Description

Fiat-hitachi EX120-2 Parts Catalog

If you’ve ever ordered a part for an EX120-2 and ended up with the wrong seal because some aftermarket website pulled a number out of thin air, you know the pain. This Fiat-hitachi EX120-2 Parts Catalog is the factory-issued document—465 pages of exploded diagrams, exact part numbers, service codes, and compatibility notes. No guesswork. No third-party shortcuts. You get the same book a dealer’s parts counter uses.

What’s Inside the EX120-2 Parts Catalog

This catalog covers every major assembly on the machine. The table of contents breaks it into: UPPERSTRUCTURE, UNDERCARRIAGE, FRONT-END ATTACHMENTS, RUBBER CRAWLER PARTS, OPTIONAL PARTS, TOOLS AND SPARE PARTS, NAME-PLATE, and a PARTS INDEX. The index at the back sorts parts by number, with “*” marks for newly added items. You’ll find service codes like “H” for precision parts that shouldn’t be field-repaired, “D” for assemblies you must replace as a unit, and “OP” for optional equipment. The manual also explains how to read the compatibility symbols (I, P, T, Y) so you never order a part that won’t fit your machine’s serial number range. If you need the charge pressure for the hydraulic system, page 73? Actually, the catalog focuses on part identification, not torque values, but the compatibility tables on pages 2-3 are worth memorizing.

Why a Factory Parts Catalog Instead of Aftermarket Copies

Aftermarket catalogs often skip the “Interchangeability” column or simplify the service codes. The OEM version tells you whether a part is superseded, prohibited, or requires a supporting kit. For the EX120-2, that’s critical. The crawler undercarriage, for example, uses specific bolt sizes for the sprocket—get it wrong and you’re pulling the final drive again. The rubber crawler parts section lists track chain lengths and pad bolts by grade. Aftermarket reprints routinely drop the machine serial number splits, leading to mismatched final drive housings. Stick with factory data.

3 Reasons to Use OEM Documentation

First, the part numbers are verified against Hitachi’s own engineering drawings—no transcription errors. Second, the compatibility notes (I, P, T, Y) actually work. Third, the “Applicable Serial Number” column lets you order parts built for your exact machine, not a generic range. If you’ve ever had a fuel injector line that was one thread pitch off, you know why this matters. HITACHI EX120-2 Parts Catalog and the companion engine catalog for the Isuzu 4BD1T are the only pair you should trust.

EX120-2 Parts Ordering: Common Mistakes

I see guys order a hydraulic pump repair kit without checking the service code. If the code says “D”, you cannot buy the seal individually—you have to buy the whole pump subassembly. Another mistake: ignoring the “R” code in the adjustment shim column. Those are build-specific, and the quantity varies per machine. The catalog marks “R” parts with a note, but only the factory print includes that. Save yourself the RMA hassle. Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog and Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs are also available if you run other models.

How the EX120-2 Parts Catalog Saves You Downtime

Every hour a machine sits waiting for the right part costs you money. This catalog gives you the correct part number, the supercession history, and the interchangeability conditions. That means you order once. The front-end attachment section, for instance, includes bucket ear dimensions and pin diameters—critical when you’re swapping couplers. The upperstructure chapter covers cab components, electrical brackets, and engine mounts. The undercarriage chapter has rollers, idlers, and track adjusters. The index at the back lists over 2,000 part numbers. You can cross-reference with your machine’s serial number plate—shown in the manual’s name-plate section. Automotive Industry Overview is a general resource, but for the EX120-2, you need this catalog. Automotive Industry Overview

Frequently Asked Questions

Does this parts catalog include engine part numbers?

No. Engine parts for the Isuzu 4BD1T are in a separate catalog. This manual covers everything else: upperstructure, undercarriage, attachments, optional equipment, tools, and spare parts.

Will this PDF work on my tablet in the field?

Yes. The file is a standard PDF with bookmarks. You can zoom into the exploded diagrams. No DRM restrictions. Print the pages you need for greasy hands.

How do I use the compatibility symbols (I, P, T, Y) correctly?

“I” means you can replace the listed part with the alternative part, but not vice versa. “P” means the original part is prohibited—you must use the alternative. “T” requires a combination of multiple parts from the alternative column. “Y” means unconditional interchangeability either way. The catalog gives examples on page 3. Ignoring these will get you a box of wrong parts.

Can I order parts directly from this manual?

The manual is for identification only. You need to contact your local distributor with the part number, machine model, serial number, and quantity as shown in the foreword.

You’ve seen what happens when you rely on aftermarket catalogs or generic part lists. The EX120-2 is a workhorse, and it deserves factory-correct parts. Access the Factory Manual now and keep your excavator running without the headache of mismatched components.