Michigan 380 III A 1966 Parts Catalog

If you’ve ever ordered a part for a Michigan 380 III A 1966 Parts Catalog and ended up with a mismatched piece, you know the cost of guessing. This is the factory document that Clark Equipment issued in 1966 to ensure you get the exact part number every time. 179 pages of exploded views, part numbers, and group indexes. Not a reprint. Not a third-party compilation. Original OEM scan.

The warranty and ordering rules are on page 3. Read them. They tell you why you need to give the serial number.

Parts Groups: A Through Y and Z

Standard equipment parts are grouped in sections A through Y. Optional and accessory items are all under Group Z. This layout matches the way the machine was built—no need to hunt through separate supplements. The group letter is the first character of the page number. For example, transmission components fall under T. Look for ‘Transmission Case T5’, ‘Control Cover Assembly Transmission T7’, ‘Transmission Shift T19’. You get the idea.

How to Order Parts Correctly

The manual states clearly: Always give serial number of machine. Then supply quantity, part number, and description. Order through your nearest Clark Distributor for THE MICHIGAN LINE. The first page of the manual (page 3) includes the warranty terms and the ordering instructions. Ignore this and you’ll get the wrong parts. Clark updated machines frequently—the manual applies to 380 III A G.M. 434A101 and after, as noted on page 3. Check your serial number before ordering.

3 Critical Sections in This Catalog

First, the Alphabetical Index (page 4 onward) lets you locate any component by name. Second, the individual group pages (A through Y) contain exploded view diagrams with numbered callouts. Third, Group Z covers all optional and accessory items, from blade assemblies to back-up alarms. These three sections cover every part that was available for the 380 III A as of 1966.

Get the Right Part Numbers Using the Index

The index is not a joke. It lists every part name from ‘Accumulator Z2’ to ‘Converter Pressure Regulating Valve V11’. Find the part you need, note the group and page number, then turn to that page. For example, ‘Brake Air Chamber A3–>A7’ means you’ll find brake air chamber parts in group A, pages A3 through A7. Each page has a revision number, so if your machine is later, check the revision history in the front.

Transmission Components: What’s Covered

Pages T5 through T21 cover the transmission case, clutches (first, second, third, fourth, reverse, input, splitter), control cover assembly, and shift controls. The converter assembly is in C9 and C11. The transmission oil filter and converter oil filter are listed under E10 and H11. If you need a clutch first, look for ‘Clutch First T8’ in the index. The exploded view will show the part number for each clutch plate and spring.

Why OEM Documentation Matters

Aftermarket parts catalogs often copy the drawings but miss the part numbers or get them wrong. This is the original 1966 Clark Equipment parts manual. It was distributed to dealers to keep their parts departments accurate. The illustrations and part numbers align with the actual production machines. Using this manual means you are working from the same reference that Clark’s own parts counter used. Automotive Industry Overview provides context on how manufacturers like Clark evolved. But for parts, stick with OEM.

Who Should Own This Parts Catalog

If you own a Michigan 380 III A articulated tractor dozer, you need this catalog. If you are restoring one, you need it. Equipment owners, mechanics, and dealers who work on these machines. The 179 pages cover everything from the blade assembly to the cab lamps. Michigan Model 380 III A Tractor Dozer Parts Manual – Section: Transmission Leve is a related manual that focuses on the transmission section. Michigan Model 380 III A Articulated Tractor Dozer Parts Manual covers the entire machine. VOLVO BM 125C Wheel Loader Parts Catalog is for a different machine but uses similar Clark design principles.

Frequently Asked Questions

Does this catalog include torque specifications?

No. This is a parts catalog, not a service manual. For torque values, get the service manual.

How do I find the part number for a transmission clutch?

Use the alphabetical index starting on page 4 to locate the clutch entry, such as ‘Clutch First T8’. Then turn to group T pages T8. The exploded diagram will show the part numbers for each clutch component, including plates, springs, and seals. The page number format includes a version number after the hyphen, so ensure you are looking at the correct revision. If your machine serial number falls within the range noted in the front matter (page 3), that revision applies. Cross-reference the part number with the parts list on the same page or adjacent page. For further assistance, contact your Clark distributor with the serial number.

Stop ordering parts blind. Download the Factory Manual from AutoRepairManuals and get the right part numbers the first time. For a broader look at the automotive industry during this era, check Automotive Industry Overview.