Hydraulic System Troubleshooting Flow Chart - Mercury 40 Service Manual

Hydraulic System Troubleshooting Flow Chart

Manual release
valve and O-ring
damaged.
Replace manual
lease valve and O-rings.
Trim system holds re-
verse thrust. Testing
complete.
Debris and/or shock
ball hang up identi-
fied.
Replace piston
rod assembly.
Trim system holds re-
verse thrust. Testing
complete.
Replace PO check
valve assembly.
Trim system holds re-
verse thrust. Testing
complete.
90-828631R3 MARCH 1999
OUTBOARD WILL NOT HOLD TILTED
POSITION DURING REVERSE AND/OR
TRAILS OUT DURING HIGH SPEED
DECELERATION.
Inspect manual release valve.
Trim will not hold
re-
reverse thrust.
Remove and inspect pis-
ton rod assembly for de-
bris and/or shock ball
hang up.
Remove PO check valve
assembly, inspect O-rings
and seals for damage.
Debris and/or dam-
age identified.
Trim will not hold
reverse thrust.
PO check valve appears
O.K. - Clean and reinstall
PO check valve assem-
bly.
Trim will not hold
reverse thrust.
continued on next page
POWER TRIM
Manual release valve and
O-rings appear to be O.K. -
Clean and reinstall manual
release valve.
Trim system holds re-
verse thrust. Testing
complete.
Shock piston appears
O.K. - Clean and reinstall
piston rod assembly.
Trim system holds re-
verse thrust. Testing
complete.
Trim system holds
reverse thrust. Test-
ing complete.
Page 5C-23