Description

Clark-hurth 280 III A Parts Catalog – Stop Guessing, Get the Factory Part Numbers

If you’re wrenching on a Michigan 280 IIIA Tractor Dozer, you already know what happens when you order the wrong part. The machine sits. The job waits. And you eat the shipping. I’ve been there. That’s why I keep the Clark-hurth 280 III A Parts Catalog on the bench next to my torque wrenches. Not a PDF from some forum – the actual OEM factory print. 254 pages, straight from Clark Equipment Company. Page 1 tells you where to write your machine serial number so you never mix up revisions. Page 4 lays out the factory warranty terms. This isn’t a reprint; it’s the original parts bible for this dozer.

You get an alphabetical index that walks you through every system. Alternator and belt? Section E27. Air brake valve? Section B12. Transmission breather? Section T3. The index is cross-referenced, so you don’t need to flip through every page. I’ve seen guys bolt on a brake chamber from a different model because they guessed the part number. That’s a safety hazard on a dozer. This catalog eliminates that risk.

Engine, Brake, Valve, Transmission: Four Critical Systems Covered

Let’s talk specific sections. The Engine section covers accessories, aspirator, air cleaner connections – everything from the accessory support parts (E28, E29) to the alternator belt tension specs. The Brake system is fully indexed: air brake pedal (B12), air lines (B5–B9), slack adjuster (A3–A11). I’ve rebuilt those brakes; getting the right air chamber part number saves you a trip to the parts counter. The Valve section – air brake valve (B12) is one, but the alphabetical index also lists air pressure gauge, sender, and reservoir. Finally, the Transmission section covers the accumulator (T20), breather (T3), and all related driveline parts. If you need the axle planetary carrier assembly, it’s on page A20. The manual groups parts by system letter then page, so you can zero in fast.

Why the OEM Factory Print Matters for Your Dozer

Aftermarket parts catalogs are a gamble. They re-draw diagrams, combine models, and sometimes leave out revisions. This manual is from Clark Equipment Company – the same people who built the 280 IIIA. The parts numbers are what came off the assembly line. I’ve had a guy bring me a “compatible” brake valve that didn’t match the mounting holes. Wasted an afternoon. With this catalog, you read the part number, order it, and it fits. The warranty page alone tells you what’s covered. You can’t get that from a third-party scan.

For more context on why OEM documentation beats aftermarket, check out the Automotive Industry Overview. And if you want to understand the power plant under the hood, the Internal Combustion Engine background helps you see why correct engine parts matter for performance and emissions.

How to Navigate the 254-Page Index

The table of contents is alphabetical, not by system number. Look up “Alternator” first, then cross-reference with the page letter. The manual uses a letter-number code: for example, E27 means section E, page 27. The index lists every component – from alcohol injector (Z2, Z3) to battery cables (E12–E16). If you’re searching for support parts for the engine accessory, you’ll find them under “Support Parts E28, E29.” I recommend writing your machine serial number on page 1 as soon as you open the manual. That way, when you call for a part, the dealer has the exact revision. No guesswork.

This catalog pairs well with the Michigan Model 280 IIIA Parts Manual for service procedures. For other Clark-hurth models, see the Clark-hurth L320 1991 Parts Catalog – 690 Pages OEM Specs and the Clark-hurth 85III 1965 Parts Catalog – Factory OEM Specs. Each one follows the same factory indexing system, so you can build a complete library.

Avoiding Costly Mistakes with the Right Parts List

I’ve seen a mechanic order a transmission accumulator for a 280 IIIA that turned out to be from a different serial number range. The dozer wouldn’t shift. The original part had a different port orientation. That mistake cost him two days of downtime and a return fee. With the Clark-hurth 280 III A Parts Catalog, you verify the part number against the index – accumulator is T20 – and you order the exact supersession. The manual doesn’t show you how to install it (that’s the service manual’s job), but it guarantees you get the right piece before you start wrenching. Safety tip: always check the brake chamber part number against the air brake valve. A mismatch can cause brake fade on a slope.

Does this parts catalog include torque specifications?

No. This is a parts catalog – you need the service repair manual for torque values and assembly instructions.

How do I find the correct part number for the air brake valve on my Michigan 280 IIIA?

Open the alphabetical index under “Air Brake Valve” – it points to section B12. Inside that section, the illustration shows the valve assembly with callout numbers. Match your serial number range from page 1 to the parts list. If you have an early or late production variant, the index cross-references the right number. I always verify the slack adjuster (A3–A11) and air chamber (B3–B9) at the same time because those parts are often replaced together. The manual’s layout makes it easy to confirm all three in under five minutes.

Access the Factory Manual and put it next to your wrenches. Your dozer will thank you.