Hydraulic System Troubleshooting Flow Chart - Mercury 75 Service Manual

Hydraulic System Troubleshooting Flow Chart

Manual release
valve and O-ring
damaged
Replace manual re-
lease valve and O-
rings
Trim system holds
reverse thrust:
Testing complete
Debris and/or shock
ball hang up identi-
fied
Replace piston
rod assembly
Trim system holds
reverse thrust:
Testing complete
Replace PO check
valve assembly
Trim system holds
reverse thrust:
Testing complete
90-830234R3 DECEMBER 1997
OUTBOARD WILL NOT HOLD TILTED POSITION
DURING REVERSE AND/OR TRAILS OUT
DURING HIGH SPEED DECELERATION
Inspect manual release valve
Trim will not hold
reverse thrust
Remove and inspect pis-
ton rod assembly for de-
bris and/or shock ball
hang up
Remove PO check valve
assembly,
rings and seals for dam-
age
Debris and/or dam-
age identified
Trim will not hold
reverse thrust
inspect O-
PO check valve appears
O.K. - Clean and reinstall
PO check valve assembly
Trim will not hold
reverse thrust
continued on next page
Manual release valve and
O-rings appear to be O.K.
- Clean and reinstall
manual release valve
Trim system holds
reverse thrust:
Testing complete
Shock piston appears
O.K. - Clean and reinstall
piston rod assembly
Trim system holds
reverse thrust:
Testing complete
Trim system holds
reverse thrust:
Testing complete
MID-SECTION - 5C-23