Track Tension - Arctic Cat ZR 120 Service Manual

3. Place the upper idler wheel assembly into position
in the tunnel; then secure with cap screws. Tighten
securely.
4. Install the skid frame (see Rear Suspension sec-
tion).
5. Place the snowmobile in the upright position.
6. Place the key on the driveshaft; then slide the
chain sprocket w/chain onto the driveshaft. Secure
with a cap screw (coated with red Loctite #271)
and washer. Tighten to 20 ft-lb.
7. Inspect the chain for proper engagement with the
clutch sprocket and the chain sprocket.
8. Inspect that the chain tensioner assembly is in
place and functioning properly.
9. Install the rear sprocket cover and secure with the
self-tapping screws. Tighten securely.

NOTE: At this point, proceed to TRACK TENSION sub-
section.

TRACK TENSION


NOTE: Track tension and track alignment are interre-
lated; therefore, always check both, even if only one
adjustment seems necessary.
Track tension is directly related to the overall perfor-
mance of the snowmobile. If the track is too loose, it may
slap against the tunnel causing wear, or it may ratchet on
the track drive sprockets. Arctic Cat recommends that the
track tension be checked once a month and adjusted
accordingly.
! WARNING
Track tension must be properly maintained. Personal
injury could result if a track is allowed to become
excessively loose.
Checking
! WARNING
DO NOT attempt to check or adjust track tension with
engine running. Turn ignition key to the OFF position.
Personal injury could result from contact with a rotat-
ing track.
1. Remove excess ice and snow buildup from the
track, track drive sprockets, and the inside of the
skid frame.
2. Place the rear of the snowmobile up on a safety
stand high enough so the track is free of the floor.
3. Without exerting any pressure on the track, mea-
sure the distance between the bottom of the wear
strip and the inside surface of the track. The mea-
surement must be within specifications. If the
measurement is not within 1/4-3/8 in., an adjust-
ment is necessary.
38
Adjusting
1. Loosen the idler wheel cap screws.
2. Loosen the rear idler wheel adjusting bolt jam nuts.

NOTE: To ensure proper track tension adjustment, per-
form all adjustments on both sides of the snowmobile.
3. If the deflection (distance between the bottom of
the wear strip and the inside of the track) exceeds
specifications, tighten the adjusting bolts to take
up excessive slack in the track.
4. If the distance between the bottom of the wear
strip and the inside surface of the track is less than
specified, loosen the adjusting bolts to increase the
slack in the track.
5. Check track alignment (see TRACK ALIGN-
MENT sub-section).
6. When proper track tension is obtained, tighten the
adjusting bolt jam nuts against the axle housings.
7. Tighten the idler wheel cap screws securely.

NOTE: Since track tension and track alignment are
interrelated, always check both even if only one adjust-
ment seems necessary.
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