1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 218Get this manual
POWER TRIM
Hydraulic Pump
Removal
1Support the outboard in trimmed up position2Loosen the hydraulic lines at the cylinder(Do not remove hydraulic lines from cylinder)
58073Cylinder hydraulic lines 3Disconnect the trim motor wires from the solenoid harness(Refer to the Remote Control and Tiller Handle Wiring Diagrams in this section 4Remove the hydraulic lines from the hydraulic pump5Remove the screws holding the hydraulic pump to the support bracketaHydraulic linesHydraulic pump screws (3)