Description

Fiat-hitachi EX300-2, EX300LC-2, EX300H-2, EX300LCH-2 Parts Catalog

You’ve got a Fiat-hitachi excavator in the bay – maybe an EX300-2, maybe an LC or H variant. You need a lower roller or a swing motor seal, and the parts counter wants a serial number and a part number you don’t have. That’s why this Fiat-hitachi EX300-2, EX300LC-2, EX300H-2, EX300LCH-2 Parts Catalog exists. 396 pages of factory-issued breakdowns, not some third-party reprint that blurs the bolt callouts. I’ve been wrenching since before OBD-II was a thing, and I can tell you the difference between OEM documentation and aftermarket junk is the difference between a job that stays together and a callback.

This is the same binder the dealer’s parts department uses. Every illustration, every part number, every service code – it’s all here. You don’t need to wonder if a seal is the right size or if the pin bushing was updated mid-year. The manual tells you exactly which machine each part fits, using the serial-number split points marked in the service code columns. Page 5 explains the service codes: W for field work, H for precision parts, D for assemblies you don’t break apart, K for service kits, and so on. That alone saves you ordering a $400 complete group when all you needed was a $6 O-ring.

Upperstructure: Swing Gear, Main Pump, and Hydraulic Plumbing

The UPPERSTRUCTURE section covers everything above the track frame: the swing motor, the main control valve, the cab components, and the hydraulic tank. If you’ve ever tried to match a swing bearing bolt pattern without a factory diagram, you know the pain. This manual gives you exploded views with callouts keyed to a parts list that includes the exact fastener grade and length. For the EX300H-2 model with the heavy-duty undercarriage, there are separate illustrations for the reinforced swing bracket. The service code column will flag if a part is serial-number-specific. Using the Parts Index at the back (page 396 and earlier), you can cross-reference a part number fast. No guessing.

Undercarriage: Track Frame, Final Drive, and Idler Tension

The UNDERCARRIAGE section is where a lot of DIY guys get burned. Track chains, sprockets, idlers, and final drive gears – if you buy aftermarket, you’re rolling the dice on metallurgy. This catalog shows the OEM part numbers for the EX300-2 standard track and the EX300LC-2 long track. You’ll see separate line items for the LC model’s wider track shoes and longer chain pitch. Page numbers are listed in the table of contents, so you can jump straight to the track roller cluster without flipping through the whole book. The NAME-PLATE section tells you exactly where to find your machine’s serial plate to match the correct variant. Don’t eyeball it – use the factory splits.

Front-End Attachments: Boom, Arm, Bucket Linkage

FRONT-END ATTACHMENTS covers the boom, arm, bucket, and all the pins, bushings, and seals. If you’re repinning an EX300-2 or swapping a bucket linkage on an EX300LCH-2, you need the exact pin diameter and bushing part number. The manual lists shims and retaining hardware as separate line items, with service codes indicating whether a part is oversize (OS) or undersize (US). That’s standard in a factory book. The TOOLS AND SPARE PARTS section includes the special service tools – pullers, sleeves, and adapters – required to disassemble the boom foot without damaging the seal surface. Try getting that from a third-party PDF.

Optional Parts and Service Kits – When the Machine Isn’t Standard

OPTIONAL PARTS covers auxiliary hydraulic lines, thumb kits, quick couplers, and cold-weather options. The manual marks optional parts with OP in the service code column. If your machine came with a factory-installed thumb or a cab guard, you’ll find the specific brackets and hoses here. The K code indicates service parts kits – for example, a seal kit for the main pump that includes all the O-rings and back-up rings. Ordering by kit number saves you from sourcing each seal individually. The H code warns you that the part is precision-matched and shouldn’t be disassembled in the field. Obey that code – I’ve seen guys ruin a $2,000 rotary joint because they ignored it.

Source Validity – OEM vs Aftermarket Documentation

This is not a scanned reprint of a manual that was already copied from a photocopy. It’s the original factory PDF, the same one Hitachi distributed to dealerships. The foreword (page 4) explains how to order parts, including the machine model, serial number, and part number. It also notes that engine components are in a separate Isuzu 6SD1-T parts catalog – that’s transparency you don’t get from a generic “fits all” manual. The Japanese and English text appear side by side, so you can verify part names in both languages. For a shop that deals with imported equipment, that’s a time-saver. Related manuals like HITACHI EX300-2 EX300LC-2 EX300H-2 EX300LCH-2 Parts Catalog are available for other models in the same family. If you work on the 800-series, check Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog. For a compact machine, Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs has the same level of detail.

FAQ

Does this manual include engine parts like pistons, rings, or injectors?

No. The manual explicitly says engine parts are in a separate Isuzu 6SD1-T catalog. You need that book for anything inside the block.

How do I know which variant (EX300-2 vs EX300LC-2) my machine is, and which parts apply?

Check the name plate on the main frame near the cab. The manual covers four models: EX300-2 (standard track), EX300LC-2 (long track), EX300H-2 (heavy-duty undercarriage), and EX300LCH-2 (combination). In the parts list, a notation like “(Standard Track)” after the part name means it fits EX300-2 and EX300H-2 only. “(LC Track)” means EX300LC-2 and EX300LCH-2. No notation means the part fits all four. The serial number breakpoints are given in the service code column – look for “D” dates or “H” serial numbers. Cross-reference your machine’s serial against the table on page 2 of the manual (the memorandum page) where you can record your engine type and machine serial. That page is blank in the PDF so you can fill it in. Use it.

If you’ve spent an hour chasing a part number that doesn’t cross, you understand why factory documentation matters. This is the same book a dealer tech pulls off the shelf. Get the right data the first time. Access the Factory Manual and keep it in your tablet or print the pages you need for each job. You’ll stop ordering wrong parts. If you want more context on why OEM specs matter in the Automotive Industry Overview, you can read the history. But the practical side is this: 396 pages of verified part numbers beats any aftermarket source hands down. Automotive Industry Overview – same principle applies to heavy equipment.