Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 345Get this manual
2) Remove the socket bolts and gear pump assemblya Do not disassemble the gear pump assemblyIf it is faulty, replace it as an assembly [I] SOCKET BOLT A
3) Remove the two O-rings, valve spring, spring guide, steel ball and the down relief valve seat from the valve bodyRemove the O-ring from the down relief valve seatDiscard the O-rings, replace the O-rings with new ones during reassembly[7] VALVE SPRING