1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 228Get this manual
Forward Gear 1Inspect forward gear teeth for rust, chipping, excessive wear (teeth are sharped edged)or broken teethInspect forward gear clutch jaws for wearRounded jaws indicate the followingImproper sh ift cable adjustmentEngine idle speed too highShifting too slowly
52873Mandrel (14mm socket)Bearing
Use Driver 91-826872 to press new needle bearing into forward gearPress on NUMBERED side of bearing
Inspect propeller shaft forward gear bearing surface to determine condition of forward gear needle bearing If bearing surface is discolored (from lack of lubricant)pitted or worn, propeller shaft and bearing should be replaced