Polaris 120 XC SP - Manual (Page 76)

A--57
MAINTENANCE
Track Alignment
A periodic check should be made to see that the track is centered and
running evenly on the slide rails. Misalignment will cause excessive
wear to the track and slide rail.
When performing the following checks and adjustments, stay clear
of all moving parts to avoid serious personal injury.
Before checking track tension, make certain the track contains no
objects that could be thrown out while the track is rotating. Keep
clear of track. This includes but is not limited to hands, tools, feet
and clothing. Make certain no one is standing close to the machine
while the track is rotating.
WARNING