Michigan 380 III A Parts Catalog – Stop Ordering the Wrong Parts

You ever pull a transmission in a 380 III A, order a seal kit based on a cross-reference list, and find the o-ring is the wrong size? I have. That’s because some aftermarket “equivalent” catalogs are compiled by guys who never turned a wrench. This Michigan 380 III A Parts Catalog from Clark Equipment Company is the real deal – 225 pages of OEM part numbers, exploded views, and factory callouts. No third-party guessing, no mismatched hardware. If you maintain one of these articulated tractor dozers, you need this on the workbench.

Every section in this manual came straight from Clark’s engineering files. The warranty page alone tells you these guys stood behind their parts – that same level of accountability is baked into every part number listed. I’ve used Clark’s own documentation for years, and when you call a distributor with a factory part number from this catalog, you get the right piece the first time. That saves hours of downtime and wasted trips to the parts counter.

Michigan 380 III A Parts Catalog: 225 Pages of Factory Data

This isn’t a generic reprint or a scanned copy of something a dealer threw together. It’s the official Clark Parts Manual No. 3040, covering the Michigan 380 III A (G.M. 434A101 and up). The book is organized by major assemblies: engine, transmission, torque converter, steering, brakes, hydraulics, undercarriage, and electrical. Each section has exploded diagrams with indexed part numbers, so you can point at the piece you need and order it without interpretation. If you’ve ever tried to match a hydraulic seal by measuring a worn-out O-ring, you know the value of a part number that Clark engineered years ago.

What Part Numbers Does This Manual Cover?

Everything bolted to that dozer from the factory. Engine components (filters, gaskets, pistons), drivetrain (clutch packs, bearings, shafts), steering (cylinders, valves, linkages), brakes (shoes, camshafts, adjusters), hydraulic system (pumps, control valves, hoses), and undercarriage (track chains, rollers, sprockets). Even the small hardware – bolts, washers, pins – has a Clark part number in this catalog. You won’t find generic “replaces OEM” cross-references; you get the exact Clark piece.

Three Reasons to Trust OEM Clark Documentation

First, Clark wrote the bill of materials for this machine – they know what fits. Second, the part numbers in this manual match Clark’s current inventory system, so you can walk into any Clark dealer with a number and get the right part. Third, the exploded views show correct assembly order and orientation, which is critical when you’re rebuilding a multi-plate clutch or a steering differential. Aftermarket catalogs often rearrange or omit critical fasteners. Clark doesn’t.

Get the Right Steering and Brake Components

Steering and brake systems on the 380 III A are hydraulic over mechanical – if you get the wrong seal kit or brake shoe part number, you’re tearing it back down. This catalog gives you the factory brake shoe dimensions and the correct hydraulic cylinder repair kit numbers. Page references? I don’t need them when the diagram is right there with the part number stamped next to the callout. You can’t afford to guess on parts that affect machine control and safety.

Engine and Drivetrain: Where Most Mistakes Happen

Transmission overhaul kits are a common headache. This catalog lays out every seal, gasket, thrust washer, and clutch disc for the Clark transmission used in the 380 III A. You’ll find the correct torque converter stator part, the engine oil cooler line kit – even the flywheel ring gear. One misidentified gear set can lock up the transmission. The factory catalog eliminates that risk. Pair it with the service manual for the exact assembly instructions, and you’ve got a complete rebuild package.

If you need related documentation for other machines, check out Michigan Model 380 III A Tractor Dozer Parts Manual – Section: Transmission Leve and Michigan 380 III A 1966 Parts Catalog | OEM Factory Manual for additional coverage. For a different model, VOLVO BM 125C Wheel Loader Parts Catalog is also available. The construction equipment industry relies on precise part specifications, as noted in the Automotive Industry Overview and Automotive Industry Overview which detail how OEM documentation supports safety and reliability.

Frequently Asked Questions

Is this manual the same as the service manual?

No. This is a parts catalog, not a service manual. Service procedures are not included.

Can I order parts directly from this catalog?

A service manual covers repair steps, torque specs, and diagnostic procedures. This parts catalog focuses on part numbers, illustrations, and ordering info. If you need repair instructions, you need the service manual. But for any part replacement, this catalog is essential to get the correct OEM part. I’ve seen too many guys order a ‘compatible’ part from a generic catalog that doesn’t fit. Clark’s own catalog eliminates that. You take the part number from this book to any Clark dealer or online OEM parts supplier and you’ll get exactly what Clark originally installed. No cross-reference fumbling, no fitment doubts. That’s what makes this 225-page book worth more than its weight in shop towels.

