Hitachi ZAXIS 330 350 Parts Catalog – OEM 824 Pages

Ordering the wrong part for an excavator costs time and money. On a jobsite, downtime burns through profit fast. That’s why you need the original OEM documentation – not a third-party reprint. The Hitachi Sumitomo ZAXIS 330, ZAXIS 330LC, ZAXIS 350LC, ZAXIS 350LCN, ZAXIS 350H Parts Catalog is the only source you should trust for part numbers, exploded diagrams, and factory-level identification.

This is a factory-issued Parts Catalog, not a workshop manual. It covers every bolt, hose, seal, and assembly that goes into these machines: the ZAXIS 330, 330LC, 350LC, 350LCN, and 350H. At 824 pages, it gives you the exact part numbers for ordering replacements. No cross-referencing aftermarket charts. No guessing on superseded parts.

The catalog breaks down by machine section. For example, the Engine section lists all engine support components, oil filter piping, intercooler piping, radiator, air cleaner, muffler, fuel tank, fuel piping, fuel feed pump, double filter, and pump device. Page numbers for each subsection are clearly marked. Need the part number for a counterweight on a ZAXIS 350? There’s a section for Counterweight 8.2T <350>. That’s the kind of specificity you get.

You’ll find detailed piping diagrams: suction, delivery, return, drain, main piping (multiple runs), boom bottom piping, and side branch piping. Pilot piping alone has 11 sections – that’s how thorough this catalog is.

Parts Catalog Coverage: ZAXIS 330, 330LC, 350LC, 350LCN, 350H

Every major assembly is broken down with exploded views. The contents list covers Upperstructure, including Frame variants, Counterweight options, Engine, Hydraulic piping, Control valves, Pilot piping, Console, Cab groups, and Electrical parts. Each section is tagged with machine model codes <330>, <350>, <370>, <H>, <K>, <MTH>, and regional codes like [NA] or [EU3]. If your machine is a ZAXIS 350LCN, you’ll find sections specifically for that variant in the piping and cab groups.

Why OEM Beats Aftermarket Parts Catalogs

Aftermarket catalogs often re-label part numbers or skip rare superseded pieces. This is a direct factory PDF from Hitachi Sumitomo. The page numbering, index, and part number sequences match exactly what the dealer uses. If the manual lists a part number as A810165 O-ring, that is the part you order. No conversion table needed. The service codes – W, H, D, K, R, S, Z, OP, OS, US – tell you exactly how to handle each component.

What’s Inside the Engine and Hydraulic Sections?

The Engine chapter covers everything from the engine support itself to the inter cooler net, radiator support, reserve tank, air cleaner (including pre-cleaner and parts), muffler, fuel tank, and all fuel piping. The pump device and swing device are documented separately. The hydraulic piping sections are split into suction, delivery, return, drain, and main piping (four separate runs). For the ZAXIS 350 with EU3/EU4 compliance, there are dedicated sub-sections – see Main Piping (2) <350, MTH[EU3, EU4]>. That level of detail means you won’t misorder a hose because of regional emissions equipment.

3 Reasons to Use Factory Part Numbers

• No assembly guesswork: Every nut, bolt, and seal is listed with a part number and quantity per machine.
• Supersession clarity: The catalog uses service codes to indicate new parts (*) and factory-issued supersessions.
• Cross-model compatibility: Sections like Counterweight <330> and Counterweight <350, MTH[EU3, EU4]> show you exactly which parts interchange.

Skip the aftermarket charts. Spend your time wrenching, not hunting for numbers.

Counterweight Options: 330, 350, and 370

The catalog includes separate counterweight sections for each major model. For the ZAXIS 350, there’s even a Counterweight 8.2T variant. If your machine has a different cab guard or boom light configuration, those are listed under their own headings – Boom Light (R) with options for mono boom or 2P-boom. The electrical parts section covers everything from front head lamps (2-lamp or 4-lamp) to the rotating beacon, fuse box, horn, swing motion alarm, and travel motion alarm.

For comprehensive diagnostics, pair this catalog with the HITACHI ZAXIS Troubleshooting Manual. If you need to verify part numbers across multiple machines, the HITACHI ZAXIS 330 350 Parts Catalog is the current product. For larger excavators, refer to the Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages.

For background on heavy equipment documentation standards, see the Automotive Industry Overview. The same Automotive Industry Overview outlines why OEM specs matter for safety and reliability.

Frequently Asked Questions

Does this Parts Catalog include torque specifications for assembly?

No. This catalog lists parts only, not torque values.

Can I use this catalog to order parts for a ZAXIS 370 or ZAXIS 350K?

The catalog covers ZAXIS 330, 330LC, 350LC, 350LCN, 350H, 350LCH, 350K, 350LCK, 370, and 370MTH. Check the table of contents for sections marked with <370> or <K>. Each machine variant has its own notes. For the 370, look for sections like <370, H, MTH>. For the 350K, look for <K>. If your machine is not listed, you need a separate catalog. Always verify your serial number range matches the catalog’s application listing – serial number 030001 and up.

Are the diagrams clear enough to identify small seals and O-rings?

Yes. Each part has a reference number next to the diagram. The parts list includes a service code that indicates if a part is a precision component (H) or must be replaced as an assembly (D). O-rings are listed with dimensions in the parts list.

Is this catalog available in English only?

The catalog includes both Japanese and English text. Part numbers are universal. Instructions and notes appear in both languages. The index at the back lists part numbers in numeric order for quick lookup.

Stop wasting time with aftermarket lookups. Get the actual factory data from Hitachi Sumitomo and order the right part the first time. Download the Factory Manual now.