6.11
PVT System
6
Drive Belts
Belt dimensions are given in nominal dimensions. There is
a +/- variance for all critical dimensions. Clutch set up must
be inspected when a new belt is installed.
The drive belt is an important component of the converter
system
. In order to achieve maximum efficiency from the
converter, drive belt tension (deflection), clutch offset, and
alignment must be adjusted properly.
The belt cord line should be flush
with, or slightly above,
the outer circumference of the driven clutch sheaves. The
belt will seat itself in the driven clutch during the break-in
period. Adjust the belt ride out after the break-in period by
re-adjusting belt deflection.
The break-in period for a new drive belt is 30 miles. During
this time
, vary the throttle position under 50% and limit full
throttle use.
New drive belts that feature a sanded finish should be first
washed with
warm, soapy water and allowed to air dry
prior to use.
Always take time to warm up the
belt and driveline prior to
operating the snowmobile. Free track and skis from the
ground before engaging throttle.
Belt Inspection
1. Measure the belt width and replace it if it is worn
severely. Generally a belt should be replaced if the
clutches can no longer be adjusted to provide the
proper belt deflection.
• Project the side profiles and measure from corner
to c
orner.
• Place a straight edge on each side of the drive belt
a
nd measure the distance where the straight
edges intersect at the top.
2. Inspect the belt for loose cords, missing cogs, cracks,
a
brasions, thin spots or excessive wear spots.
Replace if necessary.
3. Inspect the belt for hour glassing (extreme circular
we
ar in at least one spot and on both sides of the belt).
Hour glassing occurs when the drive train does not
move and the drive clutch engages the belt.
Part
Number
Projected
Wi
dth
(IN/CM)
Overall
Side
Angle
Center
to
Ce
nter
(IN/CM)
Outer
Circumference
(IN/CM)
Ride Out Notes
3211122
1.46 / 37.1
26
°
11.5 /
29.2
46.77 / 118.8
Belt cord line
sh
ould be flush
with, or slightly
above, the outer
circumference of
driven clutch
sheaves.
MBL Kevlar Cords
Perfo
rmance replacement for the
3211080
Cut Finish
3211115
MBL High Performance / Mountain
Belt
P
BO Fiber Cords
Cut Finish
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