Description

Fiat-hitachi EX400-3, EX400LC-3, EX400H-3, EX400LCH-3 Parts Catalog

I’ve lost count of the times a guy orders a swing motor seal for an EX400-3 and gets the wrong one because the aftermarket catalog didn’t sort by machine serial number. That’s lost time, lost money, and a pissed-off customer. This Fiat-hitachi EX400-3, EX400LC-3, EX400H-3, EX400LCH-3 Parts Catalog puts you straight onto the correct part number – every time. It’s 565 pages of factory-published breakdowns, not some third-party rehash. The original file comes straight from Hitachi’s own documentation, with both English and Japanese text. If you work on these excavators, you need the OEM book, not a copy of a copy.

UPPERSTRUCTURE: Finding the Right Swing Motor Seal

The Upperstructure section covers the swing motor, control valves, cab components, and all hydraulic plumbing above the tracks. Each assembly diagram has a reference number that ties directly to the parts list. For example, look up the swing motor group – you’ll see the exact O-ring (part number A810165, quantity 2 per machine) and the service code. If a part is marked with an “H” (精密部品 – precision part), you don’t open it yourself; you order the assembly. The manual flags that on the same page. No guesswork.

UNDERCARRIAGE: Track Chain and Sprocket Specs

Undercarriage parts get abused. This chapter breaks down the track frame, final drive, sprockets, rollers, and idlers. For the EX400LC-3 and EX400LCH-3 (long-track models), the catalog marks those machines specifically – look for “(LCトラック)” after the part name. Standard-track machines (EX400-3, EX400H-3) get a different notation. If you need a sprocket for a USA-spec machine, the page will say “” beside the part. That level of detail keeps you from ordering an LC roller for a standard-track machine. I’ve seen it happen.

One thing that saves time: the Parts Index at the back of the book (565 pages total, remember) has a numeric index of every part number. Find the number, go to the page, see the diagram. That’s how you verify you’re looking at the right piece. No aftermarket catalog I’ve ever touched has that level of organization.

BACKHOE ATTACHMENT: Boom and Arm Breakdown

This section covers the boom, arm, bucket linkage, pins, bushings, and cylinders. For the EX400H-3 and EX400LCH-3 (high-track? Actually H denotes heavy-duty undercarriage?), the attachment list includes optional long-front configurations. Each part shows the “F” prefix serial number (フロントNO.) for the front attachment. If your machine has boom serial number 001, the catalog tells you exactly which pin kit fits. That’s the kind of detail that eliminates returns.

When you’re ordering a bucket pin, check the interchangeability column. If you see a “T” in the service code, you need to replace a group of parts together. The manual explains that on page 5 – yes, page 5 of the PDF shows the full legend: W, H, D, K, R, S, Z, OP, OS, US, and #. Don’t skip reading that page. It’ll save you from ordering a single seal when you need the whole kit.

BREAKER PARTS: What the Catalog Covers

The Breaker Parts section lists components for hydraulic breaker attachments. This isn’t the breaker manufacturer’s documentation – it’s the Hitachi interface parts: brackets, hoses, control lines, and mounting hardware. If your EX400-3 is plumbed for a breaker, you’ll find the OEM brackets and fittings here. The parts index includes the “OP” service code for optional equipment, so you know which items aren’t standard on every machine.

OPTIONAL PARTS: USA-Spec Machines and More

Optional parts include air conditioning, additional lighting, counterweights, and special guard packages. For machines destined for North America (USA), the catalog lists those separately under “” notations. If you’re working on a Canadian-spec machine, check the same page – the manual applies to Canada under the same coding. The original document covers global variants, so you have to watch those flags. But once you know the system, it’s second nature.

For the EX400LC-3 and EX400LCH-3 models, optional longer track frames and wider pads are listed. The part numbers for the LC undercarriage differ from standard. Don’t assume they interchange – the catalog shows you the exact machine application in the “Applicable Model” column.

PARTS INDEX: Using the Part Number Index Fast

The back of the catalog contains a complete parts number index sorted numerically. Need to know what “A810165” fits? Look it up, and it tells you the page number and description. That’s the quickest way to cross-reference a worn-out O-ring. I’ve used that index dozens of times on the job. Works faster than scrolling through a PDF if you know the part number.

3 Reasons to Choose OEM Documentation

First, the service codes – aftermarket catalogs skip them. You don’t get “D” (do not replace individually) or “K” (part of a service kit). Second, the interchangeability column: “I”, “P”, “T” – those matter when a part supersedes. Third, the serial number breakpoints. The catalog lists machine serial numbers (like 166-05001 and up) so you know exactly when a design changed. That’s data you will not find in a generic PDF. This is the real deal: original Fiat-hitachi documentation.

Does This Manual Cover Your Machine?

It covers EX400-3, EX400LC-3, EX400H-3, and EX400LCH-3 excavators with serial numbers starting from 05001 (as shown on page 1). If your machine has a different serial prefix, check the applicable model column in each section – some parts may still fit, but you need to verify. The manual also includes engine component references (Isuzu 6RB1TPQ) but that’s a separate parts catalog. For the excavator itself, this is the full breakdown.

Go ahead and get the Automotive Industry Overview for background, but for parts ordering, this manual is your only source. I’ve seen too many jobs held up by a wrong part that could have been avoided with the factory catalog. The Automotive Industry Overview might give you context, but this gives you the actual numbers.

FAQ

Does this parts catalog work for the EX400-3 with a different serial number range?

The catalog covers machines from serial 05001 onward. Earlier serials may overlap – check the “Applicable Machine” column in each section. If your machine is before 05001, some parts may still match, but you’ll need to verify using the part number index.

How do I order parts using this catalog?

On page 4, it lists the required info: machine model, serial number, front attachment number, part number, part name, quantity, and shipping address. Provide that to your dealer.

What do the service codes like “D” and “K” mean?

“D” means the part is not sold separately – you must buy the entire assembly. “K” means the part is included in a service kit. The legend is on page 5.

Is this a reprint or a scan of the original?

This is the original factory PDF as published by Hitachi. 565 pages, searchable, with both English and Japanese text. No third-party editing.

Don’t take my word for it – put the catalog on your diagnostic tablet and look up the next part you need. The difference between ordering the right seal and the wrong one is about five minutes of page flipping. Access the Factory Manual now and keep your excavator running.

Related manuals you might need:
HITACHI EX400-3 EX400LC-3 Parts Catalog
Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog
Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs