Description

Case 33, 33S, 580CK 1976 Parts Catalog – Factory OEM Manual

Case 33, 33S, 580CK 1976 Parts Catalog – if you’re wrenching on a Case 580CK tractor with a 33 loader or 33S backhoe, you already know the pain of ordering the wrong part. The local parts counter guy reads off a screen, you get a box, and it doesn’t fit. That’s time, money, and a load of frustration. This factory Parts Catalog kills that guesswork cold. It’s the same binder Case mechanics used when these machines were new – 390 pages of OEM part numbers, exploded views, and quantity lists. No aftermarket reprint, no scanned blur. This is the real thing.

I’ve been turning wrenches for 28 years, and I can tell you the difference between a genuine Case catalog and a third-party PDF is night and day. Aftermarket catalogs leave out sub-assembly details, mix up hardware grades, and sometimes skip whole groups. This one doesn’t. It’s Case Corporation’s own F966 revision, dated 1976, and it replaces the older E966. Every page is laid out the way Case engineering intended: reference numbers, part numbers, descriptions, and the quantity required per machine. You’ll find the exact bolt, hydraulic fitting, or seal you need – no cross-referencing some aftermarket chart.

Exploded Views and Reference Numbers

Every assembly – from the loader frame to the backhoe swing cylinder – is shown in a “Exploded View.” Each part gets a reference number tied to a part number in the list. Indented parts under an assembly tell you what belongs to that sub-group. For example, the rear steering cylinder assembly (part A 55159) breaks down into the socket assembly, plugs, seats, springs, and clamp. The catalog tells you exactly how many of each you need. If you’re rebuilding a cylinder, you won’t have to guess the socket spring or ball seat part numbers. They’re right there, indented, with the quantity for that assembly. That level of detail saves you a return trip to the dealer.

Serial Number Location: Critical for Proper Identification

The first thing I check on any old machine is the serial number tag. The catalog includes a page (page 4 of the PDF) showing exactly where to find the model and serial number on the 33 Loader and the 33S/580CK. Why does that matter? Because Case made running changes during production. A 1975 580CK might use a different hydraulic pump than a 1977 model. The catalog’s serial number info tells you which revision of the parts list applies to your machine. If you skip this step and just order by model, you risk getting a part that was superseded or never fit your build. Don’t be that guy. Find the serial number, then flip to the index.

Does This Parts Catalog Cover All Models?

The cover explicitly says “MODEL 33 LOADER – 33 AND 33S BACKHOE FOR 580CK TRACTOR.” So if you have a 580CK with a 33 loader or a 33S backhoe, this is your catalog. It also covers the 33S backhoe variants. But it does not cover the 580CK tractor itself – that would be a separate chassis catalog. For the loader and backhoe attachments, though, every part is listed. There are indexes in the front (alphabetical by group) and in the back (numerical by part number) so you can search either way. If you’re working on a 33 or 33S that’s mounted on a 310G or 450 crawler, you might need the separate catalog: Case 33 Backhoe For 310G & 450 Crawler Parts Catalog. Similarly, the Case 33 & 34 Backhoes Parts Catalog A992 covers later revisions. But for a 580CK-based machine from the mid‑1970s, this F966 catalog is the correct document.

390 Pages of Genuine Case Part Listings

Let’s talk numbers. 390 pages, printed June 1976. That’s not a thin leaflet. Each page lists multiple part numbers with descriptions and the number required. The catalog also includes a revision record log so you can track if your copy has been updated. You’ll see page headers like “MODEL 33 LOADER – 33 AND 33S BACKHOE FOR 580CK TRACTOR” repeated throughout. Every illustration is crisp – these are original Case line drawings, not photocopies of faded originals. If you’re ordering seals, bearings, pins, or hydraulic components, the part number here is the one you give the dealer. Period.

Why an OEM Parts Catalog Beats Aftermarket

Aftermarket parts catalogs often omit the indented sub-assembly breakdown. You see a cylinder assembly listed but not the individual components inside it. That forces you to buy the whole assembly when you only need a $5 seal. Case’s catalog gives you the breakdown. Also, the OEM document includes the official Case part numbers, which are often superseded or updated. Aftermarket sources may list old numbers that are no longer available. With this catalog, you can look up the current supersession if needed, but at least you start with the correct baseline. One more thing: the catalog clearly states the correct fastener specifications – like HHCS 1/2″-20 NF x 2-1/4″ – so you’re not guessing thread pitch. That matters when you’re torquing a hydraulic line bracket. I’ve seen stripped threads from using a 1/2″-13 bolt where a fine thread belonged. This catalog prevents that.

If you’re serious about keeping your old Case running, pair this parts catalog with the factory service manual. The Case Model 33 Backhoe Operators Manual covers daily operation, but for parts ordering, this is the one. For a broader context of equipment documentation standards, you can read about Automotive Industry Overview. The reliability of OEM data is something the Automotive Industry Overview also underscores.

Get the Right Part Number Before You Order

Before you call your Case dealer, open this catalog. Find the assembly, locate the reference number, and read the part number. Write it down exactly as shown. Then verify your machine’s serial number range. If the catalog shows a note for serial number breaks, pay attention. That five minutes of lookup will save you a week of waiting for the wrong part. And if you’re buying used or aftermarket parts, having the OEM part number gives you a cross-reference tool. You can search that number online and find equivalent brands. But I still prefer genuine Case parts when available – they’re hardened correctly, the threads are rolled, and the dimensions match the drawings.

Q: Does this catalog include torque specs for bolts?

No. This is a parts catalog, not a service manual. It lists parts, quantities, and illustrations. Torque values would be in the corresponding shop manual.

Q: Will this work for a Case 580C or 580D?

The catalog explicitly covers the 580CK tractor with the 33 loader and 33S backhoe. The 580C and 580D are different series. They may use different hydraulic or structural parts. You need the catalog specific to your model. Check the serial number and model nameplate.

Q: How do I know if my copy has the latest revisions?

The first page includes a revision record log. If previous owners inserted updated pages, the log will show revision numbers and dates. The base catalog is F966, issued June 1976. Any later pages would have the same page number with a higher issue date. If the log is blank, you have the original print. That’s still better than aftermarket, but be aware of later supersessions at the dealer.

Q: Is this a PDF format or a printed book?

You are purchasing a digital access of the factory PDF. You can print pages as needed. We recommend printing the serial number location page and the index pages for quick reference in the shop. Keep the full PDF on a tablet or laptop. The file is searchable, which makes finding part numbers fast.

Don’t waste another afternoon chasing parts that don’t fit. Access the Factory Manual now and get the exact OEM part numbers for your Case 33, 33S, or 580CK. Your toolbox – and your wallet – will thank you.