Description

Fiat-hitachi EX100-2 Parts Catalog

Every time a machine is down waiting on a misordered part, you’re burning money. I’ve seen it a hundred times — a guy orders a pump seal off a generic website, gets the wrong O-ring, then the machine sits another week. This Fiat-hitachi EX100-2 Parts Catalog puts a stop to that. It’s 191 pages of factory-issued part numbers, exploded views, and service codes. No guesswork.

The catalog comes from Hitachi’s own print — not some third-party scan stitched together from blurry PDFs. Section after section breaks down every hydraulic component on the EX100-2 excavator. You want the brake valve for the travel motor? It’s in there. Relief valves, control valves, pilot valves — all covered with individual part numbers and quantities.

Let me give you a sample of what’s inside. The PUMP section lists both single pumps (two pages each) and the gear pump. Next, the MOTOR; OIL section covers travel motors and swing motors, each with dedicated brake valve pages — VALVE ; BRAKE (1/2) and (2/2). You get not just the part numbers but the service code that tells you whether it’s a direct swap or if it needs local machining.

That matters.

191 Pages of Factory Part Numbers

That 191-page count isn’t filler. Half the book is detailed exploded diagrams with a parts index at the back. You cross-reference part numbers — either numeric or alphanumeric — against your machine’s serial number range. The service code column tells you if a part is oversized (OS), undersized (US), optional (OP), or a service kit item (K). Without this catalog, you’re ordering blind. With it, you order once.

Brake Valve and Travel Motor Coverage

The travel motor brakes on the EX100-2 are a common wear item. This catalog gives you the exact brake valve assembly breakdown — you’ll see the difference between the two halves (VALVE ; BRAKE 1/2 and 2/2) and the integral relief valve. Same for the swing motor. If you’re rebuilding a final drive, you need these pages. You also get the rotary group and shaft part sections for the motor internals.

Get the Right Part the First Time

Aftermarket parts catalogs often skip revision levels. Hitachi updated parts during production — the EX100-2 has machine serial number breaks that separate early and late models. This catalog shows those breaks right in the part number list, grouped by serial number range. Look for the compatibility column with I, P, T, Y codes. ‘I’ means you can only replace forward, not backward. ‘P’ means the old part is banned — use the new one. ‘T’ means you need parts in combination. ‘Y’ means fully interchangeable. Don’t learn the hard way when the new part doesn’t fit because you ordered from a generic listing that ignored the revision. That’ll cost you days of downtime and another freight charge.

For background on how third-party manuals deviate from factory specs, read the Automotive Industry Overview.

FAQ

Does this catalog cover the pump section?

Yes. Both single pumps and the gear pump are listed with separate pages, plus the angle sensor.

What do the service codes like W, D, K actually mean?

W means the part requires local machining before installation — contact your dealer. D means the part cannot be replaced individually; you must buy the assembly. K indicates the part is included in a service parts kit. R means quantity varies per machine (like shims). S is a service-only part not installed at factory. OP is optional equipment, OS oversized, US undersized. The codes are explained on page 5 of the catalog and are critical for ordering correctly. Understanding the supply chain of parts is covered in the Automotive Industry Overview.

You can keep guessing part numbers from memory or from aftermarket cross-reference charts. Or you can get the actual factory documentation and stop the parts-chasing. Access the Factory Manual from AutoRepairManuals and keep your EX100-2 running.

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