Don’t waste shop time hunting down wrong parts. Get the factory data that Clark intended for their distributors. Download the Factory Manual and start ordering with confidence that comes from real OEM documentation.

Michigan 380 III A Parts Catalog

If you’re hunting for a part number on a Michigan 380 III A Parts Catalog and your only clue is a smudge on a casting, you know the frustration. I’ve been there – three hours on the phone with dealers who can’t read their own microfiche. This is the factory book. Clark Equipment printed it. 204 pages of exploded views, callouts, and the exact numbers you need to order without returns. No third-party interpretations. No “compatible with” garbage. You get the same document the parts counter uses.

Transmission and Converter Parts

Your 380 III A’s transmission case (page 48) is a hefty casting. If you’re rebuilding the clutch packs or replacing the converter, you need the right planetary carrier, seal kit, and gasket set. The manual lists the cartridge kit for transmission and converter on page 61, along with the converter charging pump and pressure regulating valve. Every part number is keyed to the exploded diagram. No guessing which spline count fits the input clutch – it’s drawn and labeled. I’ve seen guys order a fourth clutch when they needed a splitter clutch because some aftermarket catalog lumped them together. That doesn’t happen with this book.

Brake System: Detailed Breakdown

Brake assembly front and rear – page 85. Air brake valve, slack adjuster, cam shaft, shoe lining. If you’re replacing the air brake pedal or the foot valve, the manual pages for brake air lines (front on page 89, rear on pages 91–101) give you the routing and fitting part numbers. The air chamber on the front axle (page 73) is different from the rear (page 79). You have to know which diaphragm and pushrod length you need. This catalog ends the guesswork.

204 Pages of Factory Part Numbers

That’s 204 pages of verified OEM data. Every section – Engine Accessories (pages 1–7), Axle Assemblies (front drive 71–73, rear drive 79), Steering Cylinder Assembly (page 113), even the cockpit wiring harness (page 143) – it’s all here. You also get the blade assemblies for straight, coal, and “U” blades with cutting edges on pages 161–164. The electrical diagrams (page 156) are factory-original, not redrawn by someone who thinks a ground wire is optional.

Why OEM Beats Aftermarket for Parts Catalogs?

Aftermarket parts catalogs are reprints from sources that don’t own the dies. They often crop the part number off the edge of the page or use a generic illustration that fits ten different models. This manual is a direct scan of the original Clark Equipment document – same numbering, same callout lines, same notes about superseded parts. That matters when you need a Automotive Industry Overview of how this dozer’s hydraulic shift control valve (page 43) integrates with the main control valve (pages 133–141). You can’t fake that level of detail.

Parts Catalog: The Inventory You Need

If you’re running a shop that services these machines, you need this catalog on your bench. The engine accessories section alone covers the fan, by-pass filter piping, support parts. The Valve section includes air brake valve, converter pressure regulating valve, and downstream pressure regulating valve. Every component is linked to a page number. You don’t have to flip through random sections – the index at the front lists every item alphabetically. Found “Air Breather, Transmission” on page 47? That’s part of the transmission case group. The logic is consistent.

I’ve seen too many jobs stalled because someone ordered the wrong planet carrier for the rear differential (page 81) instead of the front (page 75). That’s a week of downtime and a restocking fee. Spend the money on the factory manual instead. For the price of a few wrong parts, you get certainty.

FAQ

Is this a service manual or a parts catalog?

Parts catalog. It lists every component with part numbers and exploded diagrams. For repair procedures you need the service manual. But without the right parts, a service manual is useless.

Does it cover the 380 III A with Cummins engine? My serial number is 418A101.

Yes. The cover page states this manual applies to 380 III A Cummins – serial numbers 418A101 and after. That includes your machine. The engine accessories section (pages 1–7) covers the Cummins setup, including by-pass filter piping and the engine hourmeter. If your machine is one of the earlier ones with a different engine, this won’t match. Check your serial number before buying.

Related manuals you might need: Michigan Model 380 III A Articulated Tractor Dozer Parts Manual and Michigan 380 III A 1966 Parts Catalog | OEM Factory Manual. Also check VOLVO BM 125C Wheel Loader Parts Catalog if you work on other equipment. For general industry context, see Automotive Industry Overview on Wikipedia.

Stop losing time chasing parts. Download the Factory Manual now.