Description

Allis-chalmers H-4, HD-4 1975 Parts Catalog

Ordering parts for a 1975 crawler tractor without the right numbers is a waste of time and money. You pull the old part, call the dealer, and get a “that number’s obsolete, maybe this one works?” Then the machine sits. I’ve seen it happen. The Allis-chalmers H-4, HD-4 1975 Parts Catalog stops that nonsense cold. Factory-original, 211 pages, arranged alphabetically with a numerical index at the back. You get the exact part number, the illustration, and the application (diesel or gasoline) for every component from the Brake band to the control Valve sections.

Using the Index: Where to Find Your Part

This catalog starts with an alphabetical listing of groups – Brake Band & Arm, Control Valves, Cylinder Head – then breaks each group down by engine type. Every group has its own illustration page right after the text. The foreword (page 3) explains how to read the entries: item numbers, common hardware listed under the part they attach to, and whether the part is part of an assembly or sold separately. You don’t need to flip randomly. The numerical index at the end lists every part number and the page where it appears. That saves you from buying a brake band that doesn’t fit because you guessed the width.

Brake Band & Arm: Factory Part Numbers

Look up Brake Band & Arm in the index. You’ll find the factory part number for the band assembly, the return spring, the anchor pin – all with the correct application for H-4 or HD-4. The manual specifies whether the part fits the diesel or gasoline version. No aftermarket cross-reference that may or may not match. If you’re rebuilding the steering clutch brakes, you need the right band thickness. This catalog gives you the OEM number to order. No substitutes.

Valve Sections: Hydraulic System Breakdown

The hydraulic system on these tractors uses control valves split into sections: valve A, valve D, valve E, valve F, valve J. Each section has its own entry in the catalog with the spool, spring, and seal part numbers. The Control Valves group also covers the main relief valve and end sections. If you’re rebuilding a backhoe valve – the diverter section for the 164 and 1600 backhoe is listed separately. You get the exact O-ring and backup ring sizes. No guessing which kit to buy.

Who Needs a 211-Page Parts Catalog?

If you own an H-4 or HD-4 crawler, this catalog is your base reference. DIY mechanics restoring a machine, home-garage enthusiasts keeping a vintage tractor running, even small shop owners who see these come in once a year – you all benefit from having the factory parts breakdown. The 1975 publication date means it’s the last major revision for these models. It supersedes the earlier Form TP-104. You get the updated part numbers for items like the Fuel Injection Pump (diesel) and Generator. The catalog also includes the Hitch group with lift bars, links, and hydraulic ram – everything you need to order the correct lift shaft support.

Verify Part Numbers with Factory Data

Aftermarket parts catalogs often copy from earlier versions or make assumptions. This is a direct OEM reprint from Allis-Chalmers Litho U.S.A. (Form 1012402, reprinted 11-75). Every part number traces back to the original engineering release. If you’re working on an H-4 with a gasoline engine or an HD-4 with a diesel, the Fuel Tank group, Air Cleaner hoses, and Exhaust Manifold are all listed separately. I don’t trust a third-party site that re-types part numbers. Use the factory source. For background on how manufacturer part numbering evolved, refer to Automotive Industry Overview.

Frequently Asked Questions

How do I find a part number in this catalog?

Use the alphabetical groups at the front, then check the numerical index at the back for the exact page.

Does this catalog include illustrations?

Yes. Each group has an illustration page immediately following the text. The foreword (page 3) explains that all illustrations follow the text of each section. This is critical for identifying the exact part shape and location. For example, in the Brake Linkage section, the illustration shows the pedal assembly, connecting rods, and return springs with item numbers matching the part list. Without the illustration, you might order the wrong lever. The catalog is designed so you never have to guess – you see the part and the number on the same page. That’s why having the factory original matters.

Related Manuals

• ALLIS-CHALMERS H-4 HD-4 1975 Parts Catalog
• Allis-Chalmers HD-6EP Parts Catalog – Factory OEM 374 Pages
• Allis-chalmers HD21A 1965 Parts Catalog – Factory OEM

If you’re ordering parts for these machines, you need the right numbers from the start. Access the Factory Manual now and keep a copy in your shop – paper or PDF – so the next time a brake band or valve section comes apart, you know exactly what to order.