Production years
1969-1978
John Deere combine ยท 1969-1978
John Deere 6600 Combine
The John Deere 6600 is a popular mid-size conventional combine of the New Generation era. It earned a lasting reputation as a capable, mechanically straightforward grain and corn machine, and later examples received more engine power.
Threshing system
Conventional cylinder, concave, and straw walkers
Engine
John Deere six-cylinder diesel; early 329 cu in and late 404 cu in versions, about 104-120 hp
Grain tank capacity
About 110 bu standard; extensions increased capacity
John Deere 6600 specifications
| Production years | 1969-1978 |
|---|---|
| Threshing system | Conventional cylinder, concave, and straw walkers |
| Engine | John Deere six-cylinder diesel; early 329 cu in and late 404 cu in versions, about 104-120 hp |
| Grain tank capacity | About 110 bu standard; extensions increased capacity |
| Header compatibility | Commonly 13-16 ft grain platforms; 4-row corn heads |
| Weight | Approximately 12,000 lb without header |
| Defining specification | 44-inch-wide separator |
What the 6600 is used for
The 6600 was built for the mixed grain and row-crop farms of its era, harvesting wheat, oats, soybeans, and corn with modest-sized headers. SideHill and later rear-wheel-drive options broadened its usefulness in difficult terrain or softer fields.
It is now best suited to small acreages, specialty crops, farm demonstrations, and collectors who still want a usable vintage combine. Owners value its accessible mechanical systems and its importance in Deere combine history.
Why the John Deere 6600 stands out
The 6600 was a high-selling New Generation Deere combine and helped establish the layout used by later Deere conventional machines. It is admired for simple serviceability, strong parts interchange within its family, and continued enthusiast and salvage-parts support.
Buying a used John Deere 6600
Verify which engine is fitted because early 329 diesel and late 404 diesel machines differ in power and related components. Inspect cylinder bars and concave, straw walkers and crank bearings, feederhouse chain and floor, shoe and sieve bushings, belts, variable-speed drives, brakes, final drives, and unloading-auger flighting; check machine hours against its overall wear and confirm specifications with TractorData.com and Deere records.
John Deere 6600 frequently asked questions
What years was the John Deere 6600 combine built?
The 6600 was built from 1969 through 1978.
How much horsepower does a John Deere 6600 have?
Early machines were commonly rated around 104 hp, while later 404-diesel versions are commonly cited near 120 hp.
Is a John Deere 6600 still a good small-farm combine?
Yes, if it is mechanically sound and local parts support is available, but its capacity is modest by modern standards.
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.