Driven Clutch
Principles of Operation (Fig. 5)
The operation of the driven clutch is affected by load.
When the vehicle is stopped, the drive belt is held at the
outer diameter of the driven clutch sheaves from the
pressure of the spring pushing the moveable sheave
against the fixed sheave and away from the fixed cam.
Three sets of buttons on the moveable sheave provide
a low friction surface on which the sheave can slide on
the ramp of the fixed cam.
1
2
Once the drive clutch (engine mounted) starts rotating,
the drive belt also starts to rotate. With increasing speed
of the drive clutch, the belt begins to climb to the outer
diameter of the drive clutch sheaves. This increases the
tension on the drive belt, and forces the driven clutch
moveable sheave to move away from the fixed sheave
against the pressure of the spring. As the belt tightens
and the driven clutch sheaves open up, the drive belt
rides lower in the driven clutch sheaves.
3
4
Figure 5
3.
4.
1.
2.
Moveable sheave
Drive belt
Button
Ramp (fixed sheave)
With increased load from the transaxle and/or spray
pump, the cam resists forward movement relative to the
moveable sheave and drive belt. Torque from the drive
belt and spring pressure moves the movable sheave up
the ramp of the fixed cam. The drive belt becomes posi-
tioned closer to the outer diameter of the driven clutch
sheaves to respond to the load increase.
Multi Pro 1200/1250
Page 7 – 5
Drive Train
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