2009 Arctic Cat Prowler XT/XTX ATV Service Manual, Page 134Get this manual

2009 Arctic Cat Prowler XT/XTX ATV Service Manual, Page 134

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5 Remove the cap screw and lock nut securing the knuckle to the upper A-armDiscard the lock nut
NOTE: Never reuse lock nutOnce lock nut has been removed, it must be replaced with new lock nut