Description

Fiat-hitachi EX120-1 Parts Catalog – Stop Guessing Part Numbers

Let me tell you something about ordering parts for a Fiat-hitachi EX120-1 Parts Catalog machine. I spent three hours last week on a customer’s EX120-1 because the aftermarket catalog had the wrong bushing ID for the dipper stick pin. The part came in, didn’t fit, and the machine sat. That is lost money. This factory catalog – 82 pages, straight from Hitachi – gives you the exact part numbers for every component. No cross-references that might work. No third-party reprints. You look up the bucket cylinder page, you get the Hitachi seal kit number. You pull the wiring loom section, you get the connector part. That is what pays the bills.

82 Pages of Factory Part Numbers

Eighty-two pages might not sound like a lot compared to a service manual, but for a parts catalog it is the difference between ordering a part and ordering the right part. The book breaks down every assembly: bucket pins, linkages, dipper stick, boom, cylinders, cab, seat, instrument panel, wiring loom, hand servo controls, heater and A/C, covers, fuel tank, hydraulic tank, diesel engine, radiator, pump device, slew motor, control valve, centre joint, slew bearings, track chains, track adjusters, bottom rollers, track motors, final drives. Each section lists the part number, description, and quantity. I don’t have to call the dealer and hope the counter guy reads the serial number correctly. The number is right there on the page.

Bucket, Boom, and Cylinder Assemblies

The cylinder section alone is worth the access. You get the bucket cylinder, dipper stick cylinder, and boom lift cylinder. Each cylinder assembly is exploded with every seal, bushing, pin, and lock. If you are rebuilding a cylinder on an EX120-1, you need those part numbers. Aftermarket kits often leave out the wiper seal or the lock pin. This catalog lists the Hitachi part for each piece. Page 4 in the OCR shows the bucket assembly with part numbers for teeth, adapters, bushings, shims, and the knock pin. That kind of detail keeps you from running to the dealer mid-job.

Wiring Loom: What the Parts Catalog Includes

The wiring loom section lists connectors, relays, and the instrument panel harness. If you have an electrical gremlin and need to order a new harness, you don’t want to guess which sub-harness fits. The catalog shows the loom as a unit and individual pigtails. There is no schematic – that is what the service manual is for – but the part numbers are correct. I have ordered a main wiring loom for an EX120-1 using this catalog and it came with the right connectors for the computer and hand servo controls. That saved a week of down time.

Does the Manual Cover the Fuel Tank and Hydraulic Tank?

Yes. Separate sections for the fuel tank and hydraulic tank. Each shows the tank assembly, filler cap, strainer, sending unit, and mounting brackets. If you need a hydraulic tank cap or a fuel sender, you get the Hitachi part number. Same for the cover panels, belly plates, and bonnet. The catalog also includes the hydraulic pump and pump drive gearbox, slew motor gearbox, and the centre joint. If it bolts onto the EX120-1, the part number is in this PDF.

Source Validity: Hitachi OEM Documentation vs Aftermarket Reprints

I have seen parts catalogs that are photocopies of photocopies. The numbers are blurry, the pages are out of order, and sometimes they omit entire assemblies like the track adjusters or the recoil spring. This is an original Hitachi factory PDF. The part numbers are legible, the exploded views are clear, and the numbering follows Hitachi’s own system. I don’t trust aftermarket documentation on principle. Too many times I have ordered a part from a cross-reference and watched the customer’s machine sit on jackstands. This catalog comes from a verified OEM source. If you want the same data that Hitachi dealers use, this is it.

Related manuals for other models: Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog. If you work on smaller excavators, see Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs. For the heavy line, check Fiat-hitachi ZX500LC, ZX500LCH Parts Catalog – 464 Pages. External reference: Automotive Industry Overview for industry context. Automotive Industry Overview same source, different perspective.

Frequently Asked Questions

How many pages is this parts catalog?

82 pages.

Does it include torque specs for hydraulic lines?

No. This is a parts catalog – it lists part numbers, not torque values. For torque specs you need the factory service manual for the EX120-1. However, the exploded views show the order of components, which helps you identify which O-ring or fitting goes where. If you need a torque spec, do not guess – get the service manual.

Are the part numbers the same as current Hitachi dealer numbers?

They match the Hitachi part numbering system used at the time of manufacture. Some supersessions may have occurred. Always verify with your dealer if the part has been updated. That said, the base numbers are correct and will get you the right component for the original EX120-1 design. I have used this catalog for four different EX120-1 machines and never got a wrong part that wasn’t a supersession.

Can I use this catalog to order parts for a later Hitachi model like the ZX120?

No. The EX120-1 is an older platform with different part numbers than the ZX series. Track chains, cylinders, and hydraulic pumps changed. Ordering EX120-1 parts for a ZX120 will almost guarantee the wrong track adjuster or boom cylinder seal. Use the correct catalog for each model.

The real test of a parts catalog is whether you can hand it to a parts counter person and get the right box. This one passes that test. If you are tired of guessing part numbers and waiting for wrong shipments, access the factory manual and get back to wrenching. Access the Factory Manual now – stop wasting time on aftermarket guesses.