Abstract: The present invention is directed to a portable hose cutoff saw having an improved stable base structure comprising a front plate and a back plate, a top plate extending transversely between the front and back plates interconnecting said front and back plates, and at least one connecting member extending transversely between a bottom portion of the front and back plates. The present invention also provides for a portable hose cutoff saw having a plurality of slideably adjustable hose biasing pins that may be adjusted to optimally bias the hose at or about a portion of a hose to be cut by the saw, thereby resulting in a consistent and straight cut of the hose.

Abstract: The invention is an improved belt drive system of the type having an automatic belt tensioner, an automatic belt tensioner pulley, a crankshaft pulley, an accessory pulley, and a power transmission belt trained about the automatic belt tensioner pulley, the crankshaft pulley, and the accessory pulley. It is improved by the inclusion of an initial tensioner.