Description

Fiat-hitachi EX400-3, EX400LC-3, EX400H-3, EX400LCH-3 Parts Catalog

If you’re ordering parts for one of these machines and don’t have the factory breakdown in front of you, you’re gambling with someone else’s money. I’ve seen shop orders come in with wrong part numbers because some tech guessed off a third-party PDF. That costs time. That costs seals. That costs a Saturday. This Fiat-hitachi EX400-3, EX400LC-3, EX400H-3, EX400LCH-3 Parts Catalog is 214 pages of OEM-verified part numbers, exploded views, and service codes. It’s the same binder the dealer parts counter uses. No reprints. No aftermarket re-draws.

Pump Section – Piston, Gear, and Regulator

Starts with the main hydraulic pump. You get separate pages for the piston pump assembly, the gear pump, and the regulator. The regulator section includes the reducing valve and tilting-probing unit. Each part has a unique number and a location callout on the drawing. I’ve used this to order a regulator seal kit without pulling the whole pump. The service codes (W, D, K, R, S, OP, OS, US) tell you exactly what you can swap individually and what needs a whole subassembly. That alone saves you opening a box of parts that won’t fit.

Motor and Brake – Swing and Travel

Oil motor sections cover swing and travel. The travel motor is split by serial number range: H00101–H00746 and H00747 onward. Each gets its own exploded view and parts list. The valve ; brake section appears right after the travel motor – a separate brake valve assembly with its own part numbers. If you’re chasing a drift issue on the tracks, you go straight to this page. The brake valve is a common failure point when the machine gets old. Having the OEM part number means you don’t end up with a generic cartridge that has the wrong cracking pressure.

Valve Systems – Control, Pilot, Shuttle, Solenoid

This is the biggest chapter in the catalog. Control valves broken down by serial number range: 05001–05422 and 05423 onward. Each control valve section is split into five sub-pages because these spool stacks are deep. Then you get pilot valves (front & swing, travel, and two serial breaks), FC valves, shuttle valves, solenoid valves, check valves, lock valves, and holding valves for boom and arm. The holding valve page for the boom is separate from the arm. That level of detail is what you need when you’re staring at a valve block with six ports and no label.

Cylinder Breakdown – Backhoe and Loader Attachments

Both backhoe and loader cylinders are covered. Boom cylinders (left and right), arm, bucket, and even level cylinders for the loader. There’s a separate page for the bucket cylinder with long arm option. Each cylinder assembly lists the barrel, rod, piston, seals, and all the hardware. If you’re rebuilding a cylinder, you can order every bushing and seal individually. The parts index at the back lets you cross-reference any number in seconds.

214 Pages of Factory Data

That’s the page count. Not 150 pages with generic drawings. The parts index starts after the cylinder section and runs to the end. Every page is a scan of the original Japanese/English catalog. You get the part number, name, quantity per machine, and service code. The front matter explains how to read the catalog – figure number, part number, name, quantity per set. It also tells you where to find the machine serial number (plate on the lower right of the cab). That’s the kind of detail that keeps a $400 order from turning into a restocking fee.

Who Needs This Catalog?

If you own a Fiat-hitachi EX400-3, EX400LC-3, EX400H-3, or EX400LCH-3 and do any of your own maintenance, you need this. Also useful for shop parts managers who order for multiple machines. The backhoe/loader split matters if your machine has both attachments. The serial number splits matter if you have an early or late production unit. Without this, you’re guessing – and guessing on hydraulic parts is expensive.

OEM vs. Aftermarket – Why This Is Different

This is a direct scan of the factory-published parts catalog. Hitachi printed this. The aftermarket catalogs I’ve seen for these machines have redrawn diagrams that miss a bracket or combine two different revisions into one drawing. The OEM version shows the exact layout at the time of manufacture. If you need a part that was superseded, the service code S tells you it’s a service-only part. That information disappears in reprints.

How do I find the part number for the brake valve on a travel motor?

Go to the Motor ; Oil section. Find the travel motor for your serial number range. The brake valve subassembly is listed right after the motor pages. Each component has its own part number and quantity.

Does this catalog include wiring diagrams or torque specs?

No. This is a parts catalog – exploded views, part numbers, quantities, and service codes. It does not contain torque specs or repair procedures. You need the service manual for those. This catalog lives beside the service manual on the bench.

Access the Factory Manual. Put it on a tablet or print the section you need. When you call the dealer, you’ll read them the part number off the page instead of describing the part. That’s the difference between a correct order and a return.

Related Manuals: HITACHI EX400-3 Series Parts Catalog, Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog, Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs

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