Description

Allis-chalmers H-4, HD-4 1975 Parts Catalog – Factory OEM

Let me say this straight: if you’re trying to keep an Allis-Chalmers H-4 or HD-4 crawler running without a proper parts catalog, you’re asking for headaches. I’ve seen guys waste half a Saturday ordering the wrong brake band or guessing which valve fits the diverter. That’s time you don’t get back. This Allis-chalmers H-4, HD-4 1975 Parts Catalog is the factory original – 217 pages of part numbers, breakdowns, and exploded views that match exactly what came off the assembly line. Not a reprint, not a scanned aftermarket copy. OEM litho from Allis-Chalmers themselves, reprinted 11-75. If you care about getting the right part the first time, this is where you start.

You’re probably wondering what makes this file worth the access versus some free PDF off a forum. Here’s the difference: the factory catalog lists hardware quantities, common attaching parts, and assembly packages with the exact part numbers. The foreword on page 1 explains how to read the listings – common bolts, nuts, and cotter pins are listed under the part they attach to. That matters when you’re rebuilding a final drive or replacing a crankshaft. You won’t find that level of detail in a third-party parts list. The manual also gives you the serial number locations and proper ordering instructions. Think of it as insurance against shipping the wrong part back and forth.

Brake Band & Linkage – Factory Part Numbers

One of the first things I look for in any crawler catalog is the brake section. The index shows BRAKE BAND & ARM and BRAKE LINKAGE and BRAKE PEDALS & LINKAGE. Each one has its own part number and illustration. If you’ve ever tried to match a brake band by eye, you know how easy it is to grab the wrong one. The catalog shows the exact assembly, so you can verify before you order. The same goes for the valve groups – CONTROL VALVES section lists end sections, main relief, and individual valve sections (A, D, E, F, J). That level of granularity saves you from buying a whole assembly when all you need is one valve section.

Diesel vs Gasoline – Separate Listings for H-4 and HD-4

Both the H-4 and HD-4 came with either a diesel or gasoline engine. The catalog separates every major group – AIR CLEANER, CYLINDER BLOCK, CYLINDER HEAD, CRANKSHAFT, FLYWHEEL, FUEL TANK, and more – into diesel and gasoline versions. You don’t have to guess. Flip to the section you need, match your engine type, and you’ll see the correct part number. For example, the FUEL INJECTION PUMP (diesel) and the CARBURETOR (gasoline) are two entirely different sections. That’s how a real factory catalog is built. No generic “fits both” nonsense.

217 Pages – What’s Covered in This Index

The table of contents reads like a checklist of every major system on these crawlers. Here are some highlights from the actual index: ADAPTOR PLATE (diesel/gasoline), AIR FILTER INDICATOR, AXLE final drive, BATTERY GROUP, CARBURETOR COMPONENTS, CLUTCH SHIFTER, CONNECTING ROD, CONSOLE SHELL & SHUTTLE CLUTCH CONTROL, CONTROL VALVES, DECELERATOR, DISTRIBUTOR, DIVERTER (for 164 & 1600 backhoe), DRAWBAR, DRIVE SHAFT & RING GEAR, ETHER STARTING SYSTEM (diesel), EXHAUST MANIFOLD, FAN DRIVE SHAFT, FINAL DRIVE HOUSING, FRONT PLATE, HITCH (3-point lift arm with hydraulic ram, lift bars, lift links, lift shaft & supports), HOLLOW CLUTCH SHAFT, HYDRAULIC HOUSING & GEAR, HYDRAULIC PUMP, HYDRAULIC SYSTEM, IDLER GEAR ASSEMBLY, IDLER SHAFT & GEARS, IGNITION, and more. There’s also a numerical part number index at the back. That’s 217 pages of coverage.

