZX85US-3
• Language: English
• Page Count: 710
• File Format: PDF
• Part No.: W1P1-E-00
• Date: 2008.03

Chapters Covered

• Section 1 — General: Precautions for Disassembling and Assembling, Tightening, Painting, Bleeding Air from Hydraulic Oil Tank
• Section 2 — Upperstructure: Cab, Counterweight, Main Frame, Pump Device, Control Valve, Swing Device, Pilot Valve, Pilot Shut-Off Solenoid Valve, Shockless Valve, Solenoid Valve Unit, Engine
• Section 3 — Undercarriage: Swing Bearing, Travel Device, Center Joint, Track Adjuster, Front Idler, Upper and Lower Roller, Track
• Section 4 — Front Attachment: Front Attachment, Cylinder
• Section 5 — Engine: General Information, Engine

Section 1 — General

The General section opens with the precautions that apply to every disassembly and assembly job on the ZX70-3 family. It explains how to clean and inspect the machine before work begins, how to cap and plug open lines, how to match-mark components, and how to store common parts so nothing is lost. The maintenance standard terminology is defined here — nominal dimension, assembly specification, allowable limit — so you know exactly what the numbers in the rest of the manual mean. The tightening chapter contains torque specifications, the torque chart, piping joint procedures, and the periodic replacement parts table. There is a dedicated procedure for bleeding air from the hydraulic oil tank, which must be performed before any work on the hydraulic system. Painting specifications for the uppertructure, front attachment, track and cab are also included.

Section 2 — Upperstructure

This is the largest section of the manual and covers everything above the swing bearing. The cab chapter gives removal and installation procedures with the weight of the cab stated, plus dimensions for the cab glass and the adhesive bonding procedure for right-hand glass, rear left-hand glass, lower door glass and rear glass. The counterweight chapter covers removal and installation for both the ZX70-3 and ZX75US-3 variants. The main frame chapter explains how to remove and install the uppertructure, including the matching marks on the swing bearing and the use of chain blocks to level the centre of gravity.

The pump device chapter is extensive: it covers removal and installation of the pump device for ZX70-3 and ZX75US-3, disassembly and assembly of Main Pump 3, disassembly and assembly of Main Pumps 1 and 2, the structure of the gear pump assembly, and the maintenance standard for piston, cylinder, spring and retainer. The control valve chapter covers removal, installation, disassembly and assembly, with sections on the housing, spools, covers, relief valves, anti-drift valve, shut-off valves, signal plug and the various poppets and springs. The swing device chapter covers removal and installation, disassembly and assembly of the swing device, swing motor and valve block, plus the maintenance standard. The pilot valve chapter covers left and right pilot valves, travel pilot valve and blade pilot valve with full disassembly and assembly procedures. The pilot shut-off solenoid valve, shockless valve, solenoid valve unit and engine removal and installation for both ZX70-3 and ZX75US-3 complete the section.

Section 3 — Undercarriage

The undercarriage section covers the swing bearing with removal and installation, disassembly and assembly procedures including the ball and support replacement. The travel device chapter is detailed: removal and installation, disassembly and assembly of the travel device, disassembly and assembly of the travel motor, disassembly and assembly of the brake valve, and the maintenance standard for sprocket, travel motor and parking brake. The centre joint chapter covers removal and installation for ZX70-3 and ZX75US-3, disassembly and assembly, and the maintenance standard for bushing, body and spindle. The track adjuster chapter covers removal and installation, disassembly and assembly with the special tool, and the spring compression specifications. The front idler, upper and lower roller, and track chapters complete the section with removal and installation, disassembly and assembly, and maintenance standards for each component.

Section 4 — Front Attachment

This section covers the front attachment and the cylinders. The front attachment chapter includes the hydraulic circuit pressure release procedure, removal and installation of the front attachment for ZX70-3 and ZX75US-3, the maintenance standard for pins and bushings, and the standard dimensions for arm and bucket connection. The cylinder chapter covers the hydraulic circuit pressure release procedure, removal and installation of bucket cylinder, arm cylinder, boom cylinder and blade cylinder, plus disassembly and assembly of each cylinder with the seal replacement procedures and tightening torques for the piston nuts and cylinder heads.

Section 5 — Engine

The engine section covers the ISUZU 4LE2 diesel engine. General information includes service precautions, reading the model, recommended lubricant, list of trouble symptoms and the repair standard. The engine mechanical chapter covers the complete engine: engine accessories, engine exterior equipment, rocker arm shaft, cylinder head, piston and connecting rod, flywheel, crankshaft front and rear oil seals, timing gear train, camshaft, crankshaft, cylinder block, and the special tools. The cooling system chapter covers the water pump, thermostat and fan clutch. The fuel system covers the fuel system and governor. The electrical system covers the charging system, generator (24V-50A), starting system and starter. The exhaust system covers EGR control. The lubrication system covers the oil filter and oil pump. The intake system covers the turbocharger. The preheating system covers the glow plug and trouble symptoms.

Why This Hitachi ZX70-3 Workshop Manual Matters

When you are working on a Hitachi ZX70-3, ZX70LC-3, ZX70LCN-3, ZX75US-3 or ZX85US-3 excavator, the difference between a job done right and a job done twice is having the correct procedure and the correct specification in front of you. This manual gives you the Hitachi factory procedures for disassembling and assembling the machine, the tightening torques for every critical fastener, the maintenance standards that tell you when a part is worn out and must be replaced, and the special tools required for the job. Whether you are resealing a boom cylinder, rebuilding a travel motor, replacing a swing bearing, adjusting the track tension or overhauling the ISUZU 4LE2 engine, the step-by-step instructions and the accompanying illustrations guide you through the work.

The manual covers the ZX70-3, ZX70LC-3, ZX70LCN-3, ZX75US-3 and ZX85US-3, so it is suitable for a workshop that services more than one machine from this Hitachi range. The engine section alone covers the complete 4LE2 diesel engine, from the cylinder head and pistons to the turbocharger, fuel system, cooling system and electrical system, with the repair standards and service limits that let you measure wear accurately and decide whether to repair or replace. The hydraulic section covers the pump device, control valve, swing device, pilot valves, shockless valve, solenoid valve unit and the cylinders, so you can diagnose and repair the hydraulic system with confidence.

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Instant PDF Download — No Shipping, No Waiting

This Hitachi Workshop Manual is delivered as an instant PDF download. There is no shipping, no waiting for a disc or a printed book, and no customs delay. Once your payment is complete, you can download the manual and open it on any device — laptop, desktop, tablet or smartphone. You can print the pages you need for the workshop, keep the full manual on your computer for reference, or search the PDF for the specific model, system or procedure you are working on. The PDF format means you can zoom in on the detailed illustrations and exploded views, and you can print multiple copies for your team. Whether you are a professional technician, a workshop manager or an owner-operator who does their own maintenance, this manual gives you the information you need, when you need it.

Models Covered in Detail

The manual covers the ZX70-3, ZX70LC-3, ZX70LCN-3, ZX75US-3 and ZX85US-3 hydraulic excavators. Where procedures differ between models — for example the counterweight removal, main frame removal, pump device removal, control valve removal, swing device removal, centre joint removal and engine removal — the manual provides separate procedures for the ZX70-3 and the ZX75US-3, so you are not trying to adapt a procedure that was written for a different machine. The ZX70LC-3 and ZX70LCN-3 share the ZX70-3 procedures, and the ZX85US-3 shares the ZX75US-3 procedures where the machines are common. This model-specific approach is what makes the manual practical for the workshop.