1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 311Get this manual

BIG FOOT
Shift Shaft
1Inspect shift shaft retainer for cracks and replace if necessary2Inspect shift cam face for wearReplace if worn53034

a-Shift Cam b-Shift Shaft Retainer

Reverse And Forward Gear
1Inspect gear teeth for pitting, uneven wear, scoring, etcReplace gear if any damage is found2Inspect gear clutch jawsReplace gear if jaws are rounded or chipped

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