Description

Koehring S-155 1977 Parts Catalog – Factory OEM Parts Reference

I’ve seen guys waste half a day trying to match a hydraulic line on a Koehring S-155 because they were using aftermarket cross-references from a third-party site. That’s time you don’t get back, and parts that don’t fit cost real money. This Koehring S-155 1977 Parts Catalog is the original OEM document – 194 pages of factory part numbers, exploded views, and the exact group index the manufacturing plant used. If you work on one of these Hoekruisers, you need this on your bench, not a generic PDF.

Group Index: 18 Sections of Factory Parts

The catalog is split into 18 groups, each corresponding to a major system. Group 2 covers stabilizers, group 3 the superstructure and enclosures, group 4 the swing reducer, group 5 the hydraulic system, group 7 cab and controls, group 8 electrical, group 9 accessories, group 10 universal attachment, group 11 excavating attachment, group 12 attachment options, group 13 engine and fuel tank, group 14 transmission and drive shafts, group 15 axles, group 16 wheels and tires, group 17 brakes, group 18 steering. The part numbers are tied to the original Koehring Bantam Division – Waverly, Iowa. When you order parts, you need the serial number and the exact name from this catalog. Page 1 gives you the ordering address and reminds you to “ORDER PARTS FROM THE KOEHRING CRANE & EXCAVATOR MANUFACTURING PLANT”. That’s not optional.

Engine, Fuel Tank (Group 13) – Fuel System Details

Group 13 is where you find the engine components and the fuel tank assembly. If you’re chasing a fuel leak or need a new fuel line bracket, the part numbers here are the ones Koehring used on the assembly line. No guesswork with aftermarket equivalents that leave you half an inch short. The catalog lists each part with the OEM part number, quantity required, and a reference number that ties to the exploded drawing. For the S-155, the fuel tank is located in the rear section, and the mounting brackets are unique. Don’t try to adapt a generic tank – get the factory numbers from group 13.

Electrical System (Group 8) – Wiring and Components

Group 8 covers the entire electrical system: alternator, starter, wiring harnesses, switches, and lights. The 1977 S-155 uses a 12-volt negative ground system, but the wiring routing and connectors are specific to the Hoekruiser. If you’re replacing a headlight switch or tracing a short in the cab, you need the correct part numbers. One misordered switch can delay the job by a week. This catalog gives you the factory numbers so you can order from Koehring or cross reference with confidence. No aftermarket parts catalog will show you the exact bracket or harness length – this one does.

Transmission, Drive Shafts (Group 14) – Driveline Parts

Group 14 lists the transmission assembly, drive shafts, and related hardware. The S-155 uses a heavy-duty transmission with specific seals, bearings, and shift components. If you’re rebuilding the transmission or replacing a u-joint, the part numbers in this section are the only ones guaranteed to fit. The drive shaft lengths and spline counts are documented. On page 3 of the catalog (sample shown in the OCR), you can see the level of detail: every capscrew, nut, and self-tapping screw is listed with thread size and length. For the transmission group, the same precision applies. Don’t trust a used part without checking the factory number first.

Why OEM Parts Catalogs Beat Aftermarket

Third-party parts books for the Koehring S-155 often have incorrect cross-references or skip entire groups. I’ve seen aftermarket listings that combine engine parts from a different model, causing a wrong oil pan gasket. This catalog is the original Koehring publication, printed in 1977. The part numbers are the ones stamped on the original components. If you’re a shop owner or a DIY owner-operator, using this means you order the right part the first time. No returns, no downtime. The manual also includes the general information section at the end, covering serial number identification and ordering procedures. For context on why factory specs matter in the heavy equipment industry, check out the Automotive Industry Overview and Automotive Industry Overview for background on manufacturing standards. But for this specific machine, the catalog is your only reliable source.

Who Needs This 1977 Parts Catalog?

If you own a Koehring S-155 Hoekruiser, you need this manual. Also, if you work at a dealership or independent shop that services these cranes, you need it. The audience isn’t limited to mechanics – parts counter guys, fleet managers, and restoration enthusiasts all benefit. The catalog is 194 pages, printed clearly, with exploded diagrams that show exactly how each part fits. Beginners can use it to identify parts before ordering; experienced techs use it to verify numbers. The manual covers all standard and optional attachments, including the excavating attachment (group 11) and universal attachment (group 10).

Frequently Asked Questions

Does this parts 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 torque specs or overhaul procedures, you need the service manual. But for ordering parts, this is complete.

Will this catalog fit the Koehring T-S44 or 644 models?

No. This is specific to the S-155 Hoekruiser. Other Koehring models have different part numbers. We also carry related manuals: Koehring T-S44, 644 1974 Parts Catalog – Factory OEM Parts Reference, Koehring 366 Hydraulic Hoe Parts Catalog, and Koehring 166 Hydraulic Excavator Parts Catalog.

Can I use this to find a part number for a 1975 S-155?

Yes, if the serial number falls within the range covered by the 1977 catalog. The manual was revised in Feb 1977. For earlier S-155 units, some part numbers may differ. Check your serial number against the general information section.

Is this a digital access or a printed book?

This is a digital PDF format of the original factory manual. You can print it yourself or view it on a tablet. The file is high-resolution scanned from the original 1977 booklet.

If you work on a Koehring S-155, you can’t afford to guess part numbers. This 1977 factory catalog gives you the exact OEM numbers used by Koehring’s Bantam Division. Access the Factory Manual and keep it on your tablet or print a copy for the toolbox. It’s the difference between ordering the right part today and waiting on a return tomorrow.