1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 288Get this manual
REAR DRIVING MECHANISM BACKLASH INSPECTION
Remove the oil filler cap Install the pinion holder onto the pinion joint with four 10 mm nutsSet the holder in viseTOOL: Pinion holder 07924-HA00001 or 07924- HAOOOOO (Modified-Increase (4) holes to 10.5 mm)
(1) PINION HOLDER
Set horizontal type dial indicator on the ring gear, through the oil filler hole Rotate the ring gear by hand until gear slack is taken upTurn the ring gear back and forth to read backlash STANDARD: 0.08-0.18 mm (0.003-0.007 in) SERVICE LIMIT: 0.25 mm (0.010 in) Remove the dial indicatorTurn the ring gear and measure backlashRepeat this procedure once moreCompare the difference of the three measurements DIFFERENCE OF MEASUREMENT SERVICE LIMIT: 0.10 mm (0.004 in) If the difference in measurements exceeds the limit, it indicates that either the bearing is not installed squarely, or the case is deformedInspect the each bearing and caseIf backlash is too small, replace the ring gear left side spacer with thicker oneBacklash is changed by about 0.06 mm (0.002 in) when thickness of the spacer is changed by 0.12 mm (0.005 in)RING GEAR SPACERS: Twenty-five spacers (from to and to T) are available in thickness intervals of .06 mm Standard: 1.50 mm (0.059 in) Thinnest: 0.96 mm (0 .038 in) Thickest: 2.40 mm (0.094 in) Change the right side spacer thickness an opposite amount to what the left side spacer was changed if the left spacer was replaced with 0.10 mm (0.004 in) thicker spacer, replace the right spacer with one that is 0.10 mm (0.004 in) thinner