B
108
Repair and Service 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.
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increases and the belt starts to climb the sheaves, the
secondary clutch responds by being forced open in order
to permit the belt to ride lower in the secondary clutch
sheaves. The sheaves overcome the pressure applied by
the torsion spring and cam.
As the secondary clutch slows, the belt rides lower in the
primary clutch sheaves. The secondary clutch compen-
sates by closing in response to the torsion spring and
cam.
Increased Load
When a vehicle traveling at governed speed begins to
climb a grade or is subjected to other increased load con-
ditions, a change in wheel speed is detected by the clutch
system and the transmission belt seeks a position where
it can achieve adequate friction to overcome the load
change.
The belt moves outwards on the secondary clutch which
closes due to the torsion spring that moves the movable
sheave against the torque ramps. The movement of the
transmission belt overcomes some of the centrifugal force
applied by the cams in the primary clutch.
This forces the belt lower into the primary clutch which
increases the drive ratio. This down-shifting applies more
torque to the rear axle without an appreciable change to
the engine speed since the governor opens the throttle in
direct the response to the decrease in ground speed.
Equilibrium
The CVT functions because the primary and secondary
clutches maintain equilibrium. The clutch sets are
adjusted to the vehicle that they are designed to operate.
Changes in vehicle weight or desired performance char-
acteristics require that both clutches be adjusted to the
needs of the vehicle and stay compatible with each other.
Removing the Transmission Belt
With the vehicle on level ground, remove the transmission
belt by pulling the belt to the top which will cause the sec-
ondary clutch sheaves to open and loosen the belt ten-
sion (Ref. Figure. 2).
The belt can be moved off to the secondary clutch.
Figure. 2 Removing the Transmission Belt
Transmission Belt Service
The transmission belt will require no service unless the
vehicle has been operated in an very dusty or muddy
location in which case it must be washed with plain water.
If the belt becomes frayed or badly worn, it must be
replaced.
Primary Clutch Removal
Tool List
Qty.
Plastic Faced Hammer.................................................1
Clutch Puller, (P/N 608429) .........................................1
Wrench, 18 mm............................................................1
Socket, 18 mm .............................................................1
Impact Socket, 19 mm .................................................1
Impact Wrench (Air or Electric) ....................................1
Ratchet.........................................................................1
Extension, 8” ................................................................1
Thread Locking Adhesive..........................................AR
Torque Wrench, ft. lbs. ................................................1
To decrease the risk of burns and
other injuries:
Disconnect the negative (-) battery cable to keep the
engine from accidentally starting before removing
the transmission belt.
Make sure that the engine and exhaust components
have become cool before you work on the vehicle.
Do not allow the fingers to become trapped between
the belt and clutch sheave.
Use only sockets designed for use with an impact
wrench. Never use a socket intended for use with
hand tools.
Fuel Tank
Primary
Clutch
Starter
