Harvesters are industrial forestry processing tractors that fell trees, de-limb them and make them into logs via crosscuts. Though the company no longer exists -- it is now a subsidiary company of John Deere -- Timberjack previously produced numerous harvester models, each with its own varying specifications. At the time of its production, Timberjack's 1270D model harvester served as the company's standard model, working in over 1,600 forestry systems at the peak of its popularity.
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A John Deere 6081H high-torque diesel engine powers the Timberjack 1270D harvester. This six-cylinder engine outputs 215 horsepower at 1,400 to 2,000 rotations per minute. It has a displacement of 494 cubic inches. The air-cooled, turbocharged 6081H features a High Pressure Common Rail (HPCR) fuel system with air-to-air aspiration and John Deere Electronic Control, which provides variable injection pressure and timing. A hydrostatic mechanical transmission with a protected electric-hydraulic range shift and two-speed gearbox shifts through the 1270D's gears. This harvester can reach speeds of up to 15.5 miles per hour. Hydraulically activated oil-immersed disc brakes provide stopping power while an articulated frame steering with two hydraulic cylinders allows operators to control the machine.
Timberjack's 1270D harvester features a 32.8-foot long telescopic boom with a cutting capacity of 25.6 inches. Its load-sensing, flow-controlled hydraulic system features two rubber feed rollers and has a rated flow of 80 U.S. gallons per minute and a pressure of 1842 Kilogram per square inch. It features a gross lifting torque of 131,285 pound-feet and a gross swing torque of 32,160 pound-feet. A PC-based Timbermatic 300 centralised digital control system coupled with a proportional, electrical mini-joystick allows users to control the hydraulic system via semi-automatic or manual settings.
The Timberjack 1270D harvester measures 24 feet long and 9 feet wide when equipped with its six standard tires. It has a ground clearance of 24.6 inches, a 12-foot 1-inch wheelbase and a standard reach of 30 feet, 6 inches. High-walker axles and balanced gear bogeys make for a high and wide ground clearance. The operator sits in a levelling and rotating cab with a 15-degree tilt option. Tinted polycarbonate windows with washers and wipers protect the cab, 2,240-watt work lamps allow the 1270D to operate at night and hydraulically actuated steps help operators enter the vehicle.
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