Description

Hitachi Sumitomo 450-3, 450LC-3, 470H-3, 470LCH-3, 500LC-3 Parts Catalog

You need parts for a Hitachi Sumitomo 450-3, 450LC-3, 470H-3, 470LCH-3, or 500LC-3 excavator. That means you need the factory parts catalog – not some third-party reprint that blurs lines and omits critical interchange codes. This is the real thing: 429 pages of OEM Hitachi Sumitomo documentation, scanned from the original binder. Every part number, every bolt, every seal is listed the way the factory intended.

I’ve been wrenching on heavy iron for 28 years. Nothing burns my lunch like ordering a seal kit that doesn’t fit because somebody used a generic cross-reference. This catalog stops that cold. It covers everything from the frame and counterweight down to the track adjuster and travel device. You’ll find the exact part numbers for the Engine support, Fuel tank, fuel piping, pump drain piping, and the entire hydraulic system – pilot piping, main piping, swing device, and control valve.

3 Reasons to Trust OEM Parts Catalogs

Aftermarket catalogs often skip the fine print – the notes about supercessions, the changeover dates, the region-specific parts. This Hitachi Sumitomo catalog includes the full legends: Y for unconditional interchange, I for one-way substitution, P for prohibited (use the substitute listed), D for changeover date, and more. Those symbols save you from ordering a part that the factory already phased out. Page 3 of the catalog explains every code. You don’t guess; you read the symbol and pick the correct part.

Pull up the Engine section, for example. It lists the engine support, oil filter piping, side branch piping, and pump drain piping – all with factory part numbers. If you need a fuel feed pump or the fuel cooler, those sections are right there. The catalog even tells you which models each part applies to, using tags like <450> for the 450-3, <470H> for the 470H-3, or [NA] for North American spec machines. That level of detail is what makes this a real workbench tool, not a coffee-table book.

Undercarriage and Track Components

The undercarriage section alone covers track frames for the 450, 470H, and 500LC variants, track side steps, track guards, full-length guards, travel devices, front idlers, adjusters, upper and lower rollers, and track links. Each sub-section is broken out by model – for instance, <450,470H> and <450LC,470LCH> and <500LC,520LCH>. If you’re rebuilding a track frame, you need the right front idler bracket for your specific model. This catalog gives you that. No more cross-referencing between generic drawings.

When you order a part, you also get the quantity per machine. The catalog shows ‘1 set’ quantities for assemblies and individual counts for loose parts. That matters when you’re trying to figure out how many track bolts you need for a full undercarriage job. No guesswork.

Front-End Attachments: Booms, Arms, Buckets

Front-end attachments – standard boom 7.0m, H boom 7.0m, boom parts, standard arm 3.4m, semi-long arm 3.9m, H arm 3.4m, buckets 1.9m³ and 2.1m³, rock bucket – all are broken out with individual part numbers. The catalog even separates the bucket options by JIS 94 standard and side-bar type for the rock bucket. If you need a pin or bushing for the boom foot, you find it under BOOM PARTS. No flipping through vague diagrams.

Electrical system? Covered. Control unit, monitor, radio options (Japan, NA, EU), main controller, engine stop switch, GPS parts, rear camera. The catalog lists every connector and bracket. And if you’re dealing with pilot piping, there are ten separate sub-sections (PILOT PIPING 1 through 10) that map out every hose run from the pump to the oil tank to the control valve. You can trace a leak path without touching the machine.

What Do the Symbols Y, I, P, T Mean?

Flip to page 3. The Japanese and English foreword explains every service code and compatibility symbol. Y means the part is unconditionally interchangeable – you can swap without checking date codes. I means you can use the substitute part in place of the original, but not the reverse. P means the original part is prohibited – you must use the substitute listed. T means the part is interchangeable only as a set. D marks the changeover date (e.g., D03/09 for September 2003). These codes appear in the Compatibility column next to each part number. Ignore them at your own risk.

One thing I appreciate: the catalog includes a MEMORANDUM page where you can fill in the Product Identification Number, engine type (Isuzu AH‑6WG1XYSA‑01), and engine serial number. That’s where you record which specific machine this catalog applies to – a simple habit that saves headaches when you have multiple units in the yard.

If you need the full workshop procedures for these machines – disassembly, assembly, torque specs, and diagnostics – pair this parts catalog with the HITACHI ZAXIS 450-3 500LC-3 Workshop Manual. For a different model year, see the Hitachi ZAXIS 450LC-3 470LCH-3 2007 Parts Catalog. And for a similar reference to the 450-3 series with alternative attachments, check the HITACHI ZAXIS 450-3 470H-3 500LC-3 Parts Catalog.

For broader context on why factory documentation matters in the heavy equipment industry, read the Automotive Industry Overview on Wikipedia. The same principles of traceability and standardization apply. The Automotive Industry Overview also explains how OEMs maintain part continuity across model years – exactly what this catalog codifies for the 450‑3 series.

FAQ

Does this catalog include part numbers for the engine itself?

No. Engine parts (pistons, rings, injectors) are in a separate engine parts catalog. This catalog covers engine support, oil filter piping, and side branch piping, but not internal engine components.

How do I read the interchangeability codes like Y, I, P?

These codes appear in the Compatibility column next to each part number. Y means the part is fully interchangeable regardless of serial number break. I means you can substitute the listed part in place of the original, but you cannot reverse the substitution – the new part replaces the old, not the other way. P means the original part is prohibited; you must use the substitute part shown in the substitute column. T means the part is interchangeable only as a complete set or combination. D indicates a changeover date – for example D03/09 means use the part from September 2003 onward. These codes prevent you from installing a part that has been superseded or discontinued.

What does the ‘D’ symbol mean?

D indicates the changeover date expressed as year/month. For example, D03/09 means that from September 2003 onward, the newer part supersedes the older one. If your machine was built after that date, order the later part.

Is this catalog for North American machines?

Yes. The serial number range starts at 020001, and the catalog includes <450>, <450LC>, <470H>, <470LCH>, <500LC> model tags as well as region codes [NA] for North America, [EU] for Europe, and [STD] for other regions. All NA-specific parts are clearly marked.

Bottom line: if you’re ordering parts for a Hitachi Sumitomo excavator in the 450-3 to 500LC-3 range, get the factory parts catalog. It’s the only way to be sure you’re holding the right part number. Access the Factory Manual now from AutoRepairManuals and keep it on your shop tablet.