Valve Section Details – Why OEM Matters

Take the CONTROL VALVES section. The catalog breaks it into: End Sections, Main Relief, Section valve (A), (D), (E), (F), and (J). If you order a valve section from a generic aftermarket supplier, you might get a close-enough replacement that doesn’t seat right. The OEM catalog gives you the factory part number, and you can cross-reference it with the illustration. The same applies to the DIVERTER section for hydraulic group – specific to the backhoe models. There’s no substitute for having the original drawing in front of you when you’re standing at the parts counter.

Who Needs This Parts Catalog?

If you own an H-4, HD-4, or work on them, this catalog is for you. DIY mechanics restoring a crawler in a home garage will save hours by looking up correct part numbers before ordering. Workshop owners who maintain a fleet of old Allis-Chalmers equipment will want this on the bench for every repair. Even if you’re just tracking down a missing piece for a 3-point hitch or a hand brake control, the factory breakdowns are worth the price. Beginners: don’t try to piece together a parts list from online forums. You’ll get mislabeled parts and wrong dimensions. Use the real catalog.

Another thing that separates this from reprints: the factory catalog includes the foreword with order instructions and serial number locations. For example, the fork lift serial number is on the R.H. side of the frame over the final drive housing near the brake pedals. The mast serial number is inside the bottom channel iron of the mast assembly. That kind of specific location data is missing from aftermarket copies. Plus, the catalog clearly states R.H. and L.H. from the operator’s seat facing forward. That matters when ordering final drive parts or brake linkage.

Does This Manual Cover the Fuel System?

Yes. FUEL FILTER (diesel), FUEL INJECTION PUMP (diesel), FUEL PUMP (gasoline), FUEL TANK (both engines), and FUEL TANK FILTER (both) are all in the index. You’ll find part numbers for the injector components and the carburetor assembly.

What About the Hydraulic System?

The catalog has HYDRAULIC HOUSING & GEAR (split by diesel/gasoline), HYDRAULIC OIL FILTER (front), HYDRAULIC PUMP, and a dedicated HYDRAULIC SYSTEM section. Plus the DIVERTER and CONTROL VALVES for backhoe attachments. If you’re rebuilding a pump or replacing a valve spool, the exploded diagram is your roadmap.

Is This a Reprint or a Digital Scan?

It’s a digital scan of the original factory-printed catalog – the one marked “LITHO U.S.A.” and “FORM 1012402 Reprinted 11-75”. The quality is good enough to read part numbers and illustration callouts. It’s not a photocopy of a copy; it’s a direct scan from the original document. You get all 217 pages as a searchable PDF.

Can I Return It If It Doesn’t Help?

Digital documents are non-returnable, but I don’t expect you’ll want to return it once you see the level of detail. If you’re unsure, compare the index on this page with what you need. If your machine is an H-4 or HD-4 (any year up to 1975), this catalog covers the parts.

You’ve read enough to know this isn’t a generic parts list. It’s the factory document. If you want to stop guessing and start ordering the right parts, hit that access button. Access the Factory Manual now.

Related manuals you might need:
Allis-Chalmers H-4 HD-4 Parts Catalog
Allis-Chalmers HD-6EP Parts Catalog – Factory OEM 374 Pages
Allis-chalmers HD21A 1965 Parts Catalog – Factory OEM

External industry context: Automotive Industry Overview and Automotive Industry Overview – read about the broader machinery world if you’re interested.

Does this parts catalog include torque specs for bolts?

No. This is a parts catalog, not a service manual. It lists part numbers and assembly breakdowns, not torque values. You’ll need the separate service manual for that.

Can I use this for a 1976 model H-4?

The catalog was reprinted in 1975 to cover the H-4 and HD-4 models. If your machine is a 1976, most parts will be the same, but check your serial number against the catalog.

How do I find a part number quickly?

Use the numerical index at the back of the catalog. It shows every part number and the page where it appears. Or search the PDF for the part name from the alphabetical index.

What if I need a part that isn’t listed?

Contact an Allis-Chalmers dealer with your serial number. Some parts may be superseded or discontinued. The catalog is the starting point, not the final authority.