Description

Hitachi Sumitomo 450-3, 450LC-3, 470H-3, 470LCH-3, 500LC-3 Parts Catalog

Been burned ordering the wrong hydraulic pump seal? Wasted a Saturday because the parts diagram you found online used a different revision? I see it all the time. This Parts Catalog for the Hitachi Sumitomo 450-3, 450LC-3, 470H-3, 470LCH-3, and 500LC-3 is the real factory document – not a copy, not a third-party scan. 156 pages of OEM part numbers, exploded views, and compatibility codes that tell you exactly what fits and what doesn’t. No guesswork.

The catalog covers pump assemblies (piston, regulator, gear, fan drive), motor assemblies for swing and travel, the entire valve group, and cylinders for boom, arm, and bucket. You get the same document a dealer parts counter uses. If you’re maintaining a fleet or restoring a machine, this is where you start.

Pump Assemblies: Piston, Regulator, Gear, and Fan Drive

Four distinct pump subsystems are broken down individually. The PUMP section starts with the main piston pump, then the regulator, the gear pump, and the separate fan-drive piston pump with its own regulator. Each subsection lists every component – from the swash plate down to the smallest seal. Page numbers for each subgroup are clearly marked, so you can flip straight to the charge pump gears or the regulator spool without hunting through 50 pages. Need a part number for the piston shoe? It’s there, with the correct quantity for one machine.

Motor Assemblies: Swing and Travel Devices – 450, 470, and 500 Variants

The MOTOR section is split by function and model. Swing device (right and left) gets its own pages, with the oil motor and the swing transmission separate. Travel device is handled in two groups: <450, 470> and <500>, because the final drives differ. Each travel motor has two pages (1/2 and 2/2) showing the motor body and the drain/brake components. Then the travel transmission is listed. If you’re rebuilding a swing gearbox on a 470LCH-3, you need the swing device (R) and (L) bookmarks – they’re in there. The fan-drive motor is included as a standalone unit. One more thing: pay attention to the “H” symbol in the margin – that marks the machine serial number range where a part changed. Ignore it and you’ll get the wrong motor seal.

Valve Group: Control, Pilot, Shuttle, Solenoid, Relief, Check, Lock

This is the thickest section of the catalog, and for good reason. The VALVE group covers control valves (four pages of main spool sections), pilot valves for front/swing and for travel, a flow control valve, five shuttle valve subsets (1/5 through 5/5 plus a standalone), plus solenoid, relief, check, and lock valves. Also included: the oil filter and the center joint. Every valve assembly is drawn with all internal parts numbered. If you need the relief valve setting shims or the lock valve poppet, the part numbers are here. The catalog also marks “D” for design change dates, so you know exactly when a valve cartridge was superseded. Do not order a shuttle valve without checking the model year – there are five different revisions listed for a reason.

Cylinder Assemblies: Boom (R/L), Arm, Bucket, and Generic Cylinder

The CYLINDER section covers the excavator’s work group. Boom right and left are separate due to the different port blocks and cushion valves. Arm cylinder and bucket cylinder are listed individually. There’s also a general cylinder subsection for any non-standard attachments. Each cylinder is shown with seal kit components, piston rod, gland, and tube assembly. The parts index at the back of the catalog cross-references every part number to the page where it appears, so you can start from a number and find the location. That index alone saves hours when you’re trying to identify an unmarked part that fell out of a disassembled cylinder.

How to Read the Compatibility Symbols Without Guessing

Inside the front matter (page 5 of the PDF), there’s a full legend of symbols: Y for unconditional compatibility, I for interchangeable one-way, P for prohibited, K for service kit, R for quantity varies by serial number, and so on. If you see “D” in the service code column, that marks the month and year a change took effect – for example, D03/09 means September 2003 onward. The catalog uses these symbols on every parts list. Overlooking a “P” symbol means you’ll order a part that’s been banned from service. The manual also notes that when a “Y” or “I” or “P” appears, the dealer may automatically supply the alternate part number listed in the replacement column. I’ve watched guys order the old part number, then wonder why the new seal kit doesn’t fit. Read the symbols. They’re there because Hitachi Sumitomo changed things mid-production.

If you need the workshop manual for overhaul procedures, check the HITACHI ZAXIS 450-3 500LC-3 Workshop Manual. For a later-model parts catalog covering 2007 machines, see the Hitachi ZAXIS 450LC-3 470LCH-3 2007 Parts Catalog. A separate listing for related models is the HITACHI ZAXIS 450-3 470H-3 500LC-3 Parts Catalog. For context on automotive and heavy-equipment industry standards, you can read the Automotive Industry Overview. Same link for the Automotive Industry Overview – it’s a broad reference, but your machine’s specific parts live in this catalog.

FAQ

Does this catalog include torque specifications for assembly?

No. This is a parts catalog, not a workshop manual. It shows every component, part number, and quantity, but it does not list torque values or repair procedures. For torque specs, you need the Hitachi Sumitomo workshop manual.

Can I use this catalog to order replacement parts from my local dealer?

Yes. All part numbers are OEM Hitachi Sumitomo numbers. Give the dealer the exact number from these pages, and they will supply the correct component. The compatibility symbols help if a part has been superseded.

How do I know which pump regulator version my machine has?

Look at the serial number of your machine. The catalog lists two separate regulator subsections under PUMP – one for the main pump and one for the fan-drive pump. Each has a serial number range in the header. Match your machine’s PIN to the range shown in the catalog.

Why are there five shuttle valve subsections in the valve group?

Different hydraulic functions require different shuttle valve configurations. The catalog separates them by function and by design change over production life. If your machine has a specific shuttle valve for the swing priority circuit, it will be in one of those five groups. Check the valve body casting number against the photos in the catalog.

Stop losing time on wrong parts. This is the original factory document – 156 pages of Hitachi Sumitomo part numbers, diagrams, and compatibility codes for the 450-3, 450LC-3, 470H-3, 470LCH-3, and 500LC-3. Access the Factory Manual and put the correct parts on your bench.