Description

Hitachi Sumitomo ZAXIS850-3, ZAXIS850LC-3, ZAXIS870H-3, ZAXIS870LCH-3 Parts Catalog

You’ve got a machine down, a part number you don’t trust, and a parts counter that talks to you like you’re guessing. That’s the pain. This 451-page OEM parts catalog from Hitachi Sumitomo covers the ZAXIS850-3, ZAXIS850LC-3, ZAXIS870H-3, and ZAXIS870LCH-3 — all four models in one bound document. It’s not a third-party rehash. It’s the same binder the dealer uses. Every part number is factory-verified. Every exploded view shows you exactly how the upper structure, undercarriage, and front-end attachments come apart. No guesswork, no “that looks about right.” You get the actual diagram for the counterweight support, the fan drive piping, the pilot piping runs — all of it. And the memorandum on page 2 tells you how to read the model codes: <850> means ZAXIS850-3, <850LC> means ZAXIS850LC-3, <870H> means ZAXIS870H-3, and <870LCH> means ZAXIS870LCH-3. You can’t screw up the application if you follow that key.

Engine, Pump, and Control Valve: Three Hardest-Hit Sections

These three systems kill the most billable time on a 50-ton excavator. The catalog breaks out the ENGINE section with mounting, oil filter piping, air cleaner parts, muffler, radiator support, and fan drives. The PUMP DEVICE section includes the pump itself, the drain piping, tail hose parts, and the suction piping. The CONTROL VALVE section shows the main valve body and all the return piping for the C/V. Page 3 has a legend for the compatibility symbols: Y means unconditional interchangeability, I means you can use the substitute part instead of the original (but not the other way around), T means only in combination, P means the part is prohibited. Memorize that table before you open any section. It saves you ordering the wrong O-ring seat because you didn’t notice the “I” flag.

Symbol Codes: What Page 3 Tells You

Page 3 of this catalog is where most DIY guys get lost if they skip it. The Japanese text is there, but the symbol table is bilingual. W means local processing required at the factory — don’t weld that bracket yourself. H means precision part — send it back to Hitachi Sumitomo. D means you can’t replace the item individually — you buy the whole subassembly. K means it’s included in a service parts kit. R means the quantity varies by serial number (shims, adjustments). Z is an engine-related part — cross-reference to the separate engine parts catalog. OP means optional — not on standard machines. OS and US are oversize and undersize parts. If you ignore these symbols, you’ll end up with a part that doesn’t fit because your machine has the OS piston and you ordered standard. Don’t be that guy.

Does This Manual Cover All Four Models?

Yes. The catalog is split by model-specific markers at the top of each page. For the upperstructure, sections like COUNTERWEIGHT 13.3t apply to all models unless labeled otherwise. The undercarriage sections differentiate between <850,870H> and <850LC,870LCH> for track side frames, adjusters, lower rollers, and travel piping. The front-end attachments section covers STD boom 8.4m, H boom 8.4m, BE boom 7.1m, and the corresponding arms and buckets. If your machine has an 8.4m H boom, you go to the H BOOM 8.4m page — the exploded view shows the pin, bushing, and seal part numbers specific to that reinforcement. No mixing STD and H parts. The catalog also includes region-specific sections like RADIO (NORTH AMERICA) and CONSOLE COVER [NA,EU]. If you bought your machine from a Canadian dealer, you get the NA wiring and radio parts.

3 Reasons You Need OEM Documentation

First, aftermarket parts books commonly transpose part numbers. I’ve seen a 0482-xxx swapped with a 0484-xxx on a pilot line — costs you a morning and a restock fee. Second, the OEM catalog includes compatibility notes that no third-party publisher copies. The flags for interchangeability are only in this Hitachi Sumitomo factory file. Third, the 451-page count covers every fastener bracket and hose clamp in the upperstructure, undercarriage, and front piping. Missing a clamp on the main piping (1) section means a hydraulic line chafes through. That’s a fire risk. OEM detail is safety insurance. If you want a broader look at how these excavators fit into the construction equipment market, check the Automotive Industry Overview for context on machine evolution, but for part numbers, stick to the factory source.

Get the Right Part Number the First Time

Open the catalog to any section — say, SWING DEVICE. You’ll see the swing motor, the reduction gear, the brake valve, and all the individual bolts with Hitachi part numbers. No vague descriptions like “gear set.” You get the exact 10-digit code. Cross-check it against your machine’s product identification number (PIN) from page 2 of the catalog. If your PIN falls in a range where a design change occurred, the catalog shows the cut-in date (D for month/year). For example, if a fan valve changed in D03/09, you order the later part. The Internal Combustion Engine page on Wikipedia won’t give you that — only the factory catalog will. When you go to order the replacement valve for your ZAXIS870H-3, you pull the part number from the FAN VALVE (FOR OIL COOLER)(REVERSE TYPE) page. You hand that to the dealer. He scans it. Job done.

Frequently Asked Questions

Can I use this catalog to order engine internal parts like pistons or rings?

No – engine internal parts are in a separate engine parts catalog. This one only covers engine mounting, piping, and accessories.

What do the compatibility symbols Y, I, T, P mean on page 3?

Y means the new part is fully interchangeable with the old one without restrictions. I means you can use the substitute part number shown in the substitute column in place of the original, but you cannot go the other way (the original cannot replace the substitute). T means interchangeability only when used together as a set — example: a pump housing and its matched cover must be replaced as a pair. P means the original part is prohibited from use; you must order the substitute part number listed. The substitute column also shows the quantity for the replacement. Always check the symbol before ordering, especially on parts with I or P flags — ordering the wrong version will land you a box that doesn’t fit your serial number range.

If you’re tired of cross-referencing aftermarket PDFs that leave out half the notes, this catalog is your path. The part numbers are correct. The diagrams are correct. The compatibility flags are correct. Access the Factory Manual from AutoRepairManuals today and keep it on your tablet next to the workbench.

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