Description

Hitachi Sumitomo ZX330-3, ZX330LC-3, ZX350LC-3, ZX350LCN-3, ZX350H-3 Parts Catalog

You have a machine down, a part number you cannot read off the old seal, and a parts counter that wants a serial number and a diagram reference. That is where this 637-page Hitachi Sumitomo ZX330-3, ZX330LC-3, ZX350LC-3, ZX350LCN-3, ZX350H-3 Parts Catalog earns its place on the workbench. It is the same binder the dealer uses. Every exploded view, every part number, every quantity per machine — pulled from the factory database, not a third-party recompile.

I have been wrenching on excavators since before most of these machines were built. Aftermarket parts catalogs leave out the interchange codes, the service kit flags, the supersession notes. This one does not. It tells you which parts are service-kit items (marked K), which require dealer machining (W), and which are precision components (H) that should not be field-repaired. That information saves you a return trip to the parts store.

Engine and Fuel System Coverage

Engine section starts with the mounting brackets and support isolators, then moves through the oil filter piping, intercooler piping, and the complete air cleaner assembly including the pre-cleaner and its mounting parts. Fuel system is broken into the tank, tank support, and the full fuel piping run from tank to pump device. Each line in the diagram has a part number and a quantity. If you need the fuel return line o-rings, you find them under FUEL PIPING, not buried in a generic o-ring chart.

Fuel tank support brackets are listed separately for the standard and LC undercarriage variants. The parts catalog marks each illustration with model codes — <330> for ZX330-3 and ZX330LC-3, <350> for ZX350LC-3 and ZX350LCN-3, for ZX350H-3. You do not guess which bracket fits your machine. You read the indicator at the top of the page.

7 Systems Covered in This Parts Catalog

Upperstructure, undercarriage, engine, hydraulic pump and swing device, control valve and pilot piping, electrical system, and cab assembly. Each system is broken into subassemblies with their own exploded views. The upperstructure section alone covers the frame, counterweight, boom foot pin, center joint, and all the piping groups — suction, delivery, return, drain, main piping in four separate groups, and the boom bottom piping. If you are rebuilding a control valve, the SOLENOID VALVE and CONTROL VALVE SUPPORT pages give you the exact bolt kit and seal part numbers.

Pilot piping is split into ten lettered groups (A through J). That level of detail means you can order the correct hose assembly for the pilot line that runs from the console to the control valve without pulling the entire harness.

Does This Manual Cover the ZX350LCN-3 and ZX350H-3?

Yes. The catalog includes model indicators for every variant. ZX350LCN-3 is marked (LCN) and [EU] for European specification. ZX350H-3 is marked . ZX350LC-3 for North America is marked [NA]. Each page header tells you which models the parts on that page apply to. If a part is common across all models, the header says ALL MODEL. You do not need to cross-reference a separate supplement.

For the engine parts themselves — pistons, rings, liners, gaskets — the foreword on page 3 directs you to the separate engine parts catalog. That is standard practice. Hitachi does not duplicate the engine manufacturer’s catalog. This document covers everything bolted to the engine: supports, piping, filters, intercooler, muffler, and the engine control unit.

Source Validity: OEM vs Aftermarket Documentation

This is a direct scan of the Hitachi Sumitomo factory parts catalog, file name Hitachi_ZX330-3-ZX330LC-3-ZX350LC-3-ZX350LCN-3-ZX350H-3_Parts_Catalog_en-ja-31114020625.pdf. The memorandum page (page 2) includes the Product Identification Number and Engine Mfg. Number fields for you to fill in. That is the same form the dealer uses when they pull parts for your machine. Aftermarket catalogs do not include the interchange code table on page 3 — the Y, I, T, P codes that tell you whether a part supersedes or is restricted. This one does.

I have seen too many jobs held up because a generic parts list showed the wrong pilot hose length. The factory catalog gives you the exact part number, the quantity per machine, and the service code. If the part is marked D (cannot be replaced individually), you order the assembly. If it is marked K, you order the service kit. That is information you cannot get from a third-party website.

What Torque Values Are Listed?

This is a parts catalog, not a service manual. Torque values are not printed in the parts catalog. You need the separate service repair manual for tightening specs. What this catalog gives you is the correct part number for every bolt, washer, and seal in the assembly. When you have the right bolt, you can look up its torque spec in the service manual. Using the wrong bolt because a generic catalog listed a substitute is how you snap a fastener in the counterweight mounting.

Related manuals you may need for a complete repair library: Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages, Hitachi ZAXIS 600/600LC/650H/650LCH Parts Catalog, Hitachi ZX500LC ZX500LCH Parts Catalog.

FAQ

Does this parts catalog include wiring diagrams?

No. Wiring diagrams are in the service repair manual. This catalog lists the electrical parts — the engine control unit, GPS parts, fuse box, horn, swing motion alarm, travel motion alarm, overload alarm device, rear camera, and all the lamp assemblies — with their part numbers and quantities.

Can I order parts directly from this catalog?

Yes. Take the part number from the exploded view to your Hitachi Sumitomo dealer. The catalog uses the same numbering system as their inventory system.

What is the difference between the ZX330-3 and ZX330LC-3 in this catalog?

Track frame length and undercarriage components. The LC model uses longer track frames and different track guard configurations. The catalog marks each undercarriage page with (STD) or (LC) indicators.

How do I read the interchange codes on page 3?

Y means unconditional interchange. I means the listed part can replace the original, but not vice versa. P means the original part is prohibited — use the substitute. T means the parts are interchangeable only as a set. These codes are printed in the Compatibility column next to each part number.

For background on how internal combustion engines work in these machines, see Internal Combustion Engine. For an overview of the automotive and heavy equipment industry, see Automotive Industry Overview.

You need the right part number the first time. Access the Factory Manual and keep it on the tablet in the cab. When the pilot hose blows on a Friday afternoon, you will have the diagram and the part number before the dealer closes.