Mercury 40 Service Manual

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

Mercury 40 Specifications

General

Horsepower	40 hp
Starting System	Electric
Steering	