Description

Michigan 125 III Parts Catalog

Every time a 125 III comes into my bay with a mismatched steering cylinder because somebody ordered from a third-party parts list, I want to staple the invoice to their forehead. That’s why this Michigan 125 III Parts Catalog sits open on my reference bench. It’s the exact same 188-page book Toyo Umpanki printed under license from Clark Equipment in 1970, covering the GM-engine 4026 series. You need a part number for a steering pump seal? Page 4. Hydraulic reservoir tank? Same page. This isn’t a service manual — it’s a parts bible. If you’re rebuilding a rear-wheel steer tractor shovel and don’t want to gamble with aftermarket ravings, this is your starting point.

Hydraulic System Steering: Nissan and GM Engine Coverage

Page 4 spells out the steering system in full: pump, cylinder, handle, and reservoir tank. The manual covers both Nissan and GM engine variants. The original binder even included a change notice (July 1970) updating the illustration details. You get the factory exploded views with part callouts — not some photocopied mess. I’ve seen guys order a steering cylinder for a Nissan engine machine when they had a GM, then wonder why the threads didn’t line up. This catalog keeps that from happening.

Does This Manual Cover Repairs or Just Parts?

Parts only. Don’t expect torque sequences, adjustment procedures, or overhaul instructions. If you need service procedures, you want the corresponding service manual. What you get here are OEM part numbers, group numbers, and illustration references that let you order exactly what the factory put on. For a machine like the Automotive Industry Overview Michigan 125 III, aftermarket parts houses often substitute generic components that don’t fit right. This catalog eliminates that risk.

188 Pages of Factory Part Numbers

Pages 1 through 188 — every page is a scan of the original printed book. No reprints, no OCR errors, no missing sections. The PDF bookmark list shows every single page individually (pages 1 through 188), so navigation is quick. I’ve used this to cross-reference hydraulic seals for a 1970 machine and found the correct part number in under a minute. Try doing that with a generic aftermarket cross-reference chart.

Get the Right Part Before You Start

Before you pull a steering handle off a 125 III tractor shovel, open this catalog. The exploded view shows you the exact order of bushings, seals, and retainers. The part numbers listed are the ones that were valid when the machine left Osaka. Compare them to what you have on your bench. If the numbers don’t match, you’re looking at the wrong part. I’ve seen two different reservoir tanks used across the Nissan and GM series — the catalog shows both.

Source Validity: OEM Factory Print vs Aftermarket Compilations

This is a direct scan of the Toyo Umpanki / TCM factory manual, printed under license from Clark Equipment (Michigan trademark). The MICHIGAN 125 III Tractor Shovel Parts Manual is not a reprint or a third-party compilation. Every part number comes from the same engineering drawings used on the line. If you’ve ever tried using a parts manual from a generic publisher, you know they often drop hardware items like washers or oil seals. The factory manual doesn’t. It lists every nut and O-ring. On an automotive scale, this is the difference between the Automotive Industry Overview and a parts-store cross-reference that groups unrelated parts under one number.

Related manuals you may need alongside this one: Volvo BM Michigan 125C 1988 Parts Catalog – Factory OEM Parts Manual and Michigan 851 Parts Catalog – 72-Page Factory Parts Manual. The 125C shares many steering components, but the 125 III parts catalog is the definitive source for the earlier GM-engine machines.

Frequently Asked Questions

Is this the same as a service manual?

No. This is a parts catalog only — exploded views and part numbers. You need a separate service manual for repair procedures.

Can I use this to find torque specs?

No torque values are listed. This is a parts identification document. For torque specs, you need the factory service manual.

What serial numbers does this cover?

GM engine 4026 series only. The cover states “Information contained herein pertains to Machine Serial Numbers listed below: GM ENGINE – 4026 SERIES.” Machines with Nissan engines are not included in this version.

Why is the steering system section important for ordering?

Because the steering pump, cylinder, and reservoir differ between the Nissan and GM engine variants. Page 4 gives the exact OEM part numbers. Ordering a Nissan steering cylinder for a GM machine results in thread mismatch and leaks. The factory catalog shows both systems clearly — no guessing.

If you are maintaining or restoring a Michigan 125 III Rear Wheel Steer Tractor Shovel, this Michigan 125 III Parts Catalog is the only reliable way to identify and order the correct factory parts. Skip the aftermarket guesswork. Access the Factory Manual and get your part numbers straight before you open the toolbox.