Description

Michigan 55I Parts Catalog – Factory OEM Parts Breakdown

Let me tell you something about ordering parts for a Michigan 55I Tractor Shovel. I’ve spent 28 years in this trade, and nothing wastes more billable hours than a wrong part number. Aftermarket catalogs copy from each other, transpose digits, and leave you holding a brake line that doesn’t match the bend. This Michigan 55I Parts Catalog – factory OEM, 88 pages – is what Clark Equipment originally printed. It’s the same book the dealer used when your machine was new. If you want the right part the first time, you work from this.

What You Get in This 88-Page Parts Catalog

The index alone saves you an hour of flipping. It breaks the machine into groups: Axle (front drive, rear steer, differentials, planet spider), Brake (front assembly, four-wheel lines, floorboards, parking brake), Converter, Cylinder (boom, bucket, steering), Pump (bucket/boom, converter/steering), Transmission, Valve, Steering, Wiring, and Hydraulic systems. Each group has its own exploded-view drawing with part numbers and quantities. Page 1 shows the full index – you can pin it to your toolbox.

If you need a replacement boom cylinder seal kit, the Cylinder Group section (page reference C5) gives you the factory part number, not some cross-referenced guess. The same goes for the Converter Pressure Regulator Valve on page C4. This catalog is the only source you should trust for the 55I.

Brake Group: Why OEM Part Numbers Matter

The Brake Group covers four separate assemblies: front brake (page B8), brake lines for the four-wheel system (B9), brake controls and floorboards (B10), parking brake assembly (B11), and parking brake controls (B12). Each part number is tied to the original Clark Engineering drawing. I’ve seen aftermarket “replacements” that use a different thread pitch on the banjo bolt – that’s a leak waiting to happen. With this catalog, you order the exact bolt, line, and seal Clark spec’d. Safety isn’t the place to cut corners.

Wiring Group: Tracing Circuits Without the Guesswork

The Wiring Group (pages G1–G3) includes the battery and battery box, battery and wiring cables, horn and mounting parts, decals, tools, lights, and mounting parts. If your 55I has an electrical gremlin – dead lights, horn not working – the factory wiring diagram here shows the exact routing and connector part numbers. Aftermarket wiring diagrams often condense multiple harnesses into one generic drawing. This catalog gives you the real layout, including the decal set number so you can replace faded warning labels. You can also find the correct battery cable lengths, which saves you from buying a universal cable that’s six inches too short.

How This Manual Saves You Time and Money

Every time you order a part using this catalog, you eliminate the back-and-forth of returns. The part numbers are specific to the 55I, not a range of models. For example, the Bucket and Boom Pump (page E1) has a unique part number. Ordering a “universal” pump might bolt up but deliver the wrong flow. The catalog also includes the Converter Steering Pump (page E2) and Pressure Relief Valve for Steering (page F13). When you need a steering cylinder seal, the cylinder assembly drawing on page C8 lists every O-ring, wiper, and bushing. That’s the difference between a one-hour repair and a three-day wait for the right kit.

I keep a copy of related manuals on the shelf next to this one: VOLVO BM 125C Wheel Loader Parts Catalog and Michigan 851 Parts Catalog – 72-Page Factory Parts Manual. Also check the Michigan 85III 1965 Parts Catalog – Factory OEM Parts Breakdown for similar-era machines.

Who Needs This Manual?

If you own a Michigan 55I, you need this. Independent mechanics who work on older loaders will find it indispensable for quoting jobs. Fleet managers can use it to stock common wear items – brake segments, wheel and tire data (page F14), hydraulic oil reservoir (page D6). Even if you have a digital subscription to an aftermarket parts site, they often strip out illustrations or mislabel fasteners. This factory catalog doesn’t have that problem. It’s a single source of truth for 1950s–60s Clark equipment.

A short note: when you open the catalog, note the machine serial number on the cover. The parts listings in this edition cover multiple serial number ranges. For the Accelerator Pedal and Linkage (page A5), it specifically calls out serial 3826 thru 3855 and thereafter. If you don’t match serial numbers, you might order a choke rod that doesn’t fit.

Why Aftermarket Parts Manuals Don’t Cut It

Aftermarket reprints are often scanned at low resolution, missing page numbers, and sometimes they omit entire sections like the Wiring Group or Brake Controls. I’ve seen a “reprint” that swapped the brake line drawing with the converter line drawing – parts look similar but dimensions are off. This PDF is a direct scan of the original printed manual No. 5005. It’s complete, including the index, all exploded views, and the part number lists with quantities. For the Automotive Industry Overview, this level of documentation is what keeps older equipment running without custom fabrication. The same principle applies to construction equipment – you need factory data.

I mention this because I’ve watched techs waste a day chasing a leak that came from a misidentified O-ring in a non-OEM catalog. The Automotive Industry Overview doesn’t tell you that, but 28 years in the shop does.

Does this parts catalog include wiring diagrams?

Yes. The Wiring Group section (pages G1-G3) covers battery, cables, horn, lights, and decals, with part numbers and mounting illustrations.

Can I use this to identify brake part numbers?

Absolutely. The Brake Group has five subsections: front brake assembly, four-wheel brake lines, controls and floorboards, parking brake assembly, and parking brake controls. Each part is listed with the factory number and quantity required. If you need a specific brake line, you’ll see the exact routing and fitting type. This is the only way to ensure you get the right part without pulling the line first and trying to match it at a counter.

You’ve got a machine that earns its keep. Don’t trust replacement parts to a random website. Access the Factory Manual and start ordering the right parts for your Michigan 55I today.