Abstract: A belt drive system comprising a drive sheave, a driven sheave, a belt providing driving engagement between said sheaves and a clutch for engaging and disengaging said driving engagement. The clutch is engaged and disengaged by moving an idler pulley assembly toward and away from the belt and by moving the driven sheave away from and toward the drive sheave. The clutch further includes an actuator member for providing simultaneous coordinated movement of the idler pulley assembly and driven sheave for engagement and disengagement of the clutch.

Abstract: A self-propelled windrower has a traction unit that includes a generally horizontal subframe in the form of a regular trapezoid, the subframe including transverse front and rear beams and a pair of rearwardly converging side beams connecting the opposite ends of the front and rear beams. The rear beam has a central fore and aft pivot, which carries an oscillating rear axle structure that includes a pair of caster wheels at opposite ends of the axle structure. A pair of drive wheel support housings extend downwardly and forwardly from the opposite ends of the front beam, each housing including a vertical plate that forms the outer housing side wall, the upper end of the plate abutting and being welded to the end of the front beam and also overlapping and being welded to the outer side of the forward end of the side beam. The inner vertical wall of the housing is welded to the under side of the beam a short distance from the end of the beam.