2003+ Suzuki DF9.9/DF15 four stroke outboard motors service manual, Page 175Get this manual
8-10 LOWER UNIT
SHIFT ROD GUIDE HOUSING COMPONENTS
Inspect the "stepped" surfaces of the shift cam for excessive wear, chip or other damageReplace if necessary
Inspect the shift rod guide for excessive wear, pit, corrosion or stiffReplace if necessary Inspect the O-ring for wear, cuts, nicks or tears Inspect the boot for cracked or other damage