Description

Fiat-hitachi EX300-3C, EX300LC-3C, EX310H-3C, EX310LCH-3C Parts Catalog

If you’ve ever ordered a part for a Fiat-hitachi EX300-3C and got the wrong seal, wrong bearing, or a valve that didn’t match the bolt pattern, you know the problem. Aftermarket catalogs guess. They combine serial numbers, skip revisions, and leave you holding a box of scrap metal. This is the factory Parts Catalog – the same binder that sat on the dealer parts counter. 104 pages, no guesswork. You look up the part number, you order it, it fits. Period.

Want to know what’s inside? The table of contents reads like a hydraulic surgeon’s checklist: Pump single, regulator, gear pump, motor oil swing and travel, brake valve, relief valve, servo piston. Then the valve section – control valves split into four sub-sections, pilot valves, solenoid valves, shuttle valves, FC valve, lock valve, check valve, slow-return valve, rotary valve. Cylinders: boom right, boom left, arm, bucket, and even a bucket section for river maintenance variants. This isn’t a quick reference. It’s a complete parts breakdown.

Valve and Brake Coverage: What the Catalog Includes

The Brake section shows you the exact relief and shuttle components for the travel motor. You get the factory drawing with callouts for every shim, spring, and piston. Page references are embedded in the index so you can find the Valve breakdown for your specific machine model – EX300-3C, EX300LC-3C, EX310H-3C, or EX310LCH-3C. I’ve seen techs waste half a day hunting for a brake valve part number because they trusted a generic list. This kills that waste.

104 Pages of OEM Part Numbers

The whole document is 104 pages. That’s lean by factory standards – no filler, no obsolete assembly drawings. Every page has exploded diagrams with reference numbers tied to a parts list. Want the servo piston for the travel motor? Flip to the MOTOR;OIL section, find the TRAVEL subsection, locate the piston assembly. The part number is right there. No guessing if a superseded number fits your serial number range – the catalog shows the applicable serial number break on page 3. Check your machine plate. Order the right part.

Does This Manual Cover the EX300-3C Series?

Yes. The foreword (page 5 of the PDF) explicitly lists EX300-3C, EX300LC-3C, EX310H-3C, and EX310LCH-3C. It also notes that the parts catalog includes hydraulic equipment precision components. The back of the book has a parts index sorted numerically. If you find a part number with an asterisk, that’s a new addition – design changes happen. The manual accounts for them. For context, this is the same format used for construction equipment globally. You can read more about the Automotive Industry Overview for background on how OEM catalogs differ from generic ones.

Pump and Motor: Detailed Breakdown

PUMP section splits into single pump, regulator, and gear pump. The MOTOR;OIL section covers swing motor and travel motor. Each motor illustration shows the valve brake and relief valve assemblies. If you’re rebuilding a travel motor, you need the relief valve shim stack data. It’s in the VALVE; RELIEF sub-section. I’ve seen guys reuse shims because they couldn’t find the spec – that’s how you get weak brakes on a slope. Don’t do it.

Parts Index: Faster Ordering, Fewer Errors

The index at the back lists every part number in the catalog with a page reference. If you have a part number from the machine, go straight to the index, find the page, and see the assembly context. This avoids ordering a part that looks right in the parts counter computer but belongs to a different sub-assembly. For related machines, check the Fiat-hitachi 850-3, 850LC-3, 870H-3, 870LCH-3 Parts Catalog and the Fiat-hitachi ZX50U-2 Parts Catalog – 120 Pages of OEM Specs if you work on smaller machines. For larger excavators, the Fiat-hitachi ZX500LC, ZX500LCH Parts Catalog – 464 Pages covers those models.

Source Authenticity: Why OEM Matters

This is a factory Fiat-hitachi document, not a third-party reprint. The page headers say “PARTS CATALOG” with the model numbers and serial number range 10001~. The Japanese and English dual-language layout matches genuine dealer copies. Aftermarket catalogs copy the drawings but often skip the service code column – the W, D, K, R, S, OP, OS, US codes that tell you if a part requires local modification or is a service kit. Missing those codes costs time. This manual has them all. For more on the standards that drive these codes, refer to the Automotive Industry Overview for context on OEM documentation practices.

Can I use this manual to identify parts for my EX310H-3C?

Yes. The catalog covers EX310H-3C and EX310LCH-3C alongside the EX300-3C models.

Does it include torque specifications?

No. This is a parts catalog – it lists part numbers and exploded views, not assembly torque values. You need the service manual for that.

How do I find a brake valve part number?

Go to the VALVE; BRAKE section under MOTOR; OIL. The drawing shows each component. Match the part number from the diagram to the parts list.

What if my serial number falls outside the listed range?

The catalog states Serial No. 10001~. If your machine is newer, you may need a supplement. Contact a dealer. The manual still covers most hydraulic component part numbers up to that point.

This is the document you need on the bench when you’re sourcing seals, valves, or complete cylinder assemblies. It eliminates the back-and-forth with the parts counter because you already have the factory number. Access the Factory Manual and put it in your digital library – your future self will thank you when the EX300LC-3C travel motor starts leaking and you need the right brake valve seal overnight.