Production years
1979-1984
John Deere combine ยท 1979-1984
John Deere 4420 Combine
The John Deere 4420 is a compact conventional combine from the early 1980s, built for smaller farms and fields where a large machine was unnecessary. It is valued as a simple four-walker Deere for modest corn, soybean, wheat, and oat acreage.
Threshing system
Conventional cylinder and four straw walkers
Engine
John Deere 329 cu in naturally aspirated six-cylinder diesel, approximately 115 hp commonly cited
Grain tank capacity
Approximately 110 bu
John Deere 4420 specifications
| Production years | 1979-1984 |
|---|---|
| Threshing system | Conventional cylinder and four straw walkers |
| Engine | John Deere 329 cu in naturally aspirated six-cylinder diesel, approximately 115 hp commonly cited |
| Grain tank capacity | Approximately 110 bu |
| Header compatibility | John Deere 200 Series grain platforms and 40/50 Series row-crop heads; commonly paired with 13-15 ft platforms or three- to four-row corn heads |
| Weight | Approximately 15,000 lb without header |
| Defining specification | Compact four-walker conventional design |
What the 4420 is used for
The 4420 was aimed at smaller grain and row-crop operations that needed a self-propelled combine with manageable size and straightforward servicing. Its conventional system works across common cereal crops, soybeans, and modest corn acreage when the machine is correctly adjusted.
It remains useful for hobby farms, seed plots, small acreages, and collectors. Its narrow working width and smaller headers can be an advantage in small fields, on narrow roads, and in older storage buildings.
Why the John Deere 4420 stands out
The 4420 is popular with small-acreage owners because it is compact, recognizable, and mechanically uncomplicated compared with later combines. Deere dealer, aftermarket, and salvage support can help keep one operating, but capacity is limited compared with larger contemporary machines.
Buying a used John Deere 4420
Prioritize condition of the cylinder and concaves, straw walkers and bearings, feederhouse chain and floor, shoe bushings, elevators, grain-tank augers, belts, clutches, and final drives. Check the engine, hydrostat, cab air conditioning, wiring, and header-drive components, and buy the best-maintained machine and header combination rather than relying on low hours alone.
John Deere 4420 frequently asked questions
What engine is in a John Deere 4420 combine?
It uses a John Deere 329 cubic-inch naturally aspirated six-cylinder diesel, commonly cited at about 115 hp.
What size header can a John Deere 4420 run?
It is commonly paired with 13-15 ft grain platforms and three- or four-row corn heads, subject to crop and field conditions.
Is a John Deere 4420 a good combine for a small farm?
Yes, if its capacity matches the acreage and it is in sound mechanical condition; it is a practical small-field and limited-acreage machine.
Specifications are commonly cited figures for general reference; exact figures vary by year and serial number, so confirm against TractorData.com and the machine's records. Values and prices of used combines vary by condition, hours, and region. Page updated Aug 4, 2026.