These units incorporate precision gearing (in single, double, triple, quadruple, and quintuple reductions) enclosed in heavy-duty cast iron or fabricated steel housings. Type TDS standard features include through hardened single helical gears, tapered roller bearings, large inspection plates, a positive splash system for lubrication, extra wide bearing spans and center bearing supports; all to provide a rugged, reliable unit with proven dependability in virtually every application. All Type TDS units can be assembled with a variety of horizontal input and output shaft arrangements extending on either side of the speed reducer. Hollow output shafts are also available.