Description

Hitachi Sumitomo ZAXIS 600, ZAXIS 600LC, ZAXIS 650H, ZAXIS 650LCH Parts Catalog

If you have ever tried to order a hydraulic spool or seal kit from an aftermarket cross-reference list that is off by a few thousandths, you already know the headache. That is why I keep a copy of the Hitachi Sumitomo ZAXIS 600, ZAXIS 600LC, ZAXIS 650H, ZAXIS 650LCH Parts Catalog within arm’s reach at my shop. This is the factory-issued 162-page breakdown of every component in the pump, motor, valve, and cylinder assemblies. No third-party translation errors. No reprints that blur the part numbers. Just the OEM part numbers Hitachi assigned when they built the machine.

Pump and Motor Breakdowns

The catalog starts with the PUMP section – piston pump, regulator assembly, tilting-probing unit, and gear pump. Each sub-section has an exploded diagram with callouts for every shim, piston, and seal. The MOTOR section covers the swing motor and travel motors (split into 1/2 and 2/2). If you need the part number for the swash plate or a port seal, you will find it here. I have watched guys try to use generics on these motors and end up with drift on the swing brake. That is a job you do twice. Use the factory numbers.

Valve Assemblies: What the Catalog Covers

The VALVE section is the heart of this catalog – it runs five pages for the control valve alone, plus separate entries for pilot valves (front, swing, travel, breaker), solenoid valves, shuttle valves (five sub-sections), lock valve, FC valve, check valve, and holding valves for boom and arm. Page 4 explains the compatibility symbols: W for field modification, D for assembly-only replacement, K for service kit, R for shims that vary by machine, S for service parts, OP for optional items. You need those symbols when ordering. Without them, you might order a component that requires field machining (W) when you expected a bolt-on part. The catalog also includes notation for oversize (OS) and undersize (US) parts. That saves you from ordering the wrong piston size after a bore repair. Every valve sub-section shows the exact machine serial number range that applies. If you have a ZAXIS 650LCH with a serial after 004001, this catalog matches.

Does This Manual Include Cylinder Part Numbers?

Yes. The CYLINDER section lists boom cylinders right and left, arm cylinder, and bucket cylinders for every arm length – 2.9m, 3.5m, HD 3.4m, 4.1m, and 5.2m. Each cylinder gets its own exploded view. You can order the correct seal kit based on your arm configuration, which keeps you from tearing down a cylinder only to find the gland nut is a different thread pitch. The catalog even includes a general cylinder page for non-specific builds.

3 Reasons to Use an OEM Parts Catalog

First, factory part numbers eliminate order errors. The dealer’s computer wants a number, not a description. Second, the compatibility symbols (page 4) tell you if a part is interchangeable with a later revision – that is the Y, I, T, P codes. Third, the parts index at the end lets you search by part number to find which assembly it belongs to. You get the same data the dealer parts counter uses. Aftermarket catalogs often merge multiple machine families into one listing; this catalog is specific to these four models.

Get the Right Part on the First Call

When you call the parts line, they want your machine serial and a part number. This catalog gives you both. Read the part number off the page, confirm the serial range, and the order goes through without hold music. I have seen mechanics waste a week chasing a valve that did not exist because they used a generic number. That week costs more than the catalog.

Skip the aftermarket catalogs.

If you also work on larger Hitachi rigs, the Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages covers a different weight class. For the ZX500LC platform, see Hitachi ZX500LC ZX500LCH Parts Catalog. The same factory-standard format applies to HITACHI ZAXIS 600 650 Parts Catalog – that link points to the full series listing. For general background on diesel engines, the Internal Combustion Engine article explains the four-stroke cycle, and the Automotive Industry Overview gives context on how OEM documentation standards evolved.

Frequently Asked Questions

Does this catalog include the ISUZU engine parts?

Yes, the ISUZU BB-6WG1X engine is listed on page 3 with the engine type and serial number format. However, this catalog focuses on hydraulic components; engine internal parts are not detailed here.

Are there torque specs in this parts catalog?

No, this is a parts catalog – it shows exploded views and part numbers. You need the service manual for assembly torque values and clearances. The parts catalog is still critical for identifying which shims, seals, and fasteners to order. I have had techs skip this step and end up with a control valve that will not shift because they used a generic o-ring. Without the right part number, you get the wrong hardware, which leads to leaks or failures. Always pair this catalog with the factory service manual for that machine.

Can I use this to rebuild the hydraulic pump?

You can identify every piston, swash plate, and seal in the pump section. The catalog will not tell you how to reassemble it, but it gives you the part numbers for the piston pump group, regulator, and gear pump. That is what you need to order the correct rebuild kit.

Is the catalog in English?

Bilingual Japanese and English.

Access the Factory Manual now and stop guessing your parts numbers.