Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 263Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 263

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Forward Gear 1 Inspect forward gear teeth for rust, chippingexcessive wear (teeth are sharped edged), or broken teeth
needle bearingIf bearing surface is discolored (from lack of lubricant), pit