Toro 38065, 38080 manual Traction Drive Systems

Chapter 3 — Traction Drive Systems

INTRODUCTION

All models use some variation of a friction drive. The engine drives a belt, which causes a drive plate(s) to rotate. As this belt is constantly tensioned, the belt and drive plate turn whenever the engine is running (Figure 67).

Figure 67 2773-014

Clutching and speed control is accomplished by moving the friction wheel. When declutched the friction wheel is not contacting the drive plate (Figure 68). When the drive is engaged, the friction wheel is moved into contact with the right side of the drive plate (Figure 69). As the friction wheel begins to turn, it drives gears, or sprockets and chains, which provide the speed reduction for the axle. Ground speed is determined by the point on the drive plate where the friction wheel makes contact. The further from center, the faster the friction wheel will turn. Moving the friction wheel to the left side of the plate changes direction of rotation (Figure 70).

1

Figure 68 2768-018

1. Gap

1

Figure 69 2773-073

1.Forward

1

Figure 70 2768-015

1.Reverse

Two Stage Snowthrower Drive Systems Manual 3 - 1