Crawler Tractor Ups Production, Lowers Emissions

Liebherr’s 50-metric ton (mt) PR 766 crawler tractor was designed for power, low emissions, efficiency, driver comfort and durability, the company reported. With operating weights of between 46,200 kilograms (kg) and 54,200 kg, the tractor is the successor model to the PR 764. It is powered by a 310-kilowatt (kW) (422-horsepower) 8-cylinder V-engine that provides a drawbar pull, or pushing force, of 694 kilo newtons (156,017 pounds). The diesel unit in the PR 766 complies with Stage IV/Tier 4 emission standards, Liebherr reported. An optimized combustion process minimizes the particles while they are still inside the engine. The exhaust gas after treatment concept uses selective catalytic reduction. As a result, the new Liebherr diesel engines surpass Stage IV/Tier 4 emission standards without the use of a diesel particulate filter.
The unit always runs at the optimum efficient speed, Liebherr reported. Due to its hydrostatic drive, the speed of the diesel engine can be kept constant regardless of the required load. Essential drive train components are developed in-house and optimally coordinated, which increases the efficiency of the system. Also, the PR 766 is equipped with the “ECO function.” This gives the driver the opportunity to choose between high performance and maximum efficiency. The rig features proactive power adjustment. This involves both internal engine and external machine parameters being recorded, such as the deflection of the drive joystick; and the engine power is automatically increased periodically based on the current demand.
The spacious cab is designed for maximum comfort, the company reported. It is identical to the driver’s platform in the 70-mt PR 776 crawler tractor, launched in 2016. With Liebherr’s successful single- lever operation, the driver can control all driving and steering movements with just one joystick. Special features in the cab include the centralized control elements and the touch-controlled color display, as well as many storage areas and a climate-controlled storage compartment.
Maintenance is simplified via wide opening access flaps and engine compartment doors, Liebherr reported. The rig’s high-quality and particularly reliable hydraulic pumps and hydraulic motors operate with virtually no wear, it reported. The intervals for changing the hydraulic oil on the new PR 766 can be extended to up to 8000 operating hours.
The LiDAT fleet management system, which comes standard, provides comprehensive machine data via state-of-the-art communication technology, Liebherr reported. This improves efficiency by enabling optimized operational planning and reliable remote monitoring. Data is updated several times a day and can be called up at any time using a web browser. An automatic alarm can be set for important information, for example if the machine leaves a predefined zone or if a critical operating situation arises.
http://www.liebherr.com