Fiat-Allis 12G-B 1979 Parts Catalog – OEM Factory Manual 337 Pages

I’ve been wrenching on heavy equipment long enough to know that ordering the wrong part costs you more than time – it costs you cash and credibility. The Fiat-Allis 12G-B 1979 Parts Catalog is the only documentation you should trust when you need to match bolts, bearings, and seals to your crawler loader. This is the factory book, not a copy. 337 pages of exploded views and part numbers keyed to specific serial number ranges (96Y02001 – UP and 55M02001 – UP). If you’ve ever had a parts counter guy shrug because you didn’t have the right number, you already know why you need this.

Parts Catalog Breakdown – What’s Inside the 1979 Fiat-Allis 12G-B Manual

Flip through the table of contents and you’ll see every major assembly listed – from Air Cleaner to Final Drive. Each section includes an exploded diagram with callouts that match the parts list. Need the part number for the Brake drum or the Brake Control linkage? It’s in there. Looking for Valve components in the bucket hydraulics? Same deal. The catalog covers the crawler loader and the steel mill special, plus the 11R Ripper attachment. You get 337 pages of factory data that hasn’t been filtered through a third-party publisher. No reprints, no doctored images – original OEM print.

Brake Assembly and Drum: Ordering the Right Parts

Brake systems on these machines take a beating. When you need a new brake drum or the actuating linkage, you can’t guess. The catalog gives you the exact part number for each component based on your machine’s serial number prefix. I’ve seen guys order a drum that looked right in the picture but had a different bolt pattern – that’s a week of downtime and a restocking fee. This manual eliminates that headache. Look up “Brake Drum” in the index, cross-reference the serial number, and write down the number. Done. No chasing microfiche at the dealer.

Cylinder Head and Camshaft – Finding Correct Part Numbers

The engine section covers Cylinder block, Cylinder head, Cylinder sleeve, and the Camshaft with its bearings. These are expensive components. Order the wrong camshaft and you’re pulling the engine apart twice. The catalog lists the part number for the camshaft itself, the bearings, and all the attaching hardware. Same for the Crankshaft and connecting rod – you get the factory numbers, not aftermarket cross-references that may or may not fit. If you’re rebuilding the bottom end, you want the OEM listing for the Crankshaft and main bearings. This is that book.

Why the OEM Catalog Beats Aftermarket Reprints

Every aftermarket parts catalog I’ve seen has mistakes – wrong part numbers, missing sub‑assemblies, or outdated illustrations. This one is the original Fiat-Allis publication from 1979, second printing. It supersedes the earlier edition and includes updates. The page numbering is consistent, the drawings are sharp, and each part number is tied to a specific serial number range. You won’t find a “universal” listing that doesn’t apply to your 12G-B. If you care about getting the job done without returns, you use the factory book. Period.

Valve and Injection System: Accuracy Saves Hours

Hydraulic valves, injection nozzles, the injection pump – these are precision parts. The catalog breaks down the Bucket Control Valve into individual components: spools, springs, seals. Same for the fuel injection system – you get the pump, nozzles, and lines with the correct part numbers for the Robert Bosch or Roosa Master pump depending on your machine. Page 73 lists the injection pump service manual form numbers, but for parts ordering, this catalog is your one reference. I’ve wasted a day trying to match a valve spool from a generic cross‑reference. Not anymore.

Related Manuals You Might Need

• Fiat-Allis HD41 Parts Catalog – 370-Page OEM Factory Manual
• Fiat-Allis 6G Crawler Loader Publications Index
• FIAT-ALLIS 12G Crawler Loader Parts Catalog

For a broader understanding of how these machines fit into the industry, check out the Automotive Industry Overview and Automotive Industry Overview.

Does this manual include repair procedures or torque specs?

No. This is a parts catalog, not a service manual. It lists part numbers and exploded diagrams for ordering, not step‑by‑step repair steps.

How do I verify that a part number from this catalog is current for my machine?

Fiat-Allis updated parts as the machines evolved. The catalog was printed in 1979 (second printing) and includes revisions to that date. For later changes, you should verify part numbers through your dealer’s current microfiche or online system. The serial number ranges (96Y02001-UP and 55M02001-UP) tell you which machine variants this catalog covers. If your machine falls outside those ranges, cross‑reference with a newer publication. Always give your full machine serial number when ordering – that’s the only way to catch superseded parts. I’ve seen a part number change because of a minor casting revision, and if you don’t check, you get the wrong seal or bolt. This catalog gives you the foundation, but the dealer’s system confirms the latest number.

If you work on Fiat-Allis 12G-B crawler loaders, you need this catalog on your bench or in your tablet. It keeps you from guessing, and it keeps your parts orders correct. Download the Factory Manual from AutoRepairManuals and get the original data that saves you returns, delays, and frustration.