Mercury 50

POWER TRIM
90-828631R3 MARCH 1999 Page 5B-25
Hydraulic System Troubleshooting Flow Chart
OUTBOARD WILL NOT HOLD TILTED POSITION
DURING REVERSE AND/OR TRAILS OUT
DURING HIGH SPEED DECELERATION
Inspect manual release valve
Manual release
valve and O-ring
damaged
Manual release valve and
O-rings appear to be O.K.
Clean and reinstall manu-
al release valve
Trim system holds
reverse thrust:
Testing complete
Trim will not hold
reverse thrust
Replace manual release
valve and O-rings
Trim system holds
reverse thrust:
Testing complete
Remove and inspect pis-
ton rod assembly for de-
bris and/or shock ball
hang up
Shock piston appears
O.K. - Clean and reinstall
piston rod assembly
Trim system holds
reverse thrust:
Testing complete
Debris and/or shock
ball hang up identified
Replace piston
rod assembly
Trim system holds
reverse thrust:
Testing complete
Trim will not hold
reverse thrust
Remove PO check valve
assembly, inspect O-
rings and seals for dam-
age
Debris and/or dam-
age identified
PO check valve appears
O.K. - Clean and reinstall
PO check valve assembly
Replace PO check
valve assembly
Trim system holds
reverse thrust:
Testing complete
Trim will not hold
reverse thrust
Trim system holds
reverse thrust:
Testing complete
continued on next page