Koehring 6608 1991 Parts Catalog – OEM Parts Identification

Description

Finding the right part for a Koehring 6608 1991 Parts Catalog hydraulic excavator can shut down a job fast if you’re flipping through a third-party catalog with misprints. Aftermarket parts lists skip serial-number splits and leave you with a bucket of wrong gaskets and seals. This OEM Parts Catalog from 1991—123 pages of factory-issued part numbers—puts the correct information on your bench.

Crawler & Carbody to Electrical System: 14 Parts Groups Covered

Page 2 of the catalog lays out the parts group index. You get Crawler & Carbody (group G), Upper Structure, Turntable, Counterweight, Upper Engine & Fuel Tank, Swing System, Pump Drive, Hydraulic System (group 25), Operator’s Cab (27), Controls (28), Mirrors, Marking, Heating & Air Conditioning, Electrical System, Tools, Excavator Attachment, Blade Attachment, and Attachment Options. Every major system on the Koehring 6608 is represented. If you need a hydraulic line, you turn to group 25. If it’s an electrical component, group Electrical System. No hunting through generic illustrations that don’t match your machine’s serial number.

What Makes This Parts Catalog Different From Aftermarket Versions?

Aftermarket parts books often copy from a single revision and miss the mid-year changes. The Koehring factory manual is printed from the original plates, revised 9-91. It lists serviceable parts for every machine built of this model designation, using serial numbers to identify when a product improvement changed the part. Page 3 of the manual tells you: “KNOW THE SERIAL NUMBER OF YOUR MACHINE before searching for replacement parts.” That’s not a suggestion—it’s how you avoid buying the wrong pilot control valve or engine mount. The same page explains that a letter suffix (like 25A) indicates variable or optional parts groups. This is the level of detail that aftermarket catalogs skip, and it’s why you see technicians walking parts back to the counter.

123 Pages of Factory-Validated Part Numbers

Each page is numbered by group and sequence (e.g., 25.1, 25.2). Exploded view illustrations show the relationship of assembled parts, keyed to an accompanying parts list on the same or facing page. A numerical parts list at the front of the manual cross-references every part number in numerical sequence to the page where it appears. This means you can start with an old part number and find the current replacement, or verify if a part is still serviceable. No aftermarket approximations—only factory-sourced numbers. For context on why OEM documentation matters in the Automotive Industry Overview, consider that a mismatched seal in a hydraulic system costs you downtime and a cleanup bill.

Use the Serial Number to Get the Right Part

Before you flip to any group, locate your machine’s serial number. The manual covers beginning w/ser. no. 193501-1 and 193670 w/hyd pilot controls. If your unit falls outside that range, you may need a different edition. Page 3 emphasizes this because Koehring made running changes. The parts catalog respects those splits. For example, the fuel system components might differ between early and late 1991 production. The exploded views in the Upper Engine & Fuel Tank section show exactly which fuel lines and tank brackets apply to your serial number. Use the numerical list to cross-check before ordering. Koehring 6608 Hydraulic Excavator Parts Catalog is the anchor for further related references.

Hydraulic System: Group 25 Breakdown

Group 25, the hydraulic system, starts on page 25 of the catalog. If you’re tracking down a control valve, pump, or cylinder seal kit, you’ll find the exploded view and part numbers there. The pump drive section is a separate group, so the hydraulic system group focuses on lines, valves, and actuators. Each component is numbered with its Koehring part number. No generic “replace with equivalent” nonsense. You get the factory stamp. That’s the difference between a rebuild that lasts and a leaky mess after 50 hours.

Factory specs only.

For owners of other Koehring models, these related catalogs follow the same OEM standards: Koehring T-S44, 644 1974 Parts Catalog – Factory OEM Parts Reference and Koehring S-155 1977 Parts Catalog – Factory OEM Parts Reference.

Does this catalog include repair procedures?

No. It is a parts catalog – it lists serviceable parts with exploded views and part numbers, not step-by-step repair instructions.

How do I find a part number if I only have the old number?

The numerical parts list at the front of the manual lists all part numbers in sequence and cross-references them to the page where they appear. On page 3, the manual explains that you can verify whether a part is still serviceable or if there is a current replacement. Start by locating your old part number in that list; if it has been superseded, the catalog will show the new number and the group page with the exploded view. This is especially important for the Koehring 6608 because serial number breaks in 1991 changed several components in the engine and fuel systems.

If you’re working on a Koehring 6608 and need to order parts with confidence, this 1991 factory parts catalog gives you the actual numbers from the manufacturer. Stop guessing and start ordering correctly the first time. Automotive Industry Overview underscores why OEM documentation remains the standard for heavy equipment repair. Access the Factory Manual now.