Description

Clark-hurth 125 IIIA 1970 Parts Catalog – Original Factory Issue

If you’re trying to source parts for a Michigan 125 IIIA loader and you get handed aftermarket drawings with wrong callouts, you know the headache. Wasted time, wrong seals, bolts that don’t fit. This Clark-hurth 125 IIIA 1970 Parts Catalog is the factory issue – 330 pages of exploded diagrams, part numbers, and ordering codes straight from Clark Equipment. No guessing which bearing race goes where.

I’ve been turning wrenches long enough to know that when you’re rebuilding a pump or resealing a ram, the Parts Catalog is the only thing that saves you from ordering three different parts and returning two. This one came off a press from Clark’s European area, printed in 1970. It covers both the Leyland and G.M. 6V-71N powered 125 IIIA machines, with serial number ranges listed right on page 3.

What This Parts Catalog Covers

Every main group on the loader gets its own section – engine, transmission, hydraulic pumps, final drives, steering, brakes. The book’s group number index splits it into sections like Group 18 (Hydraulic Pumps). Within that, sub-groups break down the pump into every nut and seal. Need the main hydraulic pump breakdown? Page 18E-001 shows the exploded view with callouts. The part number, description, and quantity per machine are right next to each illustration. You don’t flip back and forth between text and figure – it’s all on the same spread.

How to Use the Exploded Diagrams

Open to any page and you’ll see a drawing of the assembly. Part numbers are keyed to a table below. The page numbering system tells you the group and the country of origin – for example, 18E-001 means Group 18, European market, first page. Page 5 of the manual gives a step-by-step example using the hydraulic pump. You check the pictorial index, find your group, flip to the relevant page, and read off the part number. That’s it. No guesswork, no cross-referencing a separate diagram.

One tip: always confirm your machine serial number against the list on page 3 before ordering. The 125 IIIA was built with two different engines and the parts changed accordingly. The manual warns you on page 3: the Leyland-powered machine (serial 4137) uses different engine-related parts than the G.M. 6V-71N (serial 4138).

OEM vs Aftermarket Parts Documentation

Aftermarket catalogs copy the drawings but often leave out the revision notes and the “effective serial number” columns. This factory print has those. Clark Equipment Company licensed this manual through Clark Equipment Limited in the UK. The symbols used throughout – special marks for non-standard items – are explained in the “Special Symbols” section. You won’t find those in a third-party reprint. If you’re paying for accuracy, pay for the original.

Audience Fit: Who Needs This Catalog

You’re a shop owner in San Antonio with a 1970s Michigan 125 IIIA that’s been sitting because the previous mechanic ordered the wrong steering cylinder seal kit. Or you’re a collector restoring a 125 IIIA for a construction museum. Or a field technician who needs to pull a final drive apart and wants to have every bearing on hand before you start. This catalog is for anyone who wants to order parts once and have them fit. It’s not a repair manual – there are no torque specs or troubleshooting steps – but it gives you the exact part numbers and quantities you need to place an order that won’t get returned.

If you’re also working on other Clark-hurth gear, check out the Clark-hurth L320 1991 Parts Catalog – 690 Pages OEM Specs for larger trucks, or the Clark-hurth 85III 1965 Parts Catalog – Factory OEM Specs for an earlier model. For the 85A series, the Clark-hurth 85A, 85A1 1978 Parts Catalog – OEM Factory Specs covers those variations. Each of those is a genuine factory catalog, not a scan of a scan.

Source Validity: Original Factory Print

The manual you’re looking at is a direct scan of the 1970 Clark Equipment publication TP3131. The cover lists it as “MICHIGAN” parts manual – Michigan was Clark’s construction equipment brand at the time. The book states it’s “Manufactured under licence by Clark Equipment Limited, Camberley, Surrey, England.” That’s the real deal. It’s not a compilation or a reprint from a second-hand source. For context on why factory documentation matters for older equipment, read the Automotive Industry Overview on standardized parts documentation. If you need to understand the engine itself, the Internal Combustion Engine article gives a solid foundation, but the part numbers? Only this catalog has the right ones for your Clark-hurth 125 IIIA.

Frequently Asked Questions

Does this manual cover all 125 IIIA serial numbers?

No. It only covers machines with serial numbers listed on page 3 – specifically 4137 (Leyland engine) and 4138 (G.M. 6V-71N). If your machine is outside that range, you need a different manual.

How are part numbers organized in this catalog?

Part numbers appear in tables under exploded diagrams. Each page belongs to a group (e.g., 18 for Hydraulic Pumps) and a sub-group. The group number is the first two digits of the page number. The part number column gives the factory code, followed by description and quantity. You order using the part number, not the illustration callout number. Always confirm the part description matches your existing part before ordering.

Stop chasing parts through sketchy online listings. This Clark-hurth 125 IIIA 1970 Parts Catalog puts the factory parts data on your screen. Access the Factory Manual here and start ordering the right parts today.