Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 322Get this manual
MOTOR AND PUMP REPLACEMENT IMPORTANT: The pump is not rebuildableIf pump is defective, replace as an assemblyNOTE: Power Trim System does not have to be removed from outboard to replace pump or motor Motor and Electrical Testsl Repair
Trim Pump Motor Test
1Tilt outboard to full "UP" positionDepressurize power trim system, and loosen starboard transom bracket as outlined in "Removal and Installation" on pages 58-142Remove allen screws to remove motor from systemNOTE: Drive shaft is loose part and may fall out of motor when motor is removed