John Deere 6620 Combine Parts

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The John Deere 6620 combine, produced from 1979 to 1988, was a popular conventional combine known for its reliability and straightforward design. It featured engine HP ranging from 155-175 and header widths up to 30 feet, making it a versatile machine for various farm sizes. Its conventional separator system provided efficient threshing and separation for a variety of crops.

The John Deere 6620 was introduced in 1979 as part of the 20 Series combine harvesters, replacing earlier models and establishing itself as a workhorse in the agricultural industry. Production continued through 1988. The 6620 was powered by a John Deere 6.8L (414 cu in) diesel engine, producing between 155 and 175 horsepower depending on the year. This combine uses a conventional threshing system, featuring a 6-bar, 38-inch wide cylinder for effective grain separation. The grain tank capacity is approximately 150 bushels, and the unloading auger could unload at a rate of roughly 45-50 bushels per minute. Available header widths ranged from 13 feet to 30 feet, allowing farmers to optimize harvesting for their specific field conditions. Chopper and spreader options were available to manage crop residue effectively. The cab was designed for operator comfort and included features such as air conditioning and adjustable seating. The 6620 excelled at harvesting a variety of crops, including wheat, soybeans, corn, and other small grains, making it a versatile choice for many farming operations.

Specifications

Engine	John Deere 6.8L (414 cu in) 155-175 HP Diesel
Separator Type	Conventional - 6-Bar, 38-inch wide cylinder
Grain Tank	150 bushels
Unloading Rate	45-50 bu/min
Header Widths	13-30 ft
Fuel Capacity	80 gallons
Weight	Approx. 16,000 lbs
Years Produced	1979-1988

Maintenance Tips

Concave Adjustment: Regularly check and adjust concave clearance to ensure optimal threshing and minimize grain loss. Follow the operator's manual recommendations for different crop types.
Belt and Chain Tension: Inspect belt and chain tension regularly. Loose belts and chains can cause slippage and reduced efficiency, leading to premature wear and damage.
Sieve and Chaffer Cleaning: Keep sieves and chaffers clean to ensure proper separation of grain from chaff. Regularly clean them to prevent blockages and maintain optimal performance.
Bearing Greasing: Follow the recommended greasing schedule for all bearings. Proper lubrication is crucial for extending the life of bearings and preventing costly repairs.

History & Background

The John Deere 6620 was released in 1979 as a component of the John Deere 20 series combine line. It refined the conventional combine design and offered increased horsepower and capacity compared to prior generations. The 6620 is remembered as a dependable and cost-effective option for many farmers.