13
The drive pulley comprises a fixed cone 1 with the shaft 12; a
movable cone 3 with governor weights 2 rotating on the axes;
stop block 4 with rollers 9, on which the governor weights are
moved; a cover 5 and a spring 6 installed between the stop block
and the cover. The fixed cone and stop block are connected to
the shaft with the right hand thread. The fixed cone of the pulley
is put on the crankshaft and fastened with the bolt and washer.
It is necessary to fix the bolt with the anaerobic thread-locking
adhesive. Be sure to use the key bolt. The spring provides the
idling of the cvt as it spreads pulley cones with a decrease in the
engine rotational rate or stoppage. In the idling mode, between
the belt and the conical surface of the movable cone there should
be a gap of 1 to 3 mm, which is regulated by the rings 13 to be
installed between the stop block and the shaft projection.
The drive pulley operates as follows, when the adjuster is rotated,
the centrifugal force influencing the governor weights tend to
rotate them so as to move the movable cone from the stop block
and compress the belt in the pulley groove. The centrifugal
forces are counteracted by the return spring, the action of which
is overcome by the governor weights ranging from 2200 rpm.
A further increase in the engine rotational rate results in the
seizure by the cones of the belt and increase in its compression
and tension forces from zero to the working value sufficient for
torque transmission and overcoming the motion resistance force
of SNOWDOG�
8.2.2
Adjustment, disassembly and assembly of the
cvt pulleys
1�
Check the distance B between the edges of the cones
15 and 14 of the driven pulley. It should be equal to the
belt width of ±0.5 mm (see Figure). The correctness
of the adjustment can be checked by putting the belt
in the groove of the driven pulley, the belt should not
protrude over the groove by more than 2 mm. If the
belt protrudes over the groove by more than 2 mm,
then unscrew the bolt 17 and remove the fixed driven
cone with the puller, remove from the shaft the key
bolt 18, and then install on the shaft one or two rings
16. Assemble in the reverse sequence. Installing one
ring reduces the belt protrusion over the groove by
2 mm�
2�
Check the distance A between the ends of the
fixed cones of pulleys, it should be 55±0.5 mm. If
necessary, adjust the distance by moving the engine
in the slots of the engine sub-base.
3�
Install the belt on the cvt, engage the neutral speed
(if available) or remove the chain. Then rotate the
driven pulley repeatedly for the belt to get to the
outer diameter of the pulley. Check the belt tension.
8.2.3 Maintenance at the end of the operation season
Lubricate the shaft under the split bushing and the bushing of
governor weight axes. For lubrication, use the grease of the
standard NLGI-2.
At the end of each season or every 100 engine hours (whichever
comes first) check the status of bushes on the axes of governor
weights and the condition of liners. The wear of the bushes of
governor weights can be evaluated by the value of the radial
backlash of governor weights. The allowable backlash magnitude
is not more than 1 mm. The wear of the inserts can be assessed
by the magnitude of the gap between inserts and guide ribs the
movable cone. The amount of the allowable gap is not more than
1�5 mm�
!
WARNING
IF THERE IS ANY RUBBER RESIDUE ON THE SHAFT
OF THE ADJUSTER, REMOVE THE RESIDUE WITH
SOME CLOTH SOAKED IN GASOLINE.
!
WARNING
PREVENT PASSAGE OF GREASE ON THE CONICAL
SURFACES OF DISCS.
!
WARNING
PREVENT PASSAGE OF GASOLINE OR GREASE ON
THE CVT BELT.
Permissible belt wear is not more than 3 mm, if the wear exceeds
the value, it is necessary to replace the belt.
