1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 238Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 238

GEAR HOUSING
FORWARD GEAR
1Inspect forward gear teeth for breakage, rust, chipping and excessive wear2Inspect forward gear clutch jaws for wearRounded jaws indicate the following: aImproper shift cable adjustmentbEngine idle speed too highcShifting too slowly

aGear teethClutch teeth 3Inspect propeller shaft FORWARD gear bushing surface to determine condition of bushingIf surface is discolored from lack of lubricant, pitted or worn, propeller shaft and bushing should be replaced

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