Description

Koehring 266 Parts Catalog – Factory OEM Parts Reference

Koehring 266 Parts Catalog – if you’re hunting down a replacement fuel line or a swing motor seal for a 266 hydraulic excavator, you need the exact part number. Aftermarket catalogs often skip the serial number splits. You end up with a part that doesn’t fit. This factory PDF is 108 pages of exploded views and parts lists keyed directly to serial numbers 66100 and up. No reprints, no aftermarket re-publishing. Just the original OEM data.

What This 108-Page Parts Catalog Actually Covers

Every major system on the Koehring 266 is broken out into groups. You get crawler & carbody (group 2), upper structure with turntable and fuel tank (page 12), counterweight, upper engine (page 14), clutch, swing system, pump drive case, hydraulic system – the list goes on. There’s operator’s cab and machinery housing, controls, guards, rails, steps, mirrors, catwalks, marking, heating and AC, electrical, horn, wiper, floodlights, accessories. Even tools, paint, and lubricants. And the excavator attachment, clam & dragline, and attachment options are covered. That’s real coverage.

Why OEM Data Matters for the 266 Hydraulic Excavator

I’ve seen guys pull a “compatible” part number from a general parts site and end up with a sprocket that’s 2mm off. With the 266, the serial number determines which revision of the fuel tank bracket or engine mount you need. This catalog lists every serviceable part for every machine built of this model designation. It uses a group number with letter suffixes for variables – group 125A for optional hydraulic components, for example. If you don’t have the factory index, you’re gambling. For context on why automotive and heavy equipment documentation follows strict standards, check Automotive Industry Overview and Automotive Industry Overview.

Fuel and Engine: Two Critical Sections

The fuel tank group (page 12) shows every line, bracket, and fitting with part numbers. The upper engine group (page 14) covers the Cummins diesel assembly – mounts, pulleys, gaskets. Both sections reference the serial number range so you order the right revision. The engine group index also tells you if there’s a letter suffix (14A, 14B) for later modifications. That kind of detail keeps you from buying a pump drive case gasket that doesn’t match your machine’s build date.

Using the Numerical Parts List and Exploded Views

Flip to the front of the manual. There’s a numerical parts list – all part numbers in sequence, keyed to the page where they appear. That cross-reference tells you if a number is still valid or has been replaced. The exploded view illustrations are right beside the parts list on the same or facing page. No flipping back and forth. Each page number is within a group – for example, group 25 (hydraulic system) starts with 25.1, 25.2, etc. Letter suffixes (25.2A) show revisions. Easy to track if your manual has been updated.

Serial Number Ranges: The Most Overlooked Step

The very first thing you do before ordering anything: know your machine’s serial number. This catalog is for serial 66100 & up. If your 266 is older, you need a different book. The manual even says: “Knowledge of the serial number of your machine before searching for replacement parts is required.” I’ve had a tech ignore that and order five fuel filters that didn’t fit. Don’t be that guy.

Related Manuals

If you work on other Koehring models, these factory catalogs will save you the same headaches: Koehring T-S44, 644 1974 Parts Catalog – Factory OEM Parts Reference, Koehring S-155 1977 Parts Catalog – Factory OEM Parts Reference, Koehring 366 Hydraulic Hoe Parts Catalog – OEM Factory Specs.

Frequently Asked Questions

Does this catalog cover the hydraulic system?

Yes, Group 25. Exploded views for pump drive, valves, lines – all keyed to serial number.

Can I use this to order parts for a 266 with serial below 66100?

No. This catalog is specifically for serial numbers 66100 and up. For earlier machines, you need the corresponding earlier parts catalog to match the fuel tank bracket and engine mounts.

What is the difference between Group 27 and Group 28?

Group 27 covers the operator’s cab and machinery housing – the structure, windows, doors, insulation. Group 28 covers the operator’s controls inside the cab – levers, pedals, switch panels. They are separate assemblies and have their own exploded illustrations.

Are torque specifications included?

No. This is a parts catalog, not a service manual. Torque values belong in the maintenance manual.

If you’re working on a 266, stop wasting time on mismatched parts lists. Access the Factory Manual and get the real data.