2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 503Get this manual

2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 503

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REAR DRIVING MECHANISM Set horizontal type dial indicator on the ring gear through the filler holeTurn the ring gear back and forth with the drive shaft to read backlash 0.05-0.25 mm (0.002-0.010 in)