Description

Hitachi Sumitomo 330-3, 330LC-3, 350H-3, 350LC-3, 350LCN-3 Parts Catalog

If you’ve ever ordered a part for a ZAXIS 330-3 and ended up with a seal that doesn’t fit because the aftermarket catalog mislabeled the breakout, you know the frustration. That’s why this factory Hitachi Sumitomo 330-3, 330LC-3, 350H-3, 350LC-3, 350LCN-3 Parts Catalog belongs on your bench. I’ve seen techs waste half a day cross-referencing generic numbers when the OEM part was four digits away. This manual stops that.

The thing runs 106 pages, not a PDF scraped from a forum. It’s the same binder Hitachi dealers pull parts from. Covers the 330-3, 330LC-3, 350H-3, 350LC-3, and 350LCN-3. Every page matches the hydraulic excavator serial numbers starting 050001. If you’re rebuilding a pump or swapping a brake valve, you need the exact part number, not a “similar” cross.

Pump Section: Device, Unit, Regulator, Gear

Open to the PUMP section. You’ll find four subsections: PUMP DEVICE, PUMP;UNIT, PUMP;REGULATOR, and PUMP;GEAR. Each gets its own exploded view with part numbers and quantities. The regulator assembly, for example, lists every washer and spring individually. No guesswork on which shim stack goes where.

Motor Assembly and the Brake Valve You Can’t Ignore

Under MOTOR, you get the swing device, travel device, and the two valves that keep you from losing control: VALVE;BRAKE and VALVE;RELIEF. The brake valve section shows the exact shuttle and spring pack for the 350H-3 travel motor. I’ve had customers install a generic relief valve and blow the swivel – this manual’s part number would have saved them.

106 Pages of Factory Part Numbers

Each of the 106 pages is a factory scan, not a recompiled list. The PARTS INDEX at the back cross-references every part number to its page. Need a pilot valve for the swing? Look up VALVE;PILOT (FRONT, SWING) – page reference is in the index. The manual uses Hitachi’s own symbol codes from the memorandum: Y for interchangeable, I for alternate, T for combination compatibility, P for prohibited. Memorize those and you’ll never order a superseded part.

What Does the Valve Section Cover?

Valves take up the bulk of the catalog: CONTROL (five sub-sections), PILOT (front/swing and travel), SOLENOID, LOCK, and SHUTTLE (also five sub-sections). Each control valve sub-section breaks down the spool, springs, and seals. The SHUTTLE section lists the poppets and seats for the 330LC-3, and the SOLENOID valve shows coil resistance data – though for exact electrical specs, pair this with the Hitachi Zaxis 330-3 350-3 Series Technical Manual.

Source Validity: Why Aftermarket Catalogs Fail

Aftermarket catalogs often merge multiple serial number breaks. This one is serial-number-specific. Hitachi issued it with a memo that says “descriptions may be slightly different from your machine” – and then gives you the exact interchangeability codes. That’s OEM integrity. If you’re working on a 350LCN-3, the aftermarket catalog may show the wrong boom cylinder seal kit. Not here. The CYLINDER section lists each cylinder (BOOM R, BOOM L, ARM, BUCKET) with separate part numbers for left and right. Compare that to generic catalogs that lump them together. For troubleshooting procedures, grab the Hitachi ZAXIS 330-3 350-3 Series Troubleshooting Manual; for step-by-step removal, use the HITACHI ZAXIS 330-3 350-3 Workshop Manual. As for aftermarket vs OEM documentation in heavy equipment, the Automotive Industry Overview shows why standardization matters. The same principle applies here: one wrong part number costs a day of downtime. The Automotive Industry Overview reinforces that OEM specs reduce variability.

FAQ

Does this catalog include torque specs or repair procedures?

No. This is a parts catalog only. Torque values and repair steps are in the workshop manual.

How do I interpret the service codes like Y, I, T, P?

Y means full interchangeability – the newer part works in place of the old one with no modifications. I allows one-way substitution (new part replaces old but not vice versa). T means the parts are interchangeable only as a matched set. P means the original part is prohibited; use the alternate listed. These codes are printed on every page that has interchangeable parts, and the manual’s memorandum explains them in both English and Japanese. If you ignore them, you might order a part that Hitachi has superseded twice, leading to a whole different assembly.

Are part numbers for the 350LCN-3 specifically listed?

Yes. The cover includes 350LCN-3, and the sections reference it throughout, especially in the travel device and valve groups.

Can I order parts directly from this manual?

Take the part number, quantity, model, and serial number to your Hitachi dealer. The manual includes the product identification number fields on the memorandum page – fill that out for your machine and you’ll avoid misorders.

If you’re rebuilding a pump or replacing a brake valve, having the right part number saves a week of downtime. Stop guessing. Access the Factory Manual and get the OEM numbers that match your machine’s serial break.