2005 Kawasaki Brute Force 750 4x4i, KVF 750 4x4 ATV Service Manual, Page 324Get this manual
12-74 FINAL DRIVE Bearing and Oil Seal
Oil Seal Inspection
seals Inspect the oil the lips[A]misshapen, discolored (indicatReplace any if are ing that the rubber has deteriorated), hardened, or been otherwise damaged.