Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 304Get this manual
POWER TRIM
Hydraulic System Troubleshooting Flow Chart
TRIM SYSTEM LEAKS DOWN WITH MANUAL RELEASE VALVE CLOSED
Manual release valve and O-ring damaged
Inspect manual release valve
Manual re lease valve and 0rings appear to be O.K- Clean and reinstall manual release valve
Replace manual reo and lease valve O-rings
Trim system down
leaks Trim system does not leak downTesting complete
Trim system does not leak downTest-
ina comoleteDebris andor damage identified
Remove tilt relief valving and inspect O-rings and seals for debris andor
damaoeTilt relief valving and O-rings
appear to be O.K Clean and