Yamaha F100B F100C Outboards Factory Service Manual, Page 291Get this manual
Gear pump (F100C) Checking the gear pump
1Check the gear pump for damageReplace if necessary
3Check main valves and for dirt or residueClean if necessary4Check the manual valve seat and relief valve seat for dirt or residueClean if necessary
S60C7835
Assembling the gear pump
1Install the shuttle piston and main valves 2, and then tighten the valves to the specified torque2Install the relief valve seat 3, valve seats 4, and main valve 5, and then tighten the valve to the specified torque