Yamaha 115-225 HP Outboards Service Manual, Page 187Get this manual
po_W_E_R_T_R_IM_A_N_D_T_IL_T_U_N_IT 3) Install the up-relief valve with new O-ring, and tighten the locking-bolt to the specified torqueFilter O-ring Up-relief valve complete
Locking bolt: 13 Nm (1.3 m.kg, 9.36 ft.lb)
4) Install the check valve complete
Check valve
5) Install the down relief-valve and the gearpump complete with new O-rings, tighten the screws, and fit the connector-shaft and filter, then fill with hydraulic fluid