Description

Allis-chalmers H-3, HD-3 Parts Catalog

If you are restoring an Allis-Chalmers H-3 or HD-3 crawler tractor, the Allis-chalmers H-3, HD-3 Parts Catalog is the only way to get the factory part numbers. I have spent too many hours watching guys order a “fuel injection nozzle” and get the wrong one because they used a generic aftermarket list. This catalog ends that. 257 pages of OEM part numbers, grouped by system, with an index in the back. Page 1 gives you a general description and shows you where everything sits on the tractor – air cleaner, exhaust manifold, fuel tank, shuttle clutch control, hood, grille, instrument panel, operator seat, platform, track, truck wheel. That layout alone saves you from crawling under a machine with a tape measure.

You do not need to guess. Every part has an item number. Common hardware like bolts and nuts is listed right under the part they attach to. The foreword on page 2 tells you exactly how to order: supply tractor and engine serial numbers, model name, and a description or the old part. That is it. No phone tag with a dealer who reads off a different system. You bring this catalog, you point, you get the right piece.

Engine Parts Breakdown: Diesel and Gasoline

The index groups engine parts separately for diesel and gasoline models. Diesel section covers bearings, camshaft, connecting rods, crankshaft, cylinder head, fuel injection nozzle and lines, injection pump, oil pump, piston assembly, push rods, rocker arms, sleeves, valves (exhaust and intake), and water pump. Gasoline section adds carburetor, distributor, governor, ignition, tappets, and fuel pump. This is not a generic list – each part is tied to an Allis-Chalmers factory number. If you need a crankshaft kit or a valve cover gasket, the catalog tells you the exact item. No cross-referencing a third-party manual that swaps part numbers halfway through.

Clutch and Drive Shaft Components You Need to Identify

Under the CLUTCH heading: engine clutch, disc, gears (drive, intermediate, driven), back and pressure plates, snap rings, shaft, and pedal. DRIVE SHAFT & RING GEAR covers the carrier bearing, ring gear, drive shaft, and sleeve. These are the parts that take the most abuse on a crawler. When you have the clutch out and you are staring at a worn drive gear, you need to know if it is the drive, intermediate, or driven gear. The catalog lists each one with its item number. No more bin-diving with a caliper to match tooth counts. Allis-Chalmers HD-6EP Parts Catalog – Factory OEM 374 Pages covers a different machine, but the same principle applies – factory numbers or nothing.

257 Pages of Factory Part Numbers

This is a parts catalog, not a repair guide. Page count: 257 pages. The last section is a part number index that tells you on which page a number appears. If you lose the physical part and only have a number scratched on the old piece, flip to the index, find the page, and see what it belongs to. The index saves you from flipping through every section. The ATTACHMENTS section lists belt pulley, drawbar extension, drive shaft for rear winch, ether starting system, flexible drive shaft, grille screen, hour meter, low clearance muffler, pull hook, tool boxes, universal carrier bracket, and engine water heater. All with factory part numbers.

Why OEM Documentation Matters for Your Allis-Chalmers

Aftermarket catalogs take the original Allis-Chalmers illustration, reprint it badly, and then substitute a “universal” part number that may or may not fit. I have seen a reprint catalog list a gas engine part for a diesel application because the copy shop did not bother to check the model split. This is the original Fiatallis North America publication (one 71012408 EH). The foreword states: “For any additional copies of this catalog there will be a supplementing service charge of three dollars.” That is how you know it is the real factory document – they were charging for copies because the data has value. Compare that to a free PDF that was scanned from a third-generation photocopy. The differences in part numbers on page 73, for example, can cost you a week and a hundred dollars in return shipping. Allis-chalmers HD21A 1965 Parts Catalog – Factory OEM and Allis-chalmers HD16D, HD16DC 1970 Parts Catalog – OEM Factory Specs follow the same factory layout. If you work on multiple Allis-Chalmers models, you want the same level of detail.

Understand the Electrical System Parts Before You Order

The ELECTRICAL section splits diesel and gasoline. Each has battery, cables, generator, starting motor, voltage regulator, instrument panel (ammeter, gauges, key, lamp, switches), and headlamp assembly. The diesel section also includes a battery box and fuse; the gasoline section lists a battery tray and fuses separately. Small differences like the battery tray versus box can mean the wrong hold-down hardware. The catalog lists the exact brackets, cables, and harness part numbers. Do not assume a generator pulley from a gas model fits a diesel – they have separate listings. Automotive Industry Overview of how agricultural tractors were built in that era confirms that manufacturers used different electrical systems for gas and diesel because of compression ratios and starting loads. This catalog respects that difference.

Common Questions About the H-3 and HD-3 Parts Catalog

Does this catalog include parts for both the H-3 and HD-3 models?

Yes. The title page says H-3 & HD-3 Crawler Tractors. The index covers both, with separate diesel and gasoline sections where needed.

How do I use the part number index at the back?

The last section of the catalog is a numerical index of all part numbers. Each number is listed with the page or pages where that part appears. If you have an old part with a number stamped on it, look up that number in the index, turn to the listed page, and you will see the illustration and description. This is faster than scanning through 257 pages. The index also tells you the quantity used per assembly – something aftermarket lists often skip. For example, if the index says “6” next to a bolt, that means the assembly takes six of them. That keeps you from stopping mid-job to realize you are short by one.

Is this a reprint or an original factory document?

This is scanned from the original Fiatallis North America publication. It is not a retyped or reillustrated copy. The foreword and page numbering are intact.

What if I need a part that is not listed in the catalog?

Check the ATTACHMENTS and ASSEMBLIES & PACKAGED PARTS sections. Some optional equipment like the ether starting system or belt pulley drive are listed there. If it is still missing, you are likely looking at a part that was not originally offered for these models. The index will confirm whether the part number exists. Automotive Industry Overview of aftermarket sourcing shows that many parts for this era are interchangeable with later models – but without the factory catalog, you risk ordering a part that fits nothing.

Related Manuals:

• Allis-Chalmers HD-6EP Parts Catalog – Factory OEM 374 Pages
• Allis-chalmers HD21A 1965 Parts Catalog – Factory OEM
• Allis-chalmers HD16D, HD16DC 1970 Parts Catalog – OEM Factory Specs

Stop wasting time on parts that do not fit. Access the Factory Manual now and get the exact Allis-Chalmers part numbers for your H-3 or HD-3. 257 pages, every section indexed, OEM data from the original publisher.