Description

Hitachi Sumitomo 330LC-3, 350LC-3 Parts Catalog – Stop Ordering the Wrong Parts

If you’ve ever waited three days for a control valve seal only to find it’s the wrong revision, you know exactly why this Hitachi Sumitomo 330LC-3, 350LC-3 Parts Catalog belongs on your bench. Twenty-eight years in the shop taught me one thing: guess on part numbers and you lose billable hours. This is the OEM catalog – 52 pages, direct from Hitachi Sumitomo, not some generic PDF that renumbers parts to fit their database. The file name alone tells you it’s legit: HITACHI_330LC-3-350LC-3_Parts_Catalog_en-ja-31114003888.pdf. No third-party repackaging. No lost detail in the scanning.

The catalog covers the Super Long Front (Type H18) for both the 330LC-3 and 350LC-3, starting at serial No. 050001. Inside you get exploded diagrams with every bolt, shim, and valve identified. Need the part number for a slow-return valve? It’s in the section titled VALVE;SLOW-RETURN. Want the exact counterweight assembly? COUNTERWEIGHT (Type H18) gives you the breakdown. This is not a service manual – it’s a parts dictionary. Use it with the workshop manual to avoid ordering the wrong hydraulic seal or bracket.

CONTROL VALVE (Type H18) – What’s Listed

Two chapters cover the main control valve group. CONTROL VALVE (Type H18) shows the complete assembly. SLOW-RETURN PIPING (Type H18) and VALVE;SLOW-RETURN cover the valve that governs drift on the boom. Each component gets a line item with part number, quantity, and service code. If you see a symbol like W in the service code column, that part requires local machining – don’t expect a drop-in replacement. That level of detail is why aftermarket catalogs leave you stuck.

For the hydraulic plumbing, FRONT PIPING (1) and FRONT PIPING (2) split the lines between the arm cylinder (CYL.;ARM) and bucket cylinder (CYL.;BUCKET). LUBRICATE PIPING (Type H18) handles the grease lines. If you’re rebuilding a used machine, you’ll need the BUCKET 0.52m3 (JIS94) section because that bucket size is specific to the Super Long Front configuration.

SWING DEVICE and ELECTRIC PARTS – Don’t Skip These

SWING DEVICE lists the swing motor, gearbox, and bearing components. ELECTRIC PARTS covers sensors, switches, and the wiring harnesses that connect the boom and arm. I’ve seen guys order a whole swing motor because they misread a part number on a pressure switch. This catalog stops that. Every electrical component has a reference to the assembly it belongs to. Pair it with the Hitachi Zaxis 330-3 350-3 Series Technical Manual for wiring diagrams and you’ll trace electrical faults without burning a harness.

BOOM, ARM, and BUCKET – Structural Components

BOOM (Type H18) and ARM (Type H18) give the steel weldments, pin bosses, and bushing part numbers. If you’re replacing worn pivot pins, you need the exact length and diameter. The catalog includes the pin part numbers and the required number per machine. Same for the bucket – BUCKET 0.52m3 (JIS94) shows cutting edge, teeth, and side cutters. Ordering a bucket from a generic supplier without cross-referencing these numbers is a gamble. Don’t gamble.

One thing that separates OEM catalogs from reprints: the interchangeability symbols. On page 4 of the PDF (the FOREWORD section), you get the full legend: Y means fully interchangeable, I means a one-way swap (you can substitute but not reverse), P means the part is superseded and the replacement is shown. The PARTS INDEX at the back lists every part number alphabetically with its page reference. That alone saves hours.

How to Use the Parts Index and Symbols – Read the Foreword

The FOREWORD on page 2 explains how to order: model, product ID, part number, part name, quantity. The MEMORANDUM page is where you fill in your machine’s serial number and engine info. Do it in pencil – you might need to reference it later. The service code column uses letters like H (precision part, dealer repair only) and D (assembly replacement only). Don’t ignore D – if that symbol is there, you cannot buy the inner part separately. You’ll end up buying the whole valve block. Check the compatibility column before you add a line to your order sheet. Hitachi ZAXIS 330-3 350-3 Series Troubleshooting Manual helps diagnose why a part failed, but this catalog tells you what to order to fix it.

Why trust an OEM scan over a copy? The Automotive Industry Overview for construction equipment is built on part number traceability. This PDF is a direct scan of the factory binder – no reprints, no missing pages, no scanned-over crop marks. The OCR excerpt shows Japanese and English side by side, exactly as Hitachi Sumitomo intended. That matters because some symbols are only explained in the English foreword; if a reprint cuts that page you lose the key to the whole catalog. This one has it all.

3 Reasons to Choose This OEM Parts Catalog Over Alternatives

First, the serial number range is verified for the Super Long Front configuration. Second, the 52 pages are complete – from COVER to PARTS INDEX, including the MEMORANDUM and FOREWORD. Third, the part numbers are factory-original, not reassigned by an online database. If you’ve tried ordering from a generic parts site using a description, you know the pain of receiving a box that doesn’t fit. Use the exact part number from this catalog and it matches the machine. HITACHI ZAXIS 330-3 350-3 Workshop Manual provides the torque specs and removal procedures – combine them and you have the full repair package.

A short note on the valve section: CONTROL VALVE (Type H18) has multiple sub-assemblies. If you need the slow-return valve, you’ll find it under VALVE;SLOW-RETURN. Don’t order the entire control valve block if only the slow-return valve is leaking. Check the exploded view, find the part number, and order that single valve. The catalog gives you the quantity per machine – usually one. That kind of precision keeps your parts budget from bleeding.

Does this catalog show which serial numbers apply?

Yes. It covers 330LC-3 and 350LC-3 with serial No. 050001 and up.

What do the symbols like W, H, D, K mean?

They’re service code and interchangeability symbols from the Japanese and English foreword. W = requires local machining – contact Hitachi. H = precision part – dealer repair only. D = assembly only – do not order the inner part separately. K = part of a service kit. There are also compatibility symbols: Y (fully interchangeable), I (one-way substitution), P (superseded – use the replacement listed). These are critical for ordering correctly. If you skip reading the FOREWORD, you’ll likely buy a part you can’t install. The symbols are explained on page 4 of the PDF.

You’ve got a machine to keep running. Don’t waste time chasing wrong part numbers. The Hitachi Sumitomo 330LC-3, 350LC-3 Parts Catalog gives you the exact OEM data – 52 pages, no guesswork. Access the Factory Manual and get the parts you actually need.