Description

Michigan 125A Parts Catalog

Michigan 125A Parts Catalog – the factory book, not some aftermarket reprint. I’ve been turning wrenches for 28 years, and I’ve seen guys order the wrong part from a third-party catalog, then spend a week waiting for the correct one while the machine sits. This is the original Parts Manual No. 402, published by Michigan (Great Britain) Limited. 80 pages of exploded views, part numbers, and interchange codes. No fluff.

Engine and Accessories Coverage

Pages 1 and 2 cover the engine assembly, accessories, support parts, and controls. If you need the part number for a water pump or gasket set, this is where you start. The Engine section also lists the exhaust system on page 4 and the fuel system on pages 14-15. You get the factory breakdown of every bolt and bracket.

Brake System Breakdown

The brake system spreads across multiple pages – wheel brake assembly (page 51), brake foot valve (page 44), brake lines (pages 46-50), parking brake (page 54), and the power cluster (page 45). Each drawing shows the exact part, seal, and spring. If you’re rebuilding the Brake cylinders on a 125A, you need this catalog to get the right bore size and mounting.

Cylinder Assembly: Boom, Bucket, Steering

Three separate cylinder entries in the index: Boom Cylinder (page 70), Bucket Cylinder (page 71), and Steering Cylinder (page 72). Each one lists the piston, rod, seals, and bushings. The Cylinder breakdowns are identical to what the factory used on the assembly line. I’ve had to order new bucket leveller master cylinders (page 74) – without factory part numbers, you risk ordering a unit that doesn’t match the port orientation.

Valve Components and Control Linkage

Control valve, steering pressure valve, torque converter pressure regulator valve – they’re all in here. Pages 63-65 show the control levers and linkage for the Valve assembly, and page 68 covers the steering pump pressure regulator. If you’re chasing a hydraulic drift or low pressure, having the exact part number for the spool or relief spring saves days of cross-referencing.

Michigan 125A Parts Catalog: 80 Pages of Factory Specs

Eighty pages, spiral-bound layout in the original PDF. Every page is a scanned factory document – not a re-drawn aftermarket version. The index runs from Accelerator Pedal (page 12-13) all the way to Wheels and Tyres (page 77). You get the complete Automotive Industry Overview of how this tractor shovel was built. Automotive Industry Overview

Why Use the Factory Parts Catalog?

Because the aftermarket catalogs I’ve seen have incorrect supersessions. The Michigan 125A has both American and British parts – the manual clearly notes that parts prefixed ‘M’ are interchangeable with American versions, while ‘AW’ parts are British design and NOT interchangeable. The serial number of your machine is critical when ordering. Without this catalog, you’re guessing. With it, you have page 44 for the brake foot valve, page 70 for the boom cylinder, and every other component listed by original factory number.

Frequently Asked Questions

Does this catalog include torque specifications?

No. This is a parts catalog, not a service manual. It provides part numbers and exploded views, not torque values or repair procedures.

How do I find the correct part number for my machine?

You’ll need the serial number of your Michigan 125A Series II Tractor Shovel. The manual instructs you to always give the serial number when ordering. Then locate the section – for example, the engine is on pages 1-2 – and pick the part from the diagram. Cross-check the prefix (‘M’ vs ‘AW’) to confirm interchangeability.

Are the part numbers interchangeable between Series II and earlier models?

This catalog covers only the 125A Series II. Earlier Series I machines may use different part numbers. The manual explicitly states that parts with ‘AW’ prefix are unique to British design and will not interchange with American parts of the same application.

What if I need wiring diagrams or repair procedures?

Then you need a separate service manual. This parts catalog is strictly for ordering replacement components. For repair steps, you’d want the factory repair manual – such as the MICHIGAN 125A TRACTOR SHOVEL PARTS MANUAL or the companion service book. But don’t skip this catalog: if you order a part using a guess, you’ll waste time and money. Combine this with a proper repair manual and you’ll have everything you need to keep your 125A running. The Michigan Model 125A Tractor Shovel Parts Manual No. 1670 is another edition that covers the same machine, and the MICHIGAN Model 125A Tractor Shovel Parts Manual No. 401 is a related variant. All are factory documents, all worth having on your shelf.

You need this catalog if you plan to keep your 125A on the job. Stop wasting time on mismatched parts. Access the Factory Manual now and get the correct part numbers the first time.