Description

Allis-chalmers 840C 1982 Parts Catalog – Factory OEM Breakdown

I’ve been wrenching for 28 years, and I’ve seen more aftermarket parts catalogs that are wrong than I care to count. If you’re trying to keep an Allis-chalmers 840C loader running – a 1982 model that’s still pulling its weight on a farm or job site – you need the real factory breakdown. The ALLIS-CHALMERS 840C 1982 Parts Catalog from AutoRepairManuals gives you 221 pages of OEM part numbers, exploded diagrams, and the exact reference material the dealers used. No generic cross-reference garbage.

221 Pages of Factory Part Numbers and Diagrams

That page count – 221 – covers every major system on the 840C loader. The foreword explains how to use the alphabetical and numerical indexes. You flip to the index, find “Brake”, and the page numbers jump out at you. Page 135 for brake pedals, page 137 for master cylinder. No guessing. The illustrations are on the left, text on the right, with item numbers matching the part list. Common hardware like bolts and lube fittings are indented under the assembly they belong to – you only order the hardware if it’s specifically listed. That detail alone saves you from ordering a box of cap screws you don’t need.

Brake System: Pedals, Linkage, Master Cylinder

The Brake section – pages 135 through 137 – breaks down the pedals, linkage, and master cylinder assembly. If you’ve ever tried to rebuild a master cylinder from an aftermarket diagram that swapped the ports, you’ll appreciate this. The OEM catalog shows the exact part numbers for the linkage rods, return springs, and seal kits. You don’t need a Valve diagram for the brake system because the hydraulic control is covered elsewhere. But the brake section is clean: three pages, three sub‑assemblies, no filler.

Does This Manual Cover the Drive Train?

Yes, and it does it the right way. The Drive Train section alone runs from page 99 to page 129. It includes the transmission, torque converter, main shafts, clutches, reduction shaft, and all the control and regulator Valve groups. Pages 103–105 cover the torque converter case, stator, and turbine. If you’re pulling the transmission on an 840C, you need the part numbers for the converter pump assembly (page 111) and the screen & accumulator (page 113). Without this catalog, you’re guessing what fits.

Valve Groups and Hydraulic Attachments

Hydraulic systems on loaders are a nightmare if you mix up spool valves. The catalog lists the auxiliary hydraulic & valve group on page 221, plus the control valve assembly under Axle, Steering & Wheels. The attachments section (pages 215–221) covers buckets, counterweights, arm locks, and frame locks. Need the correct arm lock bracket? Page 217. The OEM part number is right there next to the illustration. That’s how you keep a loader working without turning a two‑hour job into a week of chasing wrong parts.

Why OEM Beats Aftermarket for the 840C

Aftermarket parts catalogs for agricultural equipment from the 1980s are notorious for re‑labeling parts or skipping discontinued items. This is the factory document – printed by Allis‑Chalmers in July 1982, part number 9006498. The illustrations are direct scans of the original engineering drawings. When you order a part number from this catalog, you get the piece that fits. No “equivalent” nonsense. The Automotive Industry Overview on Wikipedia notes that OEM documentation is the backbone of proper maintenance – and this catalog is exactly that.

3 Sections You’ll Use Most

First, Air Intake & Exhaust System (pages 39–41) – air cleaner, manifolds, muffler. Second, Axle, Steering & Wheels (pages 139–149) – front and rear axles, differential, planetary gear, power steering, tires. Third, Electrical & Instruments (pages 63–81) – wiring, lights, alternator, starting motor. Each section lists every part with quantities. For example, the instrument panel wiring is on page 69. You can order the exact harness without disassembling the dash.

Questions About This Parts Catalog

Is this a shop manual with repair procedures?

No. This is a Parts Catalog – it lists part numbers and assemblies, not step‑by‑step repair instructions. You use it to identify and order correct OEM parts.

Does it include the engine internal parts?

This edition does not cover the engine block itself. It covers the cooling system, air intake, electrical, and all loader‑specific systems. For engine parts you need the separate engine manual.

Will the diagrams help me reassemble something I took apart?

Yes, especially the exploded views of the drive train and brake assemblies. They show how parts stack together, which is useful when you’re staring at a pile of bearings on the bench.

Are the part numbers still active?

Some are, some are superseded. The catalog gives you the original number, which you can cross‑reference with current dealer inventories. It’s your starting point.

Browse other factory manuals for related Allis‑Chalmers equipment: Allis-Chalmers HD-6EP Parts Catalog – Factory OEM 374 Pages and Allis-chalmers HD21A 1965 Parts Catalog – Factory OEM. The Automotive Industry Overview reminds us that accurate parts documentation keeps machinery safe and productive.

If you’re tired of guessing part numbers and returning wrong parts, get the document that’s been in dealer service bays since 1982. Access the Factory Manual from AutoRepairManuals.