Hydraulic System Troubleshooting Flow Chart - Mercury 40 Service Manual

Hydraulic System Troubleshooting Flow Chart

Manual release
valve and O-ring
damaged.
Replace manual release
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.
90-852572R1 JANUARY 1998
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 assem-
bly.
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-21