1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 194Get this manual
Hydraulic System Flow Chart Troubleshooting
Trim system leaks down with manual release valve closed
,release Manual valve and O-ring damaged Inspect manual release valve
Replace manual release valve and 0rings
Manual release valve and 0rings appear to be O.K- Clean and reinstall manual release valve
Trim system down
Trim system does not leak down: Testing complete
Trim system does not leak down: Testinq complete Debris andor damage identified
Remove tilt relief valving and inspect O-rings and seals for debris andor damaae
.Trim system down
Replace tilt relief valving
Tilt relief valving and O-rings appear to be O.K- Clean and reinstall tilt relief valving