Description

Hitachi Sumitomo ZAXIS 330, ZAXIS 330 LC, ZAXIS 350 LC, ZAXIS 350 LCN, ZAXIS 350 H Parts Catalog

Ordering parts for a Hitachi Sumitomo excavator without the factory numbers? That is how you get a box of wrong seals and a machine sitting for a week. Every time I see a guy here in San Antonio trying to match a worn-out brake valve by eyeball, I know he’s about to waste a hundred bucks. This Hitachi Sumitomo ZAXIS 330, ZAXIS 330 LC, ZAXIS 350 LC, ZAXIS 350 LCN, ZAXIS 350 H Parts Catalog—187 pages, direct from the factory—gives you the exact part number for every bolt, seal, piston, and valve plate. No aftermarket guesswork. No “this looks close” nonsense.

Out here, you don’t have time to cross-reference three different sources. The manual breaks down every major hydraulic assembly. You want the relief valve inside the travel motor? It’s listed under MOTOR;OIL (TRAVEL) right next to the brake valve. Page numbers? Use the table of contents—it’s laid out by system: PUMP, MOTOR;OIL, VALVE, CYLINDER. That’s it. No clutter.

187 Pages of Factory Part Numbers

The catalog covers five main model families: ZAXIS 330, 330 LC, 350 LC, 350 LCN, and 350 H. Each one has its own serial number range printed on page 1. If your machine falls outside that range, call Hitachi—I’m not going to lie to you. Inside, every section starts with an exploded view. You get the figure, then a table with the reference number, factory part number, part name, quantity per assembly, and service code. The service code tells you if a part is only available as a kit (K) or if it’s an oversize (OS) or undersize (US) service part. That saves you a return trip to the parts counter.

One thing I respect: the manual prints the compatibility codes. If a part supersedes to another number, they mark it with I, P, T, or Y. That’s “interchangeable one-way,” “prohibited,” “combination required,” or “unconditional.” You don’t get that in aftermarket catalogs.

Brake Valve Assembly: Two Locations

The brake valve isn’t a single part. Under MOTOR;OIL (TRAVEL) you’ll find the VALVE;BRAKE for the travel motor. Then under MOTOR;OIL (SWING) there’s a separate VALVE;BRAKE for the swing motor. Different numbers. If you order the wrong one, the swing brake won’t hold and you’ll drift into a trench. I’ve seen it. The catalog lists each brake valve with its own part number, quantity, and—if there’s a supersession—the replacement part number. You also get the relief valve settings (spring codes) so you can match the cracking pressure. No spring scale needed if you order the factory-specified part.

What Does the Valve Section Cover?

Over half the catalog is VALVE. That’s the main control valve, split into six sub-sections (CONTROL 1/6 through 6/6). Each sub-section shows the spools, springs, plugs, and the body sub-assemblies. Then you’ve got separate sections for VALVE;PILOT (FRONT & SWING), VALVE;PILOT (TRAVEL), VALVE;FC, VALVE;SOLENOID (four listings), VALVE;SLOW-RETURN (two listings), VALVESHUTTLE, VALVE;SHUTTLE, VALVE;LOCK, VALVE;SELECTOR, and a generic VALVE. That’s the breadth you need when you’re rebuilding a sticking spool. The parts index at the back—alphanumeric by part number—lets you find the page instantly if you have an old part in hand.

Get the Right Brake Valve Part Number

Don’t rely on aftermarket cross-reference charts. They miss revisions. The catalog marks each part with a “machine number” range (the last six digits of your PIN) and a production date code. Example: D03/09 means starting September 2003. If your serial number falls after that, you get the updated part. Ignoring that detail means you install a brake valve that goes out of adjustment in 200 hours. Look at the “APPLICABLE MACHINE NUMBER” header on each section—it’s printed right above the parts list.

3 Reasons to Choose OEM Documentation

First, the part numbers are guaranteed to be correct for the model-year range listed. Second, the compatibility codes prevent you from using a superseded part that doesn’t work with your older components. Third, the service codes tell you whether a seal kit is mandatory (K) or if you can buy individual O-rings (no service code). My shop uses this catalog for every Hitachi Sumitomo rebuild. It pays for itself the first time you don’t order a $400 solenoid valve that fits a later series but doesn’t match your connector.

Pair this catalog with the troubleshooting manual if you’ve got a hydraulic issue. The HITACHI ZAXIS Troubleshooting Manual walks you through pressure tests. Need a more complete parts breakdown for the same models? Grab the HITACHI ZAXIS 330 350 370 Parts Catalog for the larger series. And if you’re working on the big iron, the Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages covers those monster machines.

For context on why factory documentation matters across the Automotive Industry Overview, remember that every revision is tied to a production change. The same principle applies in heavy equipment. Hitachi archives these changes in their parts legacy system. Automotive Industry Overview shows how manufacturers track component revisions—you’re getting that level of accuracy here.

I need a part for a ZAXIS 350 LCH. Will this catalog work?

No. The catalog covers 330, 330 LC, 350 LC, 350 LCN, and 350 H. The 350 LCH is listed only in the foreword as a related model, not in the parts sections.

Can I use this catalog to find the torque spec for a valve cover bolt?

Parts catalogs list part numbers, not torque values. Torque specs are in the service manual. This catalog will give you the correct bolt part number (and thread size from the part name), but for tightening sequence and foot-pounds you need the factory workshop manual. Check the HITACHI ZAXIS Troubleshooting Manual if you suspect a torque-related failure; it includes critical tightening specs.

You need this catalog on your workbench if you touch any Hitachi Sumitomo excavator. Don’t trust a scanned aftermarket PDF that renumbers components. Get the real OEM file with the original part numbers, compatibility codes, and serial-number breaks. Access the Factory Manual.