Hitachi Zaxis 330 330LC 350H 350LCH 370MTH Excavator Workshop Manual – W1HH-E

Description

Hitachi Zaxis 330 330LC 350H 350LCH 370MTH Excavator Workshop Manual

This is the complete Workshop Manual for the Hitachi Zaxis 330, 330LC, 350H, 350LCH and 370MTH excavators, published under manual number W1HH-E. It is the hands-on volume of the three-part Hitachi service documentation set, written for the experienced technician who needs to remove, disassemble, inspect, reassemble and install the major components of these machines. Where the Technical Manual (Operational Principle) volume explains how systems work and the Technical Manual (Troubleshooting) volume helps diagnose faults, this Hitachi Zaxis 330 330LC 350H 350LCH 370MTH Excavator Workshop Manual gives you the actual procedures, tightening torques, maintenance standards and step-by-step teardown/rebuild sequences needed to carry out the work.

At 752 pages, this is a full-size workshop reference, not a summary. It covers the cab, counterweight, main frame, pump device, control valve, swing device, pilot valves, shockless valve, solenoid valve, swing bearing, travel device, center joint, track adjuster, front idler, rollers, track, front attachment and cylinders in detail. The final section covers the engine and accessory system. Whether you are resealing a boom cylinder, rebuilding a travel motor, adjusting track tension, replacing a swing bearing or pulling the main pump, this manual gives you the manufacturer’s method rather than a generic guess.

File Details

• Manual type: Workshop Manual (maintenance, repair, removal/installation, disassembly/assembly)
• Brand: Hitachi
• Models covered: ZAXIS 330, ZAXIS 330LC, ZAXIS 350H, ZAXIS 350LCH, ZAXIS 370MTH
• Document number: W1HH-E (Manual No. KM-1HH-E is the parent three-volume service manual set)
• Language: English
• Page count: 752 pages
• File format: PDF
• Volume: Workshop Manual (Vol. No. W1HH-E)

Chapters Covered

The table of contents of this workshop manual is organised into five sections, each broken into numbered groups:

• Section 1 – General Information
  • Group 1: Precautions for Disassembling and Assembling
  • Group 2: Tightening Torque
  • Group 3: Painting
• Section 2 – Upperstructure
  • Group 1: Cab
  • Group 2: Counterweight
  • Group 3: Main Frame
  • Group 4: Pump Device
  • Group 5: Control Valve
  • Group 6: Swing Device
  • Group 7: Pilot Valve
  • Group 8: Pilot Shut-Off Valve
  • Group 9: Shockless Valve
  • Group 10: Solenoid Valve
• Section 3 – Undercarriage
  • Group 1: Swing Bearing
  • Group 2: Travel Device
  • Group 3: Center Joint
  • Group 4: Track Adjuster
  • Group 5: Front Idler
  • Group 6: Upper and Lower Roller
  • Group 7: Track
• Section 4 – Front Attachment
  • Group 1: Front Attachment
  • Group 2: Cylinder
• Section 5 – Engine and Accessory
  • General Information, Service Information, Engine Mechanical, Engine Cooling, Engine Fuel, Starting and Charging, Engine Lubrication, Engine Induction

Within those groups, each component is documented from the removal stage through to installation, with the intermediate disassembly and assembly procedures given step by step. Maintenance standards with standard dimensions and allowable limits are supplied for the major components, so you can measure wear and decide whether a part can be reused, repaired or must be replaced. Piping joints, O-ring seal joints, screw-in connections, hose connection rules, bolt locking methods, tightening order and periodic replacement intervals are all covered in the General Information section. The whole document is laid out so that the technician can work through a repair in the same order the factory does.

What This Workshop Manual Gives You

The value of this Hitachi Zaxis 330 330LC 350H 350LCH 370MTH Excavator Workshop Manual is that it does not stop at describing what a component does. It tells you how to take it apart, what to inspect, what to measure, which special tool to use and how to put it back together with the correct torque. For a machine of this size, that level of detail matters: the counterweight alone weighs up to 7550 kg (16650 lb), the front attachment up to 7120 kg (15700 lb), and the uppertructure 6560 kg (14460 lb). Lifting and supporting the machine correctly is part of the procedures, and the manual calls out the weights, the sling points, the eyebolt sizes and the special tools needed.

