JOHN DEERE 770A MOTOR GRADERS

Technical Description

The John Deere 770A Motor Grader features a robust 6-cylinder, turbocharged and intercooled diesel engine (model 6-466A) with a displacement of 466 cubic inches, delivering 150 hp (112 kW) net power at 2200 rpm and maximum torque of 465 ft-lbs at 1300 rpm. Its power shift transmission offers 8 forward and 4 reverse gears, enabling speeds up to 25.1 mph forward and 8.6 mph reverse. The machine’s overall length is 27.8 ft, width over tires 8.1 ft, and height to the top of the isomount cab is 10.5 ft, supporting a wheelbase of 19.6 ft and tandem axle wheelbase of 5.1 ft. The front axle provides 1.9 ft ground clearance with 30° total oscillation and 20° wheel lean for enhanced maneuverability, complemented by a 25° articulation angle and a tight 22 ft turning radius. The 12-ft wide moldboard has a height of 24 in and thickness of 0.9 in, allowing blade side shifts of 26.9 in left and right, with a maximum lift above ground of 17.1 in and blade tip angles of 44° front and 10° rear. The blade circle measures 59.1 in in diameter, rotates 360°, and shifts 33.6 in left and 32.1 in right. The hydraulic system uses a closed center variable displacement pump delivering 36 gpm, with a total hydraulic fluid capacity of 31 gallons. Operating weights range from a standard 30,260 lbs total to a maximum of 33,849 lbs, with fuel capacity at 70 gallons and a 24-volt electrical system supplying 42 amps from the alternator. Tire size is 14.00-25. This combination of power, hydraulic versatility, and maneuverability makes the 770A suited for precise grading tasks across varied terrain.