John Deere 770 MOTOR GRADERS

Technical Description

The John Deere 770 Motor Grader is a robust, high-performance machine engineered for demanding grading tasks. It features a powerful engine delivering 176–196 hp (net) with a displacement of 7.01 L (427.8 in³), a bore of 4.1 in (105 mm), and a stroke of 5.3 in (135 mm), ensuring strong lugging ability and reliable operation. The closed-center, parallel hydraulic circuit utilizes a variable piston pump, providing up to 40.9 gal/min (155 L/min) flow and 3,503 psi pressure at 2,200 rpm for responsive blade and implement control. Transmission and clutch systems are supplied by a gear pump, while steering is metered at 159 cc/rev. The front steering offers a maximum angle of 47.5°, with frame steering at 20° left and right, and the front axle provides 18° lean and 32° oscillation for superior adaptability on uneven terrain. Ground clearance at the center is 10 in (255 mm), and the blade lifts up to 18.9 in (480 mm) with a maximum cut depth of 28.9 in (735 mm). The drawbar circle shifts up to 28.7 in right and 29.6 in left, and the moldboard side shifts 26.1 in left and 20.2 in right. The blade rotates 360°, and the rear scarifier has nine shanks with 9.8 in (250 mm) spacing, reaching a maximum depth of 11.1 in (281 mm). The electrical system includes a 12V battery and a 150-amp, 24V heavy-duty alternator. The machine operates at engine speeds of 2,000–2,200 rpm and is rated for ambient temperatures up to 122°F (50°C). Control options include hydraulic pilot valves and integration with advanced 3D systems for automated blade positioning.