1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 21Get this manual
GENERAL INFORMATION
locking efficiency is greatly reducedFor the best safety, self-locking fasteners should be discarded and new ones installed whenever components are removed or disassembled
Washers
There are two basic types of washers: flat washers and lockwashersFlat washers are simple discs with hole to fit screw or boltLockwashers are designed to prevent fastener from working loose due to vibration, expansion and contractionFigure 21 shows several types of washersWashers are also used in the following functions: aas spacersbto prevent galling or damage to the equipment by the fastener
cto help distribute fastener load during torqumgdas sealsNote that flat washers are often used between lockwasher and fastener to provide smooth bearing surfaceThis allows the fastener to be turned easily with tool
Cotter Pins
Cotter pins (Figure 22) are used to secure special kinds of fastenersThe threaded stud must have hole in it; the nut or nut lock piece has castellations around which the cotter pin ends wrapCotter pins should not be reused after removal