Arctic Cat Sno Pro 120 Service Manual page 406

 NOTE: To aid in centering the front arm with the
hole in the tunnel, position the skid frame and track
at a 45° angle to the bottom of the tunnel.
4. Install the rear of the skid frame and the track into
position in the tunnel.
5. Align the rear arm assembly with the appropriate
hole in the tunnel. Secure the rear arm assembly with
a cap screw. TIGHTEN ONLY UNTIL SNUG.
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6. Tip the snowmobile onto the other side; then align
the rear arm assembly with the appropriate hole in
the tunnel. Secure the offset arm assembly with a cap
screw, lock washer, and flat washer. TIGHTEN
ONLY UNTIL SNUG.
 NOTE: Do not install the short legs of the rear
springs onto the adjusting cams at this time.
7. At this time, place the snowmobile to the upright
position; then tighten both rear arm mounting cap
screws to 40 ft-lb.
 NOTE: At this point, tighten all remaining skid
frame mounting hardware to 40 ft-lb.
8. Using the Rear Suspension Spring Tool, install the
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short legs of the rear springs onto the adjusting cams
making sure the cams are in the same adjustment
positions.
9. Adjust track tension deflection and alignment (see
Track Tension and Track Alignment in Section 6).
After proper track tension and alignment have been
attained, make certain that the rear axle cap screws are
tightened to 20 ft-lb or component damage will occur.
CAUTION