Continuously Variable Transmission (Cvt); Primary Clutch - Cushman HAULER 1200 Repair Manual

CONTINUOUSLY VARIABLE TRANSMISSION (CVT)

Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
CONTINUOUSLY VARIABLE TRANSMISSION (CVT)
Secondary Clutch
Transmission Belt
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.
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Primary Clutch
Fig. 1 Continuously Variable Transmission System (CVT)
Repair and Service Manual
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.
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