Description

Clark Equipment 125A-B, 125A II Parts Catalog – OEM Factory Manual

If you’re keeping a 125A-B or 125A II running in a shop or on a job site, guessing at part numbers costs you time and money. I’ve seen too many guys order a hydraulic cylinder seal kit off a list someone posted online, only to get the wrong bore size. This is the factory Clark Equipment 125A-B, 125A II Parts Catalog – 197 pages of what Clark put on the machine when it left the line. Not a reprint, not a third-party compilation. Original OEM scans.

Clark Equipment 125A-B, 125A II Parts Catalog: 197 Pages of Factory Data

You get exploded views for every major assembly – engine, drive train, hydraulics, steering, brakes, you name it. Each part callout ties to a genuine Clark part number. The 197 pages cover both the 125A-B and the 125A II, so if your lot number falls under either model, you’re covered. Page 1 shows the model designation and manual number 403. That’s the same manual Clark’s own parts counter used.

Why Does the Serial Number Plate Matter?

Page 2 of this manual walks you through reading the serial number plate. Clark built these machines in lots – two machines with the same model number could have different parts due to production changes. The manual tells you to quote the model, lot, specification number, and tractor serial number with every order. Skip that, and you risk getting parts that don’t fit. The serial number is also stamped on the front crossmember under the hood. Verify it before you order anything.

3 Critical Rules for Ordering Parts

First, always use the build card. This manual explains on page 3 how Clark’s Spare Parts Division keeps a build card for each machine. Second, check the specification letter. The radiator section, for example, uses code R 36 – you need the spec letter to find the right sub-list. Third, understand part number interchangeability. Clark six‑figure part numbers (e.g. 123456) are identical between US and UK sources. Seven‑figure numbers starting with ‘3’ are British manufacture and may not swap. That’s on page 3 of the catalog.

Using the Index – Save Hours of Hunting

This catalog has an index. If you can’t find a part by assembly, look up the part name in the index first. The manual gives an example: the brake wheel cylinder is listed under axle sections FDA and RDA. That kind of cross-referencing cuts down the time you spend flipping pages. I’ve used these factory indexes to find everything from a steering kingpin seal to a shift lever knob. It works if you actually use it.

Interchangeability: American vs British Part Numbers

A lot of these machines were built in the UK under license. The parts catalog notes that all seven‑figure numbers starting with ‘3’ are British. That doesn’t mean they’re wrong – it means you have to verify the application against your machine’s build card. The six‑figure numbers are direct crossovers to US Clark parts. If you’re sourcing parts from a US supplier, stick to six‑figure numbers. The manual prints those numbers clearly. I’ve seen guys order a British part number and get a casting with different bolt hole spacing. Don’t be that guy.

Related manuals you might need:

• Clark Equipment 75B 1989 Parts Catalog – OEM Factory Manual
• Clark Equipment 310, 310III Parts Catalog – OEM Factory Manual
• Clark Equipment 12E2E 1968 Parts Catalog – OEM Factory Manual

For background on how these machines fit into the broader market, see Automotive Industry Overview. Automotive Industry Overview has details on construction equipment manufacturing too.

Frequently Asked Questions

Can I use this catalog for both the 125A-B and the 125A II?

Yes – the manual covers both models in one binder.

Does this include torque specifications or repair procedures?

No. This is a parts catalog – it shows exploded views and part numbers. For repair procedures, you need the separate service manual. The parts catalog is for ordering the right components when you already know what you’re fixing. I’ve had guys try to use a parts diagram to figure out reassembly order. That’s not what it’s for. Get the service manual if you need step‑by‑step instructions, torque values, and clearance specs. This one gives you the part numbers you need to write a purchase order.

How do I know which part number applies if my machine has been modified?

Clark reserved the right to make changes without notice – it says so inside the front cover. The only way to know if a part supercedes is to check the build card for your specific serial number. The manual explains how to use the build card on page 3. If you don’t have access to Clark’s records, you can try comparing your old part with the illustration in the catalog. That’s the best you can do without factory support.

Is this an original OEM publication or a reprint?

This is a factory scan of the original Clark Parts Manual No. 403. Not a reprint. Not a third-party compilation.

You need the right parts to keep a 125A‑B or 125A‑II productive. Stop guessing and start using the same reference Clark dealers used. Access the Factory Manual now.