Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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Repair and Service Manual
699322
CONTINUOUSLY VARIABLE TRANSMISSION (CVT)
Fig. 1 Continuously Variable Transmission System (CVT)
GENERAL
The power transmission from the engine to the rear axle
is with a continuously variable transmission (CVT). The
CVT has two matched clutch units joined by a transmis-
sion belt (Ref. Fig. 1). The engine mounted primary
clutch is a centrifugal unit that responds to engine speed
and the rear axle mounted secondary clutch is a load
sensing unit.
CLUTCHES
Primary Clutch
When the accelerator is pressed, the engine speed is
increased which causes the cams (weights) within the
centrifugal primary clutch to move outwards and force
the movable sheave inwards. The transmission belt is
engaged by the clutch sheaves and begins to rotate.
As the engine speed continues to increase, the primary
clutch sheave continues to move inwards forcing the
transmission belt to the outer diameter of the primary
clutch sheaves, which increases the speed of the belt.
The ratio is greatly decreased and supplies maximum
speed.
When the accelerator is released, the engine speed
decreases and the cams apply less pressure on the mov-
able sheave, which is forced outwards against the cams
by a compression spring. The transmission belt disen-
gages from the clutch sheave when engine speed is
decreased to the point where the cams apply less force
than the spring.
Secondary Clutch
The secondary clutch sheaves are closed at rest which
results in the transmission belt being held at the outer
diameter of the secondary clutch. The secondary clutch
has no weights but is held closed by a torsion spring
which is joined to the movable secondary assembly.
As the transmission belt starts to rotate, the secondary
clutch starts to rotate. As the speed of the primary clutch
Primary Clutch
Secondary Clutch
Transmission Belt
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