The John Deere 9770 STS is a versatile and powerful combine harvester known for its robust engine, advanced threshing and separation technology, and balanced performance.

It features a strong diesel engine, large fuel capacity, and well-designed components optimized for efficient grain harvesting.

Overview

The John Deere 9770 Sts Combine is part of John Deere’s STS (Single-Tine Separator) series combines, designed for high capacity and smooth threshing with improved grain quality and reduced losses.

It is widely used in large-scale farming for its productivity and reliability.

Specifications

  • Engine: John Deere PowerTech Plus 6090HH008, 9.0L, 6-cylinder diesel

  • Engine Power: Approximately 275 to 300 HP

  • Fuel Capacity: 945 liters (250 gallons)

  • Transmission: Hydrostatic transmission with 3 forward speeds

  • Drive: 2WD, self-propelled

  • Front Tires: Typically 800/70 R38

  • Rear Tires: 28L-26

  • Separator Capacity: Effective in separating with STS rotor system

Engine Details

The 9.0L PowerTech Plus diesel engine provides the John Deere 9770 Sts Combine with high torque and fuel efficiency, optimized for continuous heavy-duty fieldwork.

The water-cooled engine ensures reliable operation under various conditions.

Key Features

  • STS rotor threshing system for efficient grain separation and high threshing capacity.

  • Large grain tank and unloading system for efficient operations.

  • Premier cab with advanced controls for operator comfort.

  • Advanced cleaning system for better grain quality and less waste.

  • High-capacity hydraulic system and strong frame construction.

Performance

The jd 9770 sts combine excels in medium to large-sized fields, offering consistent threshing and separation with minimal grain damage.

It balances weight and power well, making it agile compared to some newer, heavier models.

Operator comfort and control are priorities with a spacious, ergonomic cab featuring advanced controls and a CommandView II interface, which includes GPS integration, automatic settings like AutoTrac, and sensors for yield and moisture monitoring.

The jd9770 combine also has a large grain tank with a volume of approximately 10,600 liters (300 bushels) and a high unloading rate, facilitating continuous operation.

Weight and Dimensions

  • Operating weight: Approximately 14,850 kg (32,771 lbs)

  • Length: Around 9.4 meters (31 feet)

  • Width: Varies with headers but typically around 4 meters (13 feet)

  • Height: About 4 meters (13 feet)

Oil and Fluid Capacities

  • Engine oil capacity: About 29 liters (7.7 gallons)

  • Cooling system: Approximately 53 liters (14 gallons)

  • Transmission fluid: Approximately 9.6 liters (10 quarts)

Common Problems

  • Rotor and concave wear over time which may affect threshing efficiency.

  • Hydraulic system leaks or failures due to age and use.

  • Electrical issues in some models related to sensor connections or wiring.

  • Regular maintenance needed for air filters and fuel systems to avoid downtime.

Price Range

The John Deere 9770 STS combine was produced primarily during the model years from 2007 to 2011.

This range represents the core production period when this model was sold new, with most used units currently available on the market falling within these years.

Focusing on this production range provides a clear context for specs, features, and common issues relevant to the John Deere 9770 STS combines in operation today.

Used units from around 2007 to 2011 commonly range in price from $70,000 to $120,000 depending on condition, hours, and additional equipment options.

Conclusion

The John Deere 9770 STS combine remains a reliable and effective machine for grain harvesting, favored for its powerful engine, efficient rotor separation system, and balanced design.

Overall, the John Deere 9770 STS combine is celebrated for its durability, productivity, advanced technological features, and operator-friendly design, making it a trusted choice for medium to large farming operations during its production years from 2007 to 2011.