Description

Fiat-hitachi EX300-3, EX300LC-3, EX300H-3, EX300LCH-3 Parts Catalog – 468 Pages of Factory Specs

Ordering a hydraulic line for a Fiat-hitachi EX300-3 and getting the wrong length wastes a day and a half of billable hours. I see it every week. Guys grab an aftermarket parts list off some forum, punch in a number that looks close, and end up with a boom cylinder seal that doesn’t fit the EX300LC-3. That stops here. This Parts Catalog is the exact same book a dealer parts counter uses. 468 pages of exploded views, factory part numbers, and compatibility tables. No guessing.

What This 468-Page Parts Catalog Covers

The table of contents splits the machine into eight logical groups: UPPERSTRUCTURE, UNDERCARRIAGE, FRONT-END ATTACHMENTS, RIVER MAINTENANCE FRONT, OPTIONAL PARTS, TOOLS AND SPARE PARTS, NAME-PLATE, and a PARTS INDEX. Each section contains every nut, seal, hose, and bracket for the four model variants – EX300-3, EX300LC-3, EX300H-3, and EX300LCH-3. The River Maintenance Front chapter is specific to dredging attachments; if your machine has one, you won’t find that data anywhere else in a single document. The engine components are covered in a separate isuzu manual, but the catalog calls that out clearly on page 3. Every part number ties back to a serial number range, so you order exactly what was bolted on at the factory.

UPPERSTRUCTURE, UNDERCARRIAGE, and More: Chapter Breakdown

Flip to the UPPERSTRUCTURE chapter. You get swing gear, pilot system, cab trim, control valves – all with callouts tied to the part number index. The UNDERCARRIAGE section is where most mistakes happen: track rollers, sprockets, idlers, and final drive seals. The catalog shows which side frame components are shared between standard track (EX300-3 and EX300H-3) and long track (EX300LC-3 and EX300LCH-3). Look for the notation “” or “” next to the item name. That alone saves you from ordering a travel motor that has the wrong flange bolt pattern. The FRONT-END ATTACHMENTS chapter covers boom, arm, bucket linkage, and quick couplers. If you are swapping an arm from a LC model onto a standard machine, the compatibility notes in the catalog tell you exactly which pins and bushings change. OPTIONAL PARTS includes cab guards, extra counterweights, and hydraulic quick-coupler kits – all with factory numbers, not aftermarket cross-references that may or may not fit.

How to Read the Factory Parts Numbering System

Page 4 explains the service codes. “W” means field modification required – call your dealer before ordering. “D” means the part is only sold as an assembly – no individual seals. “Z” marks engine-related parts (refer to the isuzu manual). The compatibility column uses “I” (can replace but not be replaced), “P” (obsolete, use substitute part listed), “T” (must use as set), and “Y” (fully interchangeable). If you see “D94/03” in the serial number column, that part superseded in March 1994. This level of detail does not exist in aftermarket catalogs. Those generic books lump all model years together and hide serial number breaks under vague footnotes. You will waste time chasing parts that don’t exist. Use the OEM book. As noted in the Automotive Industry Overview, proper documentation reduces assembly errors; the same applies to parts identification.

Does the Catalog Cover Engine Components?

No. The engine – an isuzu 6SD1-T – has its own separate parts catalog. This Fiat-hitachi manual refers you to that book on page 3 under the notes. Trying to order a piston ring or injector from this catalog will leave you empty-handed. The manual covers everything from the bellhousing forward: pumps, drive couplers, hydraulic lines, and mounting brackets. If you need engine internals, grab the matching isuzu manual. See the related Fiat-hitachi EX300-3 Series 1994 Operators Manual – OEM for maintenance schedules and fluid capacities that complement this parts catalog.

Why You Need the OEM Catalog Over Aftermarket Copies

Aftermarket parts catalogs reprint the same exploded views but strip out the serial number breaks, service code notes, and compatibility tables. I have seen a reprint that listed an EX300-3 hydraulic filter element that physically fits but bypasses at the wrong pressure – because the aftermarket book ignored the “D” code meaning the filter is only sold as part of a larger assembly. The OEM catalog costs less than one misordered hose. For comparative reference, check the Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog if you run a larger machine in the same fleet. The documentation structure is identical, so you do not need to re-learn the numbering system. Additionally, the HITACHI EX300-3 Series Parts Catalog is the exact file you are viewing – verified against factory microfiche.

Using the Compatibility and Service Code Tables

When you open the catalog, the first thing you see is the model applicability matrix. Each part number has a “Applicable Serial No.” column. If your machine serial number is 15L-07001, you fall into the range shown on page 1. The “Service Code” column tells you whether a part is a dealer-only item (H for precision components), shim (R – quantity varies per machine), or optional (OP). Ignoring these codes leads to stripped threads or hydraulic leaks. For a real-world example: the swing motor seal kit is marked “D” – you must order the entire swing motor assembly. The parts index at the back lists every number in numeric order, with page references. That is how you verify a number before calling the dealer. This is not a PDF you scroll through once; it is a reference you keep on the workbench next to the factory service manual. The industry standard for documentation quality is summarized in the Automotive Industry Overview – and this catalog meets it.

Can I use this catalog for the EX300H-3 or EX300LCH-3?

Yes.

How do I find the correct part number when there are multiple entries for the same item?

Start by locating your machine’s serial number on the nameplate (right side of cab, main frame). Then look for the applicable serial number column in the catalog. If the part has a compatibility code (like P or T), you must follow the substitute part or set requirement. For example, a hydraulic pump might have two versions: one before serial number 15L-10000 and one after. The catalog shows the exact serial break. Once you have the correct part number, verify it in the parts index to confirm the page and assembly it belongs to. That process eliminates errors. Do not skip the service code column: a part marked “H” means do not disassemble – replace as a unit. If the code is “D”, you cannot buy the seal separately; you buy the whole assembly. This is the difference between ordering once and ordering three times.

Access the Factory Manual and keep it on your tablet or printed out. It has 468 pages. You will use it every time you open a parts box.