FIAT Kobelco K904 II, K904L II 1989 Parts Catalog

If you’re ordering parts for a K904 II or K904L II and you’re using an aftermarket list or a photocopy, you’re gambling with machine downtime. I’ve seen two different seal kits for the same boom cylinder because someone read the serial number wrong. This FIAT Kobelco K904 II, K904L II 1989 Parts Catalog is the original factory document – 298 pages of part numbers, exploded views, and application ranges that match your machine’s serial plate. No substitutions. No “close enough.”

Serial Number Application: YW-0101~1118 and LX-1501~1525

Every parts catalog has a specific range. This one covers K904 II units with serial numbers YW-0101 through YW-1118, and K904L II units from LX-1501 through LX-1525. If your machine falls outside these ranges, you’re looking at a different edition. Page 5 of the catalog gives you space to record machine and engine serial numbers – a habit I hammer into every tech who touches a backhoe. Write it down. Use it. Then order the right part the first time.

298 Pages of Factory Part Breakdowns

Two hundred ninety-eight pages. That’s the thickness of a manual that hasn’t been gutted by reprinters. Each section breaks down every assembly on the hydraulic excavator – from the engine mounting bolts to the final drive seals. The illustrations are line drawings done by Kobelco’s engineering group, not a third-party shop. You get the exact orientation of bushings, the correct bolt lengths, and the part numbers that haven’t been superseded. If you’re rebuilding the final drive on a K904 II, you need the dust seal part number from this catalog. Don’t trust a generic list.

Why OEM Documentation Beats Aftermarket Reprints

Aftermarket parts catalogs usually scan an old original, crop out the margins, and lose the fine print. The part numbers get blurred. The application tables are missing. This 1989 edition from FIAT Kobelco was printed on Kobe Steel’s press – the same company that built the machine. The book code is S4YW1503-01. You won’t find that on a third-party disc. When you call a dealer for a hydraulic hose assembly for a K904L II, you read them the part number from page 73 of this catalog (if that’s where the figure is). They’ll ship the right one. No returns. No wasted freight.

5 Sections That Save You Time at the Parts Counter

This catalog is divided into major systems: engine group, hydraulic pump and control valves, swing mechanism, track and undercarriage, and cab and electrical. Each section starts with an exploded diagram and ends with the numerical index. I’ve used this exact document to find a missing O-ring on a K904 II’s swing motor after someone lost the factory seal. The diagram showed the exact groove, and the part number matched the superseded update. Try doing that with a scanned PDF from an unknown source.

Who Needs This Catalog

DIY equipment owners, small fleet operators, and any mechanic who works on 1980s-vintage Kobelco excavators. If you’re buying a K904 II or K904L II used, this catalog is your insurance against buying the wrong hydraulic filters, drive sprockets, or track pins. Beginners: you can use the exploded views to learn how the machine is assembled before you even touch a wrench. Professionals: you already know that the parts catalog is the first tool you reach for when the serial number is weathered.

Related Manuals You Might Need

If your shop also handles newer Kobelco models, check out FIAT Kobelco ED150, ED150-IE 2013 Parts Catalog OEM for the ED150 series, or FIAT Kobelco ED150, ED150-2 2009 Parts Catalog OEM Manual for the -2 revision. For the LK650-II, FIAT Kobelco LK650-II 1992 Parts Catalog – OEM Factory Specs covers that platform. For background on how hydraulic excavators evolved, see Automotive Industry Overview and Internal Combustion Engine for engine technology contexts.

Frequently Asked Questions

Does this catalog include torque specs or repair procedures?

No. This is a parts catalog, not a service manual. It lists part numbers, quantities, and exploded views for ordering. For torque values, you need the separate K904 II service manual.

How do I know if my machine serial number is covered?

Look at the plate on your backhoe. For K904 II, the range is YW-0101 to YW-1118. For K904L II, it’s LX-1501 to LX-1525. If your serial falls outside those, you need a later edition. The catalog’s first page lists the ranges.

Can I use this catalog for the K904-I or K904L-I?

Not directly. The -I models have different hydraulic plumbing and a different final drive. The -II revision changed several part numbers. Using this catalog on a -I machine will give you wrong parts. The book code S4YW1503-01 is specific to -II.

Is this an original OEM document or a reprint?

The document you get is a high-resolution scan of the original 1989 printed catalog, published by Kobe Steel under the FIAT Kobelco brand. It includes the original cover, page numbers, and copyright notice from Kobelco Construction Machinery America, LLC. It is not a third-party recompilation.

The difference between a machine that runs for 10,000 hours and one that gets sidelined by wrong parts often comes down to this 298-page document. Don’t guess your way through a parts order. Download the Factory Manual and keep it on your tablet or print the pages you need.