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CONTINUOUSLY VARIABLE TRANSMISSION (CVT)
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Secondary Clutch
B
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
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 carbure-
tor 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.
108
Fuel Tank
Figure. 2 Removing the Transmission Belt
Transmission Belt Service
If the vehicle has been operated in a very dusty or muddy
location, the belt must be rinsed with water. If the belt
becomes frayed or badly worn, it must be replaced.
Primary Clutch Removal
Tool List
Plastic Faced Hammer.................................................1
Clutch Puller, (P/N 608429) .........................................1
Wrench, 18mm.............................................................1
Socket, 18mm ..............................................................1
Impact Socket, 19mm ..................................................1
Impact Wrench (Air or Electric) ....................................1
Ratchet.........................................................................1
Extension, 8" ................................................................1
Thread Locking Adhesive..........................................AR
Torque Wrench, ft. lbs. ................................................1
tery 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.
Remove the CVT belt (1) (Ref. Fig. 3). Remove the
Starter/Generator belt (Refer to Starter/Generator
Repair and Service Manual
Primary
Clutch
To decrease the risk of burns and
other injuries:
Disconnect the negative (-) bat-
Starter
Qty.
653045
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