Description

Fiat-Allis 645 M Parts Catalog – 236-Page OEM Factory Manual

I’ve been wrenching on heavy equipment long enough to know that guessing a part number costs you a week of downtime and a freight charge. That’s why when I see a Fiat-Allis 645 M Parts Catalog on the bench, I know somebody’s doing it right. This isn’t a reprint slapped together from scanned napkins – it’s the original factory document, 236 pages of exploded views, callouts, and every nut, bolt, and seal listed by OEM part number. If you’re tearing down a 645 M wheel loader and need to order brake lines or a valve assembly, you open this book.

Brake Assembly Pages 110 and 112: What You Get

Brakes on a loader aren’t optional. The catalog breaks out the front axle brake assembly on page 110 and the rear axle on page 112. Each page shows the exploded diagram with every component – shoes, springs, seals, pistons – matched to its factory part number. I’ve seen guys order a “brake kit” off an aftermarket site and end up with the wrong return spring tension. That doesn’t happen when you order off the OEM callout.

Does This Catalog Cover the Valve Systems?

You bet. The table of contents lists Air Application Valve Assy (page 138), Control Valve Assembly (page 173), Clutch Cut-Off Valve (page 118), and Demand Valve Assembly (page 154). Each one has its own exploded view with hardware callouts. If you’re swapping a spool or need the o-ring size for a hydraulic control valve, the part number is right there.

236 Pages of Factory Part Numbers

Two hundred and thirty-six pages, and every one of them is a direct scan from the original Fiat-Allis print. Engine section starts at page 11 with the cylinder block and head. The fuel system: injection pump (page 38), nozzles and lines (page 40). The hydraulic system: pump (page 160), piping (page 156), cylinders for bucket, dump, lift, and power steering. You want the seal kit for a dump cylinder? Turn to page 166. Need the mounting bolt torque for the front axle housing? Page 95 gives you the hardware callout – you cross‑reference the bolt number to find the grade and thread pitch.

Get the Right Part the First Time

Ordering parts blind costs time and money. With this catalog, you get the OEM part number before you call the dealer. No more “I think it’s the same as the 645B.” The manual is serial-number specific (S/N 8001–9176), so you know the brake assembly, the alcohol evaporator, the air compressor – everything matches your machine. I keep a copy in the shop and one in the truck. When a track loader comes in with an air brake line leak, I flip to page 132, find the line section, and have the part number ready before the customer finishes his coffee.

Air Cleaner and Fuel Filter: Not Guesswork

Filters are another place aftermarket catalogs get sloppy. The original manual lists the air cleaner elements on page 46 and the fuel filter on page 33 – not just a generic cross‑reference but the actual Fiat-Allis part number. Same for the transmission oil filter (page 83) and engine oil filter (page 30). When you buy a filter by the factory number, you get the correct micron rating and seal design. That matters when you’re running a loader in Texas dust.

Source Validity: OEM Factory Print

This is not an aftermarket rehash. The title page reads “Allis-Chalmers Corporation” and notes the joint venture with FIAT S.p.A. after 1974. The original document was printed by Fiat-Allis Construction Machinery Inc. in Springfield, Illinois. I’ve been burned by third‑party manuals that skip pages or blur the part numbers – this one is clean, scanned from the original binding, every page legible. The instructions for ordering parts (page 3) tell you exactly how to give the serial number and part name. That’s the level of detail you only get from an OEM source.

Related manuals you might also need: Fiat-Allis HD41 Parts Catalog – 370-Page OEM Factory Manual, Fiat-Allis 12G-B 1979 Parts Catalog – OEM Factory Manual 337 Pages, Fiat-allis 6G Parts Catalog – OEM Factory Manual 559 Pages. For a broader look at equipment documentation standards, see the Automotive Industry Overview. Automotive Industry Overview also covers similar manufacturing practices.

Frequently Asked Questions

Does this catalog include torque specifications?

No. This is a parts catalog, not a service manual. It lists part numbers and exploded views, not tightening torques.

How do I find the part number for the hydraulic pump?

Go to the “Hydraulic Pump” section starting on page 160. The exploded diagram labels each component with the factory part number. Match your machine’s serial number to the correct revision.

Can I use this catalog for a 645B or 645C model?

This catalog is specific to the 645 M model (S/N 8001-9176). The 645B and 645C use different axle housings, brake assemblies, and hydraulic components. Ordering parts from this catalog for those models will likely result in incorrect parts. You need the manual matched to your machine’s serial number.

What is the difference between this and a service manual?

A service manual gives you repair procedures, tolerances, and troubleshooting. This parts catalog gives you the factory part numbers and exploded diagrams to order the correct components. You need both if you’re rebuilding a loader.

If you’re serious about keeping your Fiat-Allis 645 M running without chasing wrong parts, this catalog belongs on your bench. Access the Factory Manual now and put the OEM part numbers at your fingertips.