The component coverage is broad and deep. In the upperstructure section, for example, the pump device is documented through removal and installation, then disassembly and assembly of the pump device, main pump and regulator, with a separate procedure for the pilot pump and a maintenance standard table. The control valve is broken into multiple disassembly/assembly stages plus a valve structure reference. The swing device covers removal, installation, disassembly, assembly, swing motor disassembly and assembly, parking brake release valve and maintenance standards. The pilot valve section is split by serial number (up to serial No. 320880 and serial No. 320881 and up) and by machine date (before March 2003 and after April 2003), so the correct procedure is used for the machine in front of you.

In the undercarriage, the travel device is covered in three separate blocks according to serial number and model: ZAXIS330, 330LC, 350H, 350LCH up to serial No. 31357; ZAXIS330, 330LC, 350H, 350LCH serial No. 31358 and up; and ZAXIS370MTH. Each block includes removal, installation, disassembly, assembly, travel motor disassembly and assembly, brake valve disassembly and assembly, and maintenance standards. The track adjuster is similarly split between ZAXIS330/330LC/350H/350LCH and ZAXIS370MTH. That serial-number awareness is one of the most useful things about this manual — it prevents you from applying the wrong clearance, torque or assembly order to an early or late machine.

The front attachment section covers removal and installation of the complete front attachment, maintenance standards for pins and bushings, standard dimensions for arm and bucket connection and for arm and boom connection, and then cylinder removal, installation, disassembly and assembly. The cylinder procedures are again split by serial number (up to serial No. 33099 and serial No. 33100 and up) for the boom, arm and bucket cylinders. Rod wear limits, bushing inner diameter limits, rod bend and run-out limits are all listed with standard and allowable values, so a cylinder can be assessed against the factory’s own criteria.

Because this is the Workshop Manual volume, it is the right document for the person doing the work rather than the person studying the theory. It assumes you already know how to operate the machine and that you have the necessary tools, including the special tools named throughout the text. It does not replace the Operator’s Manual or the Parts Catalog, and it does not include the troubleshooting flowcharts or the operational principle explanations that belong to the other two volumes of the KM-1HH-E set.

Who This Manual Is For

This Hitachi Zaxis 330 330LC 350H 350LCH 370MTH Excavator Workshop Manual is aimed at experienced technicians, workshop supervisors, fleet maintenance managers and serious owner-operators who maintain their own machine. It is written for someone who is comfortable with heavy equipment repair and who needs the manufacturer’s procedures and specifications rather than a general guide. If you are rebuilding a travel motor, resealing a control valve, replacing a swing bearing, setting track tension, pulling a pump or overhauling a cylinder on one of these Zaxis models, the relevant procedure and the associated torque and wear limits are in this document.

Why Correct Procedures and Specs Matter

Heavy excavator repair is unforgiving of shortcuts. A travel motor assembled with the wrong preload, a bearing nut tightened to the wrong torque, a floating seal installed without the correct handling, or a cylinder nut left unmushroomed can lead to premature failure, oil leaks, or a component coming apart under load. The manual addresses these points directly: it specifies starting torque for the main pump bearing preload, bearing nut tightening torques for the travel and swing devices, bolt tightening order for multi-bolt flanges, LOCTITE and THREEBOND application points, and the correct method for handling floating seals. It also warns where a component is under spring or hydraulic pressure, such as the track adjuster and the travel device air bleed plug, so the work can be done safely.

The maintenance standards are equally practical. Instead of simply telling you to inspect a part, the manual gives a standard dimension and an allowable limit, and states the remedy — replace, repair and finish, or cladding by welding and finishing. For the track, for example, link length, master pin, master bushing, grouser shoe, bushing and pin dimensions are all tabulated for both the ZAXIS330/330LC/350H/350LCH group and the ZAXIS370MTH. For the lower roller, axle outside diameter, bushing inside diameter and flange thickness are given. This turns inspection into a measurable decision rather than a judgement call.

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Instant PDF Delivery

This Hitachi Zaxis 330 330LC 350H 350LCH 370MTH Excavator Workshop Manual is supplied as a PDF file, available immediately after payment. There is no shipping, no waiting for a disc or a printed binder, and no risk of a lost parcel. You can open it on a workshop PC, a laptop, a tablet or a smartphone, search through it for the component you are working on, and print only the pages you need for the job. A printed copy in the workshop is useful, but having the file on hand means you can reprint a soiled page, zoom into an exploded view, or check a torque value without leaving the machine. For a 752-page manual covering five excavator models across multiple serial number ranges, that convenience is worth as much as the content itself.