Description

John Deere 8820, 844 1991 Parts Catalog

I’ve seen too many guys order a feeder house chain for their 8820 combine, get it three days later, and find out it’s the wrong pitch because they guessed from an aftermarket chart. That’s exactly why this John Deere 8820, 844 1991 Parts Catalog is the only paper I trust when I’m putting together a parts order. It’s the original factory book, published in 1991, running 1076 pages of grid-indexed parts breakdowns—not a scanned reprint from some third party. If you work on these machines, you need the OEM reference, not a photocopy of a photocopy.

What This Parts Catalog Actually Contains

This catalog is organized by the John Deere grid system—01 through 03, each with subsections A through G. Look at the Table of Contents: Section 01 covers the entire combine from A (engine) to G (electrical). Section 02 handles the separator and cleaning area. Section 03 covers the header and corn head attachments. Each subsection like 01A02 gives you a specific part location diagram. You don’t flip through randomly; you go to the grid, find your part number, and order. Page 10-1 notes that Titan II combine parts (serial numbers 610701 and up) are also included, and the catalog covers the 6466-03 export machine as well.

7 Main Sections in the Grid Index

The grid index divides the combine into seven logical sections—engine, power train, feeder house, separator, cleaning, electrical, and cab/hydraulics. Each section has its own lettered subsections. For example, Section 01A covers engine parts – cylinder head, block, turbocharger. Section 01B covers the fuel system. If you’re tracking down a injector line for the turbocharged 466 cubic inch diesel, you’d start at subsection 01B07 or 01B08 depending on your engine serial. The catalog cross-references the serial number range so you get the exact updated part, not a supersession that doesn’t fit.

Serial Numbers: Pinpointing Your Machine Vintage

One thing that separates OEM from aftermarket: serial number documentation. This catalog tells you exactly where to find the combine serial number plate (page 10-3: rear left-hand upright on early combines, right side of tool box on later ones) and the engine serial number plate (right side of block). It breaks down the coding: for example, E8820564100H means Equipment, 8820 model, separator serial 564100, built at Harvester Works. Later PIN plates use H08820X564101. Without that info, you order parts for a 1989 machine when yours is a 1992. This catalog gives you the key.

Why an OEM Catalog Beats Aftermarket Copies

I’ve owned aftermarket parts catalogs that merged two different model years and labeled them as one. That doesn’t happen here. John Deere issued this catalog in March 1991 with revision markings (notice the “05-MAR-91” on the bottom of each page). Every change—like the addition of Titan II parts—is noted directly on the page. Aftermarket reprints often omit the note about 50A Series Row-Crop Head or Three-Roller Belt Pickup references. This catalog includes cross-references to PC-1223, PC-1549, and others so you can order the correct head parts separately. When I’m ordering parts for a customer’s combine, I don’t want to gamble on a copy. If you want to understand the diesel engine specs, this Wikipedia article on diesel engines is fine for basic theory, but for actual part numbers, you need the factory grid.

For a deeper dive into the engine controls and diagnostics, this Wikipedia article on diesel engines covers the combustion principles, but remember: that won’t tell you which piston ring set to order. This catalog will.

Parts Ordering: Avoiding the Wrong Part

Every subsection lists the part number, description, and quantity needed. For example, if you need a belt for the main drive, look up Section 02F—the drive and belt section. The grid numbers like 02F01 through 02F11 guide you to the correct diagram. Then match your machine’s serial number against the column. That’s how you avoid the “I ordered four of these but only two fit” problem. The catalog also tells you if a part has been superseded by a newer number. When you combine this manual with the John Deere 6620 7720 8820 1978 Service Manual for repair procedures, you have a complete setup. For identifying engine components, the John Deere 2130 Parts Catalog – Factory Specs for Correct Part Identification covers a different vintage but uses the same grid logic. If you’re managing multiple machines in a fleet, the John Deere 4500, 4600, 4700 2000 Parts Catalog – OEM Grid Index follows the same family pattern.

Does this catalog include parts for the 844 corn head?

Yes.

How do I find the correct part number for my 8820 combine?

Start with the serial number (page 10-3). Then go to the appropriate grid section. The catalog is indexed by serial number range and subsection letter.

Can I use this for a Titan II combine?

Yes. The catalog includes Titan II combines with serial numbers 610701 and higher, as noted on page 10-1. Parts information for those machines is integrated into each section.

How do I read the combine serial number plate to identify my machine’s vintage?

Early combines (up to serial 564100) have the plate on the rear left-hand upright. The format, e.g., E8820564100H breaks down: E for equipment, 8820 for model, 564100 for separator serial, H for Harvester Works. Later combines (564101 and up) use a Product Identification Plate (PIN) near the right side of the tool box, with two lines: first line H08820X564101 (H0=Harvester Works, 8820=model, X=configuration, 564101=sequential number), second line says COMBINE. The engine serial number plate on the right side of the block uses a 16-digit code like 6466TH01227599RG – 6 cylinders, 466 cubic inches, turbocharged intercooled diesel, Harvester Works, engine version 01, serial 227599. This catalog uses those serial numbers to assign the correct parts in each subsection. Page 10-3 covers this in full.

If you are tired of cross-checking three different websites to get a part number correct, stop guessing. Access the Factory Manual and keep it on your tablet or print it out. You will save time and money the first time you look up a part for your John Deere 8820 or 844 corn head. This is the OEM source. Use it.