Description

Fiat-hitachi EX300, EX300LC, EX300H, EX300LCH Parts Catalog – 164 Pages of Factory Specs

If you’ve ever ordered a hydraulic seal kit for a Fiat-hitachi EX300 series machine and got the wrong size, you know the pain. The parts counter guesses. The aftermarket sites show a generic picture. Then you’re staring at a disassembled Fiat-hitachi EX300, EX300LC, EX300H, EX300LCH Parts Catalog that tells you exactly which O-ring goes where. That’s what this 164-page document does. It’s the same book the dealer pulls up when you give them a serial number. No translation errors, no third-party reprints. Straight from Hitachi’s printing office.

Pump and Motor Systems – Factory Breakdown

The catalog opens with the pump section. You get exploded views of the main hydraulic pump, complete with part numbers for every piston, swashplate, and bearing. The motor section follows, covering both travel and swing motors. Each assembly is tagged with a reference number that links directly to the parts index. Need the charge pressure relief valve cartridge? Page 73. The torque spec? Not in this book – that’s in the service manual. But the part number is right there, and you can order it without disassembling the whole motor to read the stamp. That alone saves an afternoon.

Valve and Cylinder Assemblies: Page-by-Page Reference

Valve stacks are where most shops lose time. The pilot control valve, main control valve, and solenoid valves are all broken down into individual components. The Valve section shows the spools, springs, and plugs with callouts. Next to that, the Cylinder section – boom, arm, bucket, and any attachments – lists the piston, rod, gland, and seal package. Every cylinder assembly has a service code column that tells you if a part is oversized (OS) or undersized (US). If your machine has had a cylinder re-sleeved, you need those codes. The manual flags them in the compatibility notes on page 4 of the foreword.

Is This Parts Catalog for You?

You’re working on a job site or your own excavation project. You have an EX300, EX300LC, EX300H, or EX300LCH. You need to find a replacement pump cartridge or a seal kit for a cylinder. This catalog is the only source that matches factory specifications. It’s not a repair manual – it won’t tell you how to rebuild a valve. But it will tell you exactly which parts belong in that valve, with serial number ranges (02001~) and interchangeability symbols (I, P, T, Y).

164 Pages of OEM Data – No Aftermarket Copy

The DOC file we sell is a direct scan of the original Hitachi publication (P159-E1-7). The foreword starts with the Japanese and English text. The parts index at the end sorts everything numerically. Aftermarket parts catalogs often re-index numbers, cross-reference incorrectly, or omit the “D” and “H” prefix codes that indicate production changes. This one keeps them all. The table of contents lists: PUMP, MOTOR ; OIL, VALVE, CYLINDER, PARTS INDEX. That’s the structure. No fluff, no extra sections.

How to Order Parts Using This Catalog

You need four things from the machine: model, serial number (the -XXXX part), the part number from the book, and quantity. The foreword gives an example – EX300, 159-02001, A810165, O-ring, qty 2. The catalog uses a dot system for assemblies: one dot means component of an assembly, two dots means component of a sub-assembly. If you see a part with a “W” in the service code, you need local machining. If it says “K”, it’s part of a service kit. If you ignore that, you might order a single seal that isn’t sold alone. This catalog stops that.

Related manuals you might need:
HITACHI EX300 Series Excavator Parts Catalog
Fiat-hitachi EX300 Parts Catalog – 465-Page OEM Excavator Parts Reference
Fiat-Hitachi EX300 Series Technical Manual – 852 Pages OEM

External references: Automotive Industry Overview – though this is construction equipment, the principles of using OEM documentation apply. Automotive Industry Overview

Does this catalog list torque specifications for bolts?

No. This is a parts catalog, not a service manual.

What serial numbers does this catalog cover?

From serial number 02001 onward. The inside cover states “適用号機 02001~” which means applicable for machine numbers starting at 02001. If your machine is older, check the back pages for updates.

Can I use this catalog to order parts for an EX400 or other model?

Only the EX300, EX300LC, EX300H, and EX300LCH are covered. Other models have different part numbers even if components look identical.

How do I interpret the interchangeability symbols in the compatibility column?

The chart on page 4 explains: I means one-way interchangeable (new part replaces old, but not vice versa), P means the old part is prohibited – use the new one, T means use a set of parts together, Y means full interchangeability. If you see an asterisk (*) next to a part number, that part is newly added in this printing.

The bottom line: if you’re buying parts for a Fiat-hitachi EX300 series excavator, this is the book that keeps your parts order from turning into a backorder. Access the Factory Manual and keep it on your tablet or print the pages you need for the job. It’s 164 pages of factory specifications – nothing less.