Michigan 55A Parts Catalog – Factory Numerical Index for Tractor Shovel

I’ve seen too many guys order the wrong part because they trusted a third‑party parts list. Then they stand in the shop with a seal that doesn’t fit and a machine down. This Michigan 55A Parts Catalog is the factory print – 110 pages of part numbers tied to page numbers, straight from Michigan (Great Britain). If you work on a 55A Tractor Shovel, you need this on your bench before you touch a wrench.

Numerical Index Organization – Find Parts by Number

The heart of this manual is the Numerical Index starting on page 3. It lists every part number for the Model 55A and tells you exactly which page to flip to. For example, part AW2/4 is on page 76, AW4/6 covers pages 1, 2, 3, 5, 6, 9, 11, 13, 14, 15, 21, 33, 35, 37, 49, 50, 57, 58, 61, 63, 68, 71, 74, 76, 77, 78, 79. That kind of cross‑referencing means you can find the bucket pins, hydraulic seals, or steering components without flipping through every page blind. I’ve used enough aftermarket catalogs that list part numbers with no page reference – this one kills that frustration.

Model 55A All Wheel Drive System – What’s Covered

Look at the index: part numbers starting with AW6 (e.g., AW6/65, AW6/66, AW6/67) appear on pages covering the drive train and all‑wheel‑drive components. The manual’s title page calls it the “MICHIGAil ALL WHEEL DRIVE” system. If you’re rebuilding a transfer case or replacing axle seals, the part numbers you need are in this catalog. The index alone saved me an hour last week locating a thrust washer for the front differential.

Why Factory Documentation Matters – Aftermarket vs OEM

Aftermarket parts catalogs often reprint factory data with errors – a wrong digit in a part number and you’ve got the wrong bearing. This Parts Catalog is a scan of the original Michigan (Great Britain) publication, number 501. It’s not a third‑party re‑keyed version. The page numbers match the factory service manual. If you already own a service manual for the 55A, this catalog lets you order the exact OEM parts by number. No guesswork.

7 Component Groups Covered

While the index is numerical, the underlying organization covers the major assemblies of the 55A: steering (AW2/…), hydraulics (AW4/…), power train (AW6/…), brakes (AW8/…), and more. Over 200 distinct part numbers are indexed across the 110 pages. For related documentation, see Michigan 55A Tractor Shovel Parts Manual 1394 and Michigan 55A Tractor Shovel Parts Manual for the service manual. If you need a newer variant, check Michigan 55A Series II Tractor Shovel Parts Manual.

Using the Index – Real Example

You need a steering cylinder seal kit. Pull up the index – part AW2/5 is listed on pages 9, 71, 76, 77. Flip to page 71, you’ll see the part number in context with the assembly drawing. Order that exact number. No cross‑shopping between brands. That’s the value of an OEM Parts Catalog. For a broader look at heavy‑equipment documentation standards, reference the Automotive Industry Overview for context on part numbering systems.

Does this manual include exploded diagrams?

No. This is a parts catalog – it lists part numbers and page references to find diagrams in the associated service manual. You get the numerical index, not drawings.

Can I use this catalog to identify parts by description?

The index is by part number only. If you know the part number, you locate the page. If you only have a vague description (e.g., “hydraulic tube assembly”), you’ll need the service manual’s illustration index first. However, the service manual often references these same part numbers, so once you have the number, this catalog pins down the page.

Will this work for a 55A Series II machine?

This catalog is specifically for the original Model 55A. The Series II has different part numbers. For the Series II, get Michigan 55A Series II Tractor Shovel Parts Manual.

How do I know the part numbers are accurate after 50 years?

This is a factory scan. Michigan (Great Britain) printed it. If a part number has superseded, you’ll need the latest OEM bulletin – but the catalog gives you the original as‑built numbers. Most old‑equipment dealers still use these to cross‑reference to current part numbers.

Bottom line: if you maintain a Michigan 55A Tractor Shovel, stop wasting time with aftermarket lists that send you the wrong part. Download the Factory Manual now.