John Deere 9770STS Combine Parts

9770STS parts and accessories

The John Deere 9770STS combine, manufactured from 2007 to 2010, offered farmers a reliable and productive harvesting solution. Powered by a robust John Deere PowerTech engine producing around 360 HP, this combine was known for its Single Tine Separator (STS) rotary system. It accommodated header widths up to 35 feet, making it popular for handling large acreage of wheat, corn, and soybeans.

The John Deere 9770STS was introduced in 2007 as part of the Single Tine Separator (STS) combine series, building upon the success of previous models like the 9660STS. Production continued through 2010. The 9770STS is equipped with a John Deere PowerTech 9.0L six-cylinder diesel engine delivering approximately 360 horsepower. Its rotary separation system features a 31-inch diameter rotor, excelling at threshing and separating grain from the material other than grain (MOG). The grain tank boasts a capacity of 315 bushels, and the unloading auger delivers grain at a rate of 3.3 bushels per second (198 bu/min). Available header widths range from 25 to 35 feet, allowing for efficient harvesting in various field conditions. Chopper and spreader options allowed for customizable residue management. The cab offered enhanced operator comfort and control with features such as the GreenStar yield monitoring system. It performed exceptionally well in harvesting wheat, corn, soybeans, and other small grains.

Specifications

Engine	John Deere PowerTech 9.0L 360 HP Diesel
Separator Type	STS Rotary - 31-inch diameter rotor
Grain Tank	315 bushels
Unloading Rate	198 bu/min
Header Widths	25-35 ft
Fuel Capacity	200 gallons
Weight	32,000 lbs (approximate)
Years Produced	2007-2010

Maintenance Tips

Concave Adjustment: Regularly inspect and adjust concave clearance based on the crop being harvested to optimize threshing and minimize grain damage.
Belt and Chain Tension: Check and maintain proper tension on all belts and chains, especially the feeder house and separator drives, to prevent slippage and premature wear.
Sieve and Chaffer Cleaning: Clean sieves and chaffers regularly to ensure proper grain separation and minimize losses over the back of the combine.
Bearing Greasing: Follow the recommended greasing schedule for all bearings throughout the combine, paying particular attention to those on the header, separator, and unloading auger.

History & Background

The John Deere 9770STS was a key model in the STS combine line, representing a refinement of rotary separation technology for improved grain quality and reduced losses. It was introduced in 2007 and was manufactured until 2010. It continued John Deere's tradition of innovative combine design, improving harvest efficiency.

Frequently Asked Questions

What engine is in the John Deere 9770STS?

The John Deere 9770STS is powered by a John Deere PowerTech 9.0L six-cylinder diesel engine producing approximately 360 horsepower.

What is the grain tank capacity on a 9770STS?

The John Deere 9770STS has a grain tank capacity of 315 bushels and an unloading rate of 198 bushels per minute (3.3 bu/sec).

What type of separator does the 9770STS have?

The John Deere 9770STS utilizes a Single Tine Separator (STS) rotary system featuring a 31-inch diameter rotor for threshing and separating grain.

What are common parts needed for the 9770STS?

Common wear parts for the John Deere 9770STS include concaves, rasp bars, feeder house belts, chains, bearings, unloading auger flighting and fingers, and sickle sections for the header.

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