The radio remote D-50 uses the latest hydrostatic drive technology for low maintenance and high reliability. Bearings and seals are not altered; most can be found locally. Tracks are 24-inch wide heavily reinforced rubber, and 16-inch ground clearance eases travel in mud, snow and sand. It uses two-speed motors, which enable the rig to negotiate a 75-percent grade (with the 115-horsepower engine) in low range and travel at 5 mph in high range. Visit www.diedrichdrill.com.