Description

Clark-hurth 125B 1979 Parts Catalog – Factory OEM Parts Manual

If you’re trying to order parts for a Clark-hurth 125B Michigan tractor shovel without the factory Parts Catalog, you’re wasting time. I’ve seen too many guys buy the wrong seal, the wrong bearing, the wrong entire assembly because they guessed from a third-party drawing. This is the OEM book from 1979, all 323 pages of it, printed by Clark Equipment Company. It tells you exactly what part number goes where, down to the serial number break. No reprint nonsense, no aftermarket interpretation. Just the factory data.

How to Use This Parts Manual

The manual uses an alphabetical grouping system: Axle (A), Brakes (B), Frame (F), Transmission (T), and so on up to Y. Optional equipment lives in group Z. Every page within a group has a letter prefix and its own number — A1, B1, F1, etc. If a page gets revised, you’ll see a dash and a new suffix, like A1-2. That tells you the part callout changed. You need your machine’s serial number to know which revision applies. The serial number appears as a footnote on the page. Ignore that, and you might order the wrong revision of a part. Page 1 of the manual lays all this out — read it before you flip anywhere else.

Serial Numbers: Why They Matter

Every illustration in this catalog has a serial number reference. Look for an asterisk (*) on the page title — it means the serial number footnote is mandatory. For example, a torque converter seal changed at serial number 125B-XXXX. If you don’t check that, you’ll get a part that doesn’t align with your housing. I see that mistake in my shop at least twice a year. Save yourself the return shipping. Cross-reference your serial number against the footnotes on every page.

Period.

3 Things to Check Before Ordering Parts

• Model and serial number — stamped on the machine’s data plate. Write it down before you open the catalog. The manual is specific to the 125B; don’t try to use it for a 125 or 125C.
• Part number, description, quantity — the manual gives you all three. Ordering by description alone leads to mix-ups. Use the factory number.
• Shipping instructions — Clark’s own instructions say to provide complete shipping details. Missing that means delays. The manual spells it out on page 2.

Alphabetical Parts Groups: What’s Inside

Groups cover every system on the machine: Axle assemblies, brakes, frame components, transmission, hydraulic system, electrical, and more. Each group has its own set of exploded diagrams with callout numbers that match the parts list. The illustrations are typical examples — they show the arrangement, not the exact assembly order. That’s fine for a parts catalog. You’re here to identify what you need, not how to rebuild it. For rebuild procedures, you want the service manual, not this catalog. But if you need a part number, this is your only source.

Warranty and OEM Parts Policy

The manual includes the original warranty from Clark Equipment Company: six months or 1,000 hours, whichever comes first, for defects in material and workmanship under normal use. That warranty is long expired on a 1979 machine, but the policy tells you something important — Clark insisted on using “Original Equipment Replacement Parts.” They said it right there in the manual. Aftermarket parts might look the same on a screen, but the dimensions, heat treat, and material specs can be off. Stick with the part numbers in this catalog and you’ll get the right fit.

FAQ

Does this catalog include torque specs?

No. This is a parts catalog, not a service manual.

How are parts organized?

The manual groups parts alphabetically by system — Axle (A), Brakes (B), Frame (F), Transmission (T), and so on through Y. Each page has a letter prefix and serial number footnotes that tell you which revision applies to your machine. You need your machine’s serial number to match the right revision. Page 1 of the manual explains the grouping system in detail. Without that serial number, you risk ordering a part that doesn’t fit the build date of your tractor shovel. The alphabetical index at the front helps you jump to the right group fast, but always double-check the footnotes before you write down a part number. The illustrations are typical representations — they show the shape and position of parts, not the exact assembly sequence. If you’re looking for a specific nut, bolt, or seal, the group Z optional equipment section might also have what you need. This organization is standard for Clark parts catalogs from this era, and it works well once you get used to the letter system.

Can I use this for a different model?

No. This catalog is specific to the Clark-hurth 125B Michigan Tractor Shovel. Different models have different part numbers and serial number breaks.

Is there a warranty section?

Yes, the manual includes the original warranty policy from Clark Equipment Company — covers defects in material and workmanship for 6 months or 1000 hours, whichever first. But that’s historical; don’t expect to claim it now. It’s still useful to see what Clark considered acceptable.

Related Manuals

• Clark 125B Michigan Tractor Shovel Parts Manual No. 3126″>Clark 125B Michigan Tractor Shovel Parts Manual No. 3126
• Clark-hurth L320 1991 Parts Catalog – 690 Pages OEM Specs”>Clark-hurth L320 1991 Parts Catalog – 690 Pages OEM Specs
• Clark-hurth 85III 1965 Parts Catalog – Factory OEM Specs”>Clark-hurth 85III 1965 Parts Catalog – Factory OEM Specs

For more context on how OEM parts catalogs fit into the broader industry, see the Automotive Industry Overview”>Automotive Industry Overview and the Internal Combustion Engine”>Internal Combustion Engine page for background on powertrain components.

You’ve got a machine to fix. Get the right part the first time. Access the Factory Manual now.