1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 306Get this manual
Remove the four large motor flange retaining screwsRemove the motor and discard the O-ring
[!] 9Remove the filter10Remove the drive coupler from the pump assemblyf1'1l 11Evenly loosen and remove the three Allen head cap screws that retain the pump assembly to the manifoldRemole the pump assembly
r=-J The pump assembly is not serviceableIf the pump assembly needs flushing, do not clean it in solventOnly clean the pump assembly in clear hydraulic fluid12Remove the two pressure port O-rings f'13l 13Remove the down relief valve assembly from the mani -