John Deere 4425 1990 Parts Catalog – OEM Factory Manual

Ever order a part for a 4425 combine, get it in the mail, and find it doesn’t match the hole it’s supposed to fill? That’s because you were working off a reprint or a parts list that skipped the grid numbers. I’ve seen it happen—the guy who wrote the aftermarket catalog never actually turned a wrench on a Deere. This John Deere 4425 1990 Parts Catalog changes that. It’s 804 pages of OEM part numbers, factory illustrations, and grid references so you get the right piece the first time. No guessing, no returns, no wasted time.

Primary Pictorial Index: Finding Parts by Visual Reference

Pages 1 through 5 of this catalog give you a primary pictorial index. You look at the drawing, find the part you need, and note the grid reference—something like 1B3 or 2D3. Then you flip to that grid page and get the exact part number. This method beats flipping through a parts counter computer that doesn’t recognize supersessions. Use the pictorial index first, every time. It’s indexed from the factory, not cobbled together by a third party.

Grid Index System: How to Navigate 804 Pages

Each section covers a major assembly. Section 01 covers the main combine body—engine, cab, header attachments. Section 02 covers rear axle, steering, electrical. The grid numbers like 01A02 or 02E21 point you directly to the illustration and part list. You don’t have to guess. If you need a hydraulic hose, check section 01F or 02D. The manual’s own index (the TOC) is laid out as grids: 01A through 01K, 02B through 02E. It’s consistent and repeatable. Aftermarket manuals skip this level of detail—they often merge assemblies and mislabel part numbers.

OEM Authenticity: Why Factory Documentation Beats Aftermarket Reprints

This is a scan of the original John Deere parts catalog from 1990—part number PC4204, dated 06-JUN-90. The PDF comes from an original print, not a recompiled aftermarket version. Reprints often drop grid numbers, flip illustrations, or use wrong part numbers. I’ve caught aftermarket catalogs listing a bolt for the wrong side of the engine. With this OEM version, you see the factory grid index exactly as Deere designed it. That matters when you’re ordering a $400 hydraulic pump and need the right mounting bracket.

Using the Parts Catalog with Other Manuals

Pair this catalog with a service manual for torque specs and procedures. For similar Deere machines, check out John Deere 2130 Parts Catalog – Factory Specs for Correct Part Identification and John Deere 4500, 4600, 4700 2000 Parts Catalog – OEM Grid Index. For larger combines, John Deere 9400, 9100, 9200, 9300 Parts Catalog – OEM Factory covers those platforms. If you want background on diesel engine theory, this Wikipedia article on diesel engines explains the fundamentals. Also read this Wikipedia article on diesel engines for additional context on fuel systems used in the 4425.

FAQ: Common Questions About the 4425 Parts Catalog

Is this only a parts catalog, or does it include repair instructions?

Parts only. No repair procedures or torque specs.

How do I find a part number if I don’t know the grid?

Use the primary pictorial index on pages 1–5. Locate the part in the drawing, note the grid reference like 1D11, then go to that grid page. The grid pages list part numbers and quantities. If you still can’t find it, check the alphabetical index at the back (the TOC doesn’t show a separate index, but typical Deere catalogs have one). Alternatively, you can search by known part name in the index if you have a general idea. The pictorial index alone covers most common components—engine, cab, drivetrain—so start there before flipping through the whole 804 pages.

What is the publication date? Does it cover later model changes?

1990. It covers the 4425 combine as built at that time. Later revisions may have different parts, but this gives the original specifications.

Can I use this for non-John Deere equipment?

No. It is specific to the 4425 combine.

If you’re tired of chasing wrong part numbers and dealing with returns, get the genuine document. Download the Factory Manual today.