Mercury 90 Service Manual

90-830234R3 DECEMBER 1997 MID-SECTION - 5C-25
Hydraulic System Troubleshooting Flow Chart
TRIM SYSTEM LEAKS DOWN WITH
MANUAL RELEASE VALVE CLOSED
Inspect manual release valve
Manual release
valve and O-ring
damaged
Replace manual re-
lease valve and O-
rings
Trim system does
not leak down:
Testing complete
Trim system leaks
down
Manual release valve and O-
rings appear to be O.K. - Clean
and reinstall manual release
valve
Trim system does
not leak down:
Testing complete
Remove tilt relief valving
and inspect O-rings and
seals for debris and/or
damage
Debris and/or dam-
age identified
Replace tilt relief valving
Trim system does
not leak down:
Testing complete
Trim system leaks
down
Tilt relief valving and O-rings
appear to be O.K. - Clean and
reinstall tilt relief valving
Trim system does
not leak down:
Testing complete
Remove PO check valve
assembly, inspect O-
rings and seals for dam-
age
Debris and/or dam-
age identified
Replace PO check
valve assembly
PO check valve appears
O.K. - Clean and reinstall
PO check valve assembly
continued on next page
Trim system leaks
down
Trim system does
not leak down:
Testing complete
Trim system does
not leak down:
Testing complete

Mercury 90 Specifications

General

Brand	Mercury
Model	90
Category	Outboard Motor
Language	English