Page J-1
Repair and Service Manual
B
B
CONTINUOUSLY VARIABLE TRANSMISSION (CVT)
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Fig. 1 Continuously Variable Transmission System (CVT)
GENERAL
Power transmission from the engine to the rear axle is
by means of a continuously variable transmission (CVT).
The CVT consists of two matched clutch units joined by
a drive belt (Ref. Fig. 1). The engine mounted drive
clutch is a centrifugal unit that responds to engine speed
and the rear axle mounted driven clutch is a load sens-
ing unit.
CLUTCHES
Drive Clutch
When the accelerator is depressed, the engine speed is
increased which causes the cams (weights) within the
centrifugal drive clutch to move outwards and force the
moveable sheave inwards. The drive belt is engaged by
the clutch sheaves and begins to rotate.
As the engine speed continues to rise, the drive clutch
sheave continues to move inwards forcing the drive belt
to the outer diameter of the drive clutch sheaves which
increases the speed of the belt. The ratio is greatly
decreased and provides maximum speed.
When the accelerator is released, the engine speed is
decreased and the cams exert less pressure on the
moveable sheave which is forced outwards against the
cams by a compression spring. The drive belt disen-
gages from the clutch sheave when engine speed is
reduced to the point where the cams exert less force
than the spring.
Drive Clutch
Driven Clutch
Drive Belt
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