Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 222Get this manual
Power Trim Assembly Removal and Installation Removal
1Remove harness retainer, sta-straps and sheet from remote control harnessLoosen clamp and disconnect remote control harness from outboard harness
2Raise engine to the full "Up" position and engage tilt lock lever
AWARNING
Failure to support engine as shown could result in personal injury andor damage to engine or boat
Support engine as shown in either photo, to prevent engine from tipping (forward toward engine well of boat or downward toward boat transom) when retaining pin is removed in STEP 6