JOHN DEERE 770 CH MOTOR GRADERS

Technical Description

The John Deere 770CH Motor Grader is powered by a John Deere POWERTECH 6081H turbocharged 6-cylinder diesel engine with 8.1 L displacement, delivering net power ranging from 165 hp at lower gears up to 205 hp at higher gears, with peak torque up to approximately 925 lb-ft at 900 rpm. This engine features an air-to-air aftercooler and operates at a maximum speed of about 2,000 rpm. The transmission offers eight forward and four reverse speeds, enabling travel speeds up to 25.8 mph. The grader employs a closed-center hydraulic system with variable displacement pumps, providing a flow rate around 55 gallons per minute and relief valve pressure near 2,550 psi. The machine's articulation allows a 25-degree frame steer and a front steering angle up to 47.5 degrees, with tandem oscillation totaling 32 degrees to enhance maneuverability and stability on slopes. The drawbar circle moldboard system supports a blade length typically between 12 to 14 feet, capable of a maximum depth of cut around 28.9 inches and lift above ground near 18.9 inches, with extensive side shifts and blade tip angles (40° forward, 5° backward). The scarifier includes nine shanks with an 84.1-inch working width and a penetration depth up to 11.1 inches. Operating weight for the 770CH stands near 31,500 lb, with fuel capacity around 106 gallons, supporting extended operation. The electrical system operates at 24 volts with a 55-amp alternator. Optional integrated 3D grade control systems with GPS/GNSS enable precise automatic blade control for enhanced grading accuracy and productivity.