Description

Fiat-hitachi EX300, EX300LC, EX300H, EX300LCH Parts Catalog

You’ve got a Fiat-hitachi EX300 on the hook and the parts manual you’re using came from a photocopier in the break room. One wrong part number and you’re eating the cost of a return shipment and two days of downtime. I’ve seen mechanics order the wrong swivel joint because a third-party catalog listed the same number for both standard-track and LC-track undercarriages. That mistake runs about 700 bucks before labor. The Fiat-hitachi EX300, EX300LC, EX300H, EX300LCH Parts Catalog from AutoRepairManuals is the same binder the dealer’s parts counter uses—factory-original, 393 pages, no translations from a PDF that lost its formatting.

Parts Breakdown for the EX300 Series

This catalog splits the machine into six main groups: UPPERSTRUCTURE, UNDERCARRIAGE, FRONT-END ATTACHMENT, OPTIONAL PARTS, TOOLS AND SPARE PARTS, and the NAME-PLATE section. Each group contains exploded-view diagrams with callout numbers that match the parts list. The FRONT-END ATTACHMENT section, for instance, shows boom, arm, and bucket linkages with every bushing seal and pin listed individually. You won’t find generic “arm assembly” entries—you get the exact part number for the pin retainer on the left-side bucket ear. That level of detail means you order what actually fits, not what the counter guy guesses.

393 Pages of Factory Part Numbers

Every page in this catalog was printed from HITACHI’s original files. The OCR excerpt shows the Japanese text and English headings, but the numbers are what matter. The PARTS INDEX at the back is sorted numerically so you can cross-reference a part you pulled off the machine against the diagram. If the number starts with “A81” it’s a hydraulic component—most of the swivel and valve parts fall into that range. The manual also includes service codes like “W” (requires local modification), “H” (precision part – do not disassemble), and “K” (part of a service kit). Ignore those codes and you’ll end up with a part that can’t be installed without a machining step you didn’t plan for.

How Does This Manual Handle Machine Variants?

Fiat-hitachi built the EX300 in four track configurations: standard-track (EX300, EX300H) and long-track (EX300LC, EX300LCH). The catalog labels every part entry with a track designation. A part listed as “XXX (スタンダードトラック)” fits EX300 and EX300H only. “XXX (LC トラック)” fits EX300LC and EX300LCH. If the part has no suffix, it’s common to all four. The same logic applies to regional options: SDX for overseas, DX for domestic export, no mark for standard Japan. Check the top of the page before you order—it saves a return trip to the supplier.

Upperstructure Section: What You’ll Find

The UPPERSTRUCTURE chapter covers the cab, engine enclosure, hydraulic tank, pump assembly, and control valves. Each subassembly breaks down into the individual seals, O-rings, gaskets, and fasteners. For example, the swing motor page lists the brake piston O-ring part number separately from the drive gear seal kit. If you’re rebuilding the swing brake, you can order the exact O-ring (maybe A81-0165) instead of buying a whole replacement motor. The catalog also notes compatibility codes: “Y” means the listed part can replace the original without restriction; “P” means the original part is prohibited and you must use the replacement shown. That kind of data keeps you from installing a superseded part that blocks a service port.

Use the Parts Index to Cross-Reference

When you’ve got a part in hand with a number you can read, turn to the PARTS INDEX at the end of the manual. It’s sorted by part number and points you to the exact page and figure callout. The index also flags newly added parts with an asterisk (*). That’s useful when a machine has been updated in the field and the original part has been superseded. The index will show the new number alongside the old one. Don’t skip this section—it’s the fastest way to confirm you’re ordering the latest revision.

Why Trust a Factory Parts Catalog?

Aftermarket parts catalogs often combine multiple machine series into one generic layout, leaving out the crucial variant notes. I’ve seen a “compatible” catalog list a swing motor seal kit that fits EX300 but not EX300LC because the brake piston diameter differs by 2 mm. The factory catalog catches that because HITACHI engineers wrote the compatibility codes into the data from the start. Every page in this 393-page document traces back to the original engineering release. That’s the difference between ordering parts once and ordering them twice.

Related Manuals You Might Need:

• HITACHI EX300 Series Parts Catalog
• Fiat-hitachi EX300 Parts Catalog – 465-Page OEM Excavator Parts Reference
• Fiat-Hitachi EX300 Series Technical Manual – 852 Pages OEM

For broader context on heavy equipment documentation standards, see this Automotive Industry Overview and this Automotive Industry Overview.

Does this catalog cover the EX300H and EX300LCH?

Yes, all four models (EX300, EX300LC, EX300H, EX300LCH) are included. Variant-specific parts are marked in the parts list and on the exploded views.

Are the part numbers the same for standard-track and long-track machines?

Some are common, some are not. The catalog uses suffixes like “(スタンダードトラック)” and “(LC トラック)” to separate them. Always check the top of the page for the machine designation before ordering.

How do I read the compatibility codes (I, P, T, Y)?

I means the part can be replaced by the alternative but not the reverse. P – original part is prohibited, use the listed substitute. T – use the group of parts listed together. Y – fully interchangeable both ways. The manual explains this on page 3. If you ignore these codes, you may order a part that doesn’t fit or that supersedes a critical service item.

Is the manual in English?

It’s bilingual English and Japanese. The exploded views and part-number tables are language-independent. The foreword and service-code explanations appear in both languages, so you can read the notes in English.

If you’re ordering parts for a Fiat-hitachi EX300-series excavator, using anything other than the original factory catalog is a gamble with your time and budget. This 393-page parts catalog puts the same data on your bench that a dealer uses. Access the Factory Manual now and start ordering parts that actually fit.