The T855 Commander rockwheel provides a rock-trenching solution for utility contractors. A Caterpillar 3176 engine with 335 hp powers through rock on demanding utility installations. The T-855 features increased torque rise, which allows the engine to recover quickly in situations that demand increased power. The trencher drive system uses three pumps, two radial piston motors and a heavy-duty gearbox to deliver full engine horsepower directly to the cutter wheel. Vermeer Manufacturing Co.