Description

Fiat-hitachi EX400-5, EX450H-5 Parts Catalog

Look, I’ve been turning wrenches for 28 years. When a customer brings in an EX400-5 or EX450H-5 with a blown hydraulic line or a seized pump, the last thing I want is to guess the part number. That’s when you grab the factory parts catalog – not a reprint, not a third-party compilation. This is Hitachi’s own documentation, 418 pages of exploded diagrams and OEM part numbers. If you’re responsible for keeping one of these machines running, you need this on your desk or tablet, not a PDF from some forum. The catalog is divided into three main sections: UPPERSTRUCTURE, UNDERCARRIAGE, and BACKHOE ATTACHMENTS. Each section is further broken down into subsystems. Under UPPERSTRUCTURE, you’ll find the engine, radiator, air cleaner, muffler, fuel piping, fuel tank, fuel double filter, pump device, swing device, oil tank, all hydraulic piping, control levers, pilot valves, consoles, electric parts, cab, and more. That’s over 60 subsections just for the upperstructure. The UNDERCARRIAGE section covers track frame, travel device, idler, adjuster, rollers, and track links in multiple gauges. The BACKHOE ATTACHMENTS section lists booms (standard, long, HD), arms (standard, short, semi-long, long, HD), buckets (JIS 94 sizes from 1.15 to 2.3 cubic meters), ripper bucket, one-point ripper, and all front piping and lubricate piping. Every part number is Hitachi OEM, not aftermarket. That means when you order part A810165 from your dealer, it will fit. That’s the difference.

Engine Section: What the Catalog Shows

The engine section in this catalog covers the complete powerplant, from the block to the accessory drives. You get exploded views showing every bolt, gasket, and seal. Part numbers are listed alongside quantities and descriptions. This is Hitachi’s own numbering system – no guessing if a part will fit. The ENGINE subsection under UPPERSTRUCTURE is where you’ll find it. Combined with the FUEL PIPING and FUEL DOUBLE FILTER sections, you can order any component for the fuel system without cross-referencing aftermarket books.

Skip the guesswork.

Fuel System: Piping, Tank, and Filters

Fuel components are broken down in the FUEL PIPING, FUEL TANK, and FUEL DOUBLE FILTER sections. If you need a new fuel line, check the piping diagrams. The tank section includes the cap, sender, and mounting brackets. Each part has a unique OEM number. The manual also covers the FUEL TANK, RESERVE TANK, and AIR CLEANER – all part of the intake and fuel delivery system. For the EX450H-5, cold district variants are marked with <450H> on the page header. Pay attention to those designations when ordering.

3 Reasons to Use OEM Parts Catalogs

First, accuracy. Aftermarket parts books often combine models or use generic photos. This catalog is model-specific for EX400-5 and EX450H-5, including cold district variants. Second, completeness. Every hydraulic line, every electrical part, every cab trim piece is listed. Third, traceability. The parts index at the end lets you look up any number. For other Fiat-hitachi models, check the Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog for a different size class. Or if you need something smaller, the Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs might be more suited.

Can You Use This for the Undercarriage?

Yes. The UNDERCARRIAGE section covers track frame, travel device, front idler, adjuster, rollers, and track links. You’ll find separate listings for 600G, 700G, and 750G track links. If you’re replacing an upper roller on your EX400-5, you need the specific part number – this catalog delivers. The TRAVEL DEVICE and CENTER JOINT subsections are also there. If you’ve ever ordered the wrong travel motor seal because of a misread aftermarket diagram, you’ll appreciate having the factory illustration.

Get the Right Part Number from the Index

At the back of the manual, the PARTS INDEX lists every part number alphabetically. Use it when you only have a part number, or need to cross-reference. The index shows which page and section the part appears on. No more flipping through every page. The manual also includes a NAME-PLATE section with Russian translations for international machines – handy if you’re working on an exported unit. For general background on equipment manufacturing, see Automotive Industry Overview. You can also check Automotive Industry Overview for context on production standards.

Does this manual include torque specs or repair instructions?

No. This is a parts catalog only – no torque values, no repair steps.

How do I find the part number for a fuel pump?

Open the UPPERSTRUCTURE section and locate the FUEL DOUBLE FILTER or PUMP DEVICE (1) or (2) subsection depending on your machine. The exploded diagram will have item numbers. Cross-reference with the parts list below the diagram. The part numbers are listed in the table with quantities. If your machine has a cold district variant, check the note at the top of the page for <400> or <450H> designations. For the exact fuel pump, you’ll need to know your machine serial number (stamped on the main frame under the cab) and whether it’s an EX400-5 or EX450H-5. The manual’s preface explains these markings. Use the PARTS INDEX at the end to look up the part number directly if you have the numbers.

If you maintain these excavators, stop working with cross-references and copied diagrams. Access the Factory Manual – it’s the only way to guarantee you order the right part the first time.