1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 297Get this manual
MOTOR AND PUMP REPLACEMENT IMPORTANT: The pump is not rebuildableIf pump is defective, replace as an assembly 3Remove two screws to remove pump
NOTE: Power Trim System does not have to be removed from outboard to replace pump or motor1Tilt outboard to full "UP" positionDepressurize power trim system, and loosen starboard transom bracket as outlined in "Removal and Installation" on page 6B-142Remove screws to remove motor from system