John Deere 7721 Combine Parts

7721 parts and accessories

The John Deere 7721 combine, produced from 1977 to 1984, was a popular choice for farmers due to its reliable performance in various grain harvesting applications. Powered by a John Deere diesel engine generating approximately 155 HP, the 7721 offered header widths ranging from 13 to 20 feet, enabling efficient harvesting. This model featured a conventional cylinder separator known for its durability and ability to handle tough crop conditions.

The John Deere 7721 combine harvester was introduced in 1977 and remained in production until 1984. It became a staple on many farms due to its robust design and adaptability to different crops. The 7721 is powered by a John Deere 6466A 7.6L (466 ci) 6-cylinder diesel engine, delivering around 155 horsepower. This engine provides ample power for the combine's operations. The threshing and separating system utilizes a conventional cylinder design, featuring a 40-inch wide cylinder and a walker system for grain separation. The grain tank holds approximately 120 bushels, and the unloading auger allows for a respectable unloading rate of around 50 bushels per minute. Available header widths ranged from 13 to 20 feet, providing options for different field sizes and crop types. While chopper/spreader options varied, many operators equipped their 7721s with straw choppers to manage residue effectively. The cab offered basic comfort features for the time, providing a decent working environment for the operator. The John Deere 7721 excels at harvesting grains such as wheat, soybeans, and corn, making it a versatile machine for diverse farming operations.

Specifications

Engine	John Deere 6466A 155 HP 7.6L Diesel
Separator Type	Conventional - 40-inch wide cylinder
Grain Tank	120 bushels
Unloading Rate	50 bu/min
Header Widths	13-20 ft
Fuel Capacity	75 gallons
Weight	16,500 lbs
Years Produced	1977-1984

Maintenance Tips

Concave Adjustment: Regularly check and adjust the concave clearance based on the crop type and condition to optimize threshing performance and minimize grain loss.
Belt and Chain Tension: Inspect all belts and chains for proper tension and wear. Replace worn components and adjust tension according to the operator's manual to prevent slippage and component failure.
Sieve and Chaffer Cleaning: Clean the sieves and chaffer screens frequently to remove debris and ensure proper airflow for effective grain cleaning.
Bearing Greasing: Grease all bearings regularly according to the recommended service intervals to prevent premature wear and ensure smooth operation of rotating components.

History & Background

Introduced in 1977, the John Deere 7721 was part of John Deere's line of conventional combines designed for efficiency and reliability. It offered improvements over previous models in terms of power and capacity. The 7721 solidified John Deere's position as a leading manufacturer of agricultural harvesting equipment during its production years.