Description

Ford PA-4020-F 1979 Parts Catalog – OEM Wheel & Weight Specs

You’ve been burned by a parts book that shows the wrong rim width or skips the dual-wheel axle hub. That’s the problem with those aftermarket compilations—somebody scanned a stack of microfiche and called it a day. This Ford PA-4020-F 1979 Parts Catalog came off the press at Ford Tractor Operations in May 1979—Supplement No. 3, 636 pages, original OEM print. Every part number, every illustration, every code finish and year note came from Dearborn, not a guy in a basement with a photocopier. If you are pulling a wheel or mounting weights on a 8000, 9000, 9700, or TW-series, this book is the source.

Wheel Assembly Breakdowns – Chapter 1 Content

The catalog devotes Chapter 1 entirely to wheels—66 pages of parts listings and exploded views. You get sections for front wheels (6-bolt on page 1-2, 8-bolt on page 1-3), rear standard wheels for 8000 with keyed axle (page 1-5), rear power-adjust wheels for 9000/8000 with tapered axle from 1970 (page 1-7), dual rear wheels on keyed axles (page 1-9), and manual/power-adjust rear wheels for 8700-9700 (page 1-11B). Each section carries the factory illustration location code (B3, B4, B5, etc.) so you can find the exact exploded view fast—no guessing which hub goes with which axle spline.

Front Wheels – 6-Bolt vs 8-Bolt Identification

Two different front-wheel assemblies live in this book. The 6-bolt version (1A1) lists part numbers like D8NN-1007-BA for 5.50 x 16 rims built from 1968-78, and D3NN-1007-A for 10 x 16 rims with a Norway/Germany code. The 8-bolt version (1A2) covers larger fronts used on heavier models. If you order by serial number range instead of counting bolts, you’ll get the wrong wheel. The catalog spells out the code finish (e.g., 3917141) and the remark column tells you which countries or assembly plants used each variant. This is the sort of detail that keeps a wheel from wobbling because you used the wrong offset.

Rear Wheel Options – Standard, Dual, Power-Adjust

Rear wheels get complicated fast. The 8000 with a keyed axle shaft uses a different hub retainer (D5NN-2190-AA on page 1-5) than the 8000 with a tapered axle from 1970 (page 1-7). Dual-wheel setups (1B3) for keyed axles list the extension hub (1B5, page 1-12) separately from the inner wheel. Power-adjust wheels (1B4) for 9000 and 8000 with tapered axles show up on page 1-11 with a different cone-and-roller assembly (S12565). The catalog respects trim level—8000 vs 9000, keyed vs tapered, manual vs power-adjust. You don’t air-bag a part number because the book separates them by axle type and year. For related manuals on similar Ford tractors, check Ford Wheel Loader 1975 Parts Catalog – OEM Factory Manual for loader-specific wheel parts, and Fordson Dexta Super Dexta 1957/64 Parts List if you work on the older generation.

Weight Kits and Front Axle Weights

Weight sections (1C1 through 1E1) break down rear wheel weights by diameter (30”, 32”, 34”, 38”) and adjustment type. Page 1-13 lists 30” weights for manual-adjust 8000 with a keyed axle; page 1-15 covers 32”-38” weights for 8000-9999 with tapered axles from 1970. Front axle weights (1D1, page 1-17) and front wheel weights (1E1, page 1-19) appear separately. The TW-10-20-30 front wheel drive axle section (1F1, page 1-21) gets its own weight listing. Every weight part number ties to a specific tractor family—using the wrong weight block can crack a hub, and this catalog keeps you from guessing.

OEM Authenticity – Why This 1979 Print Beats Aftermarket

Aftermarket catalogs often merge two different model years into one illustration and call it “universal.” Ford’s own 1979 print runs 636 pages with supplement updates, separate code finishes, and country-specific notes. The OEM part numbers in this catalog—like D8NN-1007-BA for front wheel assemblies or S12565 for cone & roller—are the same numbers Ford stamped on the original boxes. You trace a part from the illustration to the description, from the description to the code finish, and from the code finish to the exact year range. That traceability saves you from a 30-minute trip to the dealer for a return. See also Fordson Super Major 1960/64 & Major 1952/60 Parts List for even older Ford tractor parts.

FAQ

Does this catalog include both metric and SAE part numbers?

No. This is a 1979 US-market Ford catalog—all fasteners are SAE (e.g., 1/2-20 bolts, 5/8-18 nuts).

Will this work for a 1970 Ford 8000 with a tapered axle?

Yes. The catalog covers the PA-4020-F series which includes 8000 models with tapered axle shafts from 1970 onward. Section 1B2 (page 1-7) specifically addresses the 1970 changeover to the tapered (coin) axle. Compare your axle shaft to the illustration on that page—if the hub uses a keyway, you need the keyed axle section (1B1). The catalog also lists the code finish years (68/78, 79/, etc.) so you can cross-check your tractor serial number. This is the kind of detail that eliminates the “I think it fits” gamble.

Before you order a single wheel or weight block, you need the part number that matches your axle type, year, and production country. The internet forums will tell you to use a part number that “should be close.” Close gets you a rim that hits the tie rod. This book gives you the exact Ford part. Access the Factory Manual and put the right parts on your tractor the first time.

For a broader understanding of how OEM parts catalogs fit into the automotive repair ecosystem, you can read Automotive Industry Overview and the history of Automotive Battery standards—though those are tangents. The real value sits in these 636 pages of Ford factory data.