2001 Mercury Mariner 50-60HP Factory Service Manual, Page 335Get this manual
POWER TRIM
Hydraulic System Troubleshooting Flow Chart
OUTBOARD WILL NOT HOLD TILTED POSITION DURING REVERSE ANDOR TRAILS OUT DURING HIGH SPEED DECELERATIONManual release valve and O-ring damagedInspect manual release valveManual release valve and O-rings appear to be O.KClean and reinstall manual release valve
Replace manual release valve and O-rings
Trim will not hold reverse thrust
Trim system holds reverse thrustTesting complete
Trim system holds reverse thrustTesting completeDebris andor shock ball hang up identified
Remove and inspect piston rod assembly for debris andor shock ball hang up
Shock piston appears O.K- Clean and reinstall piston rod assembly