The Cat D7R is a robust and simple to use machine
US Manufacturer Caterpillar is to release its latest model in its stripped down Middle East-friendly R-series.
The Cat D7R track-type tractor packs a Cat C9 ACERT engine, with a net power rating of 174 kW (240 hp) at rated engine speed, meets standards in accord with China Stage II (GB 20891-2007), EPA Tier 2 and EU Stage II emissions regulations.
Caterpillar says the D7R features a massive mainframe, heavy-duty undercarriage, robust powershift transmission, differential steering, pilot-controlled hydraulics and efficient operator station.
The powerful-looking machine drips durability and Cat claims that low life time operating costs through ability to rebuild components and overall machine efficiency.
While it may lack the sophistications of its Western cousins, Caterpillar has equipped the machine with the field-proven Cat ADEM 4 (Advanced Digital Engine Management) electronic control module to optimize engine performance and fuel economy. Controlled multiple fuel injections during the combustion cycle provide consistent power in all operating situations.
The durable, and unique, torque divider sends 70 percent of engine power through a torque converter and 30 percent through a direct-drive shaft, ensuring maximum drive train efficiency and the torque multiplication to move heavy loads.
The torque divider was initially introduced in the late 1950’s by Caterpillar and has demonstrated a field proven durable and reliable connection between the engine and the transmission. The planetary powershift transmission features 3 speeds forward and reverse with heavy-duty, large-diameter, high-capacity oil-cooled discs for maximum performance and long-life durability. The differential steering system provides the operator with an intuitive single tiller bar control for all directional and speed selections.
The implement hydraulics feature a pilot control and load-sensing system with a variable displacement pump, providing efficiency and fuel economy by operating at the precise level required to get the work done. Pilot-hydraulic controls provide fast implement response with low lever efforts that provide high controllability of implements and lower fatigue levels for the operator.
The D7R final drives are elevated, raising the track-drive sprockets out of the dirt. This isolates the final drives from ground shock loads, which are then dissipated in the massive mainframe. The heavy-duty undercarriage, available in three configurations to match specific operating situations, features sealed and lubricated track chains, a robust tubular roller frame to resist twisting and bending forces, life-time lubricated track rollers and idlers that greatly extend undercarriage life and deliver lower operating costs.
The D7R Specifications
Std. Operating Weight 24 962 kg
Net Power Rating 179 kW
SU Blade Capacity 6.86 m³