2009 Arctic Cat 150 ATV Service Manual, Page 36Get this manual
2Inspect the O-rings on the movable face for nicks, tears, or swelling KM379
3Inspect two grease seals in the movable face for nicks, cuts, or damageKM382B
5Measure the driven face spring free lengthIf the free length is less than 83.20 mm, the spring must be replacedKM380B