1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 164Get this manual
SUSPENSION General (Rear Idler Wheel)
The rear idler wheels in conjunction with the track tension adjusting bolts provide proper track tension and alignmentThe tension and alignment may be incorrect if the rear wheels are damaged or wornShould this be the case, it may be necessary to replace the rear idler wheels
Rear Idler Wheel Installation
1Install new rear idler wheel to the rear axle and secure in place with flat washer and boltNOTE: When installing new wheel to the rear axle, it may be necessary to pull the track rearward to allow sufficient clearance for rear wheel installation
Rear Idler Wheel Removal