Description

Hitachi Sumitomo ZX500LC, ZX500LCH Parts Catalog

You know the headache. You’re rebuilding a valve bank on a ZX500LC and the aftermarket parts list gives you a number that doesn’t match the casting. Or the diagram is so low-res you can’t tell if the spring goes above or below the poppet. That’s why you’re looking at this – the factory Hitachi Sumitomo ZX500LC, ZX500LCH Parts Catalog, 150 pages of OEM exploded views and part numbers that Hitachi’s own service guys use. Not a scanned reprint from some third-party outfit that guessed at the torque values. This is the original Japanese/English bilingual catalog (part number PI6R-EI-2) for the ZAXIS500LC and ZAXIS500LCH series hydraulic excavators.

The Table of Contents splits the machine into four major sections: PUMP, MOTOR, VALVE, and CYLINDER. Each section breaks down into subsections – the VALVE section alone has 20 listed items, from CONTROL (1/5 through 5/5) to PILOT, FC, SHUTTLE (again five subsections), SOLENOID, CHECK, LOCK, and HOLDING (boom, arm bottom, arm rod). That level of granularity is what separates a real parts catalog from a generic list you have to cross-reference yourself. Every part number ties to a specific diagram and position. You don’t guess.

Pump, Motor, and Valve Sections: 150 Pages of Exploded Views

Open to the PUMP section and you’ll find the piston pump, regulator, tilting-probing unit, and gear pump all drawn with every o-ring, bolt, and shim labeled. The MOTOR section covers the swing oil motor and the travel oil motor split across two subsections. But the real meat is the VALVE section. You get control valve diagrams in five spreads – because the main spool bank on a 50-ton excavator isn’t something you sketch on a napkin. Each spread shows exact stacking order, bolt lengths, and port locations. If you’re swapping a spool or replacing seals on the pilot valves, you need these diagrams in front of you. The 150 pages include the PARTS INDEX at the back, which lists every part number alphabetically/numerically so you can find any component without flipping through every page.

Why Factory Parts Catalog Beats Aftermarket Lists

I’ve seen aftermarket catalogs list the wrong pilot valve for a ZX500LCH because they didn’t account for the high-track or low-track configuration. That error costs you a week waiting for the right part and a pissed-off customer. This Hitachi Sumitomo Parts Catalog includes compatibility codes – Y (unconditional interchangeability), I (interchangeable with alternative part number), P (part prohibited, use alternative) – printed right on each page. The service code column tells you if the part requires dealer intervention (W), is only sold as an assembly (D), or is part of a service packet (K). That’s stuff you need to know before you call parts. The manual even notes over-size (OS) and under-size (US) parts on the line below the standard part, so you can machine your bores and order the right piston at the same time.

Related manuals you should consider for the Hitachi excavator family: Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages”>Hitachi Sumitomo ZAXIS850-3 Series Parts Catalog – 451 Pages, Hitachi ZAXIS 600/600LC/650H/650LCH Parts Catalog”>Hitachi ZAXIS 600/600LC/650H/650LCH Parts Catalog, and Hitachi ZAXIS50U-2 Excavator Parts Catalog”>Hitachi ZAXIS50U-2 Excavator Parts Catalog. Each one follows the same OEM exploded-view format.

Using the Parts Index and Compatibility Codes

Flip to the PARTS INDEX at the back of the catalog. Every part number listed in the exploded views appears here with its page reference. That’s the fastest way to look up a part you found buried in the machine. Cross-check the compatibility code: if the column shows a “Y”, the part number you have supersedes directly. If it shows an “I”, look at the alternative part number column – that’s the replacement you should order. The manual also includes a memorandum page (page 3) where you can record your machine’s product identification number, engine type, and engine serial number. Don’t skip that – it anchors the catalog to your specific unit (serial 003001 and up). This is especially critical for the ZX500LCH variant, which has different track frame and counterweight options that affect cylinder and holding valve part numbers.

Does This Catalog Cover the Full Machine?

It covers the hydraulic equipment components – pumps, motors, valves, cylinders. You will not find engine internal parts, electrical wiring diagrams, or track/undercarriage assemblies. Those are separate service manuals. What you get is every part that moves oil or controls movement: the piston pump with its regulator, the swing and travel motors, the entire control valve bank (five pages of spools and springs), pilot valves for front, swing, and travel, the FC valve (flow control), shuttle valves (five spreads), solenoid valves, check valves, lock valves, and holding valves for the boom, arm bottom, and arm rod. The cylinder section covers the boom (right and left), arm, bucket, and a special bucket cylinder for the 4.9m arm. If you’re stripping a machine to the frame, this catalog is your parts bible for the hydraulic infrastructure.

For a broader understanding of hydraulic system fundamentals, refer to Automotive Industry Overview”>Automotive Industry Overview or Internal Combustion Engine”>Internal Combustion Engine for engine-side context. (Note: those are general links; the Hitachi manual itself doesn’t cover engines. The parts catalog focuses strictly on the hydraulic and machine components.)

3 Valve Subsections You Should Memorize

The VALVE section contains 20 sub-subsections, but three will save you the most downtime. First: VALVE ; CONTROL (1/5 through 5/5) – that’s your main spool bank. Second: VALVE ; HOLDING (BOOM) – those poppets fail and drop the boom if you ignore the o-ring condition. Third: VALVE ; SHUTTLE (1/5 through 5/5) – shuttle valves are small but if they stick, you lose pilot pressure to an entire function. The catalog draws each shuttle valve with its spring, ball, and seat – no guessing which side faces up. Each diagram lists quantities per machine. For example, the boom holding valve assembly uses multiple check and relief cartridges; the exploded view shows exactly how they stack.

FAQ

Does this catalog include wiring diagrams?

No. This is a parts catalog – exploded views and part numbers only. Electrical diagrams require the separate service manual.

Can I use this to order parts for a ZX500LCH?

Yes. The catalog covers both ZX500LC and ZX500LCH variants. Pay attention to the compatibility codes and notes, especially for track- and counterweight-specific parts like holding valves and cylinder assemblies. The serial number cutoff is 003001 and up.

How are the compatibility codes explained?

Page 5 (the fore page) explains every symbol: Y = unconditional interchangeability, I = interchangeable with alternative listed, P = part prohibited (use alternative), W = dealer work needed, D = assembly-only replacement, K = part of service packet, S = service/supply part, OP = optional part, OS = oversize, US = undersize, # = new part in this catalog, T = combination interchangeability. If you see a code, always check the alternative part number column. The manual warns that parts with Y, I, or P codes may be automatically supplied as substitutes when you order. That’s critical for inventory accuracy.

What about the pump section – does it show the regulator parts?

Yes. The PUMP section includes a REGULATOR subsection with a dedicated exploded view and part numbers for all pistons, springs, shims, and seals. You can order the exact repair kit without disassembling first to match parts.

Bottom line: you need part numbers you can trust, not aftermarket approximations. This 150-page OEM Parts Catalog gives you the exact Hitachi Sumitomo numbers for every hydraulic component on the ZX500LC and ZX500LCH. Access the Factory Manual and put it on your tablet in the shop. When the master technician tells you to order a part, you want the number that matches the casting – nothing else.