1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 143Get this manual
TRANSMISSION (SALSBURY 770)Inspect the spring for fatigue or damageReplace as necessaryExamine the nylon bushings for wear and deteriorationReplace if condition is doubtfulInspect all threaded parts for stripped threads or otherwise damaged threadsReplace damaged componentsInspect the snap ringcondition is doubtfulInspect the cup washercondition is doubtfulReplace if damaged or if Install the two (2) springs on the roller arm pinNOTE: The longer end of each spring must be positioned adjacent to the holes in the roller arm810
Replace if damaged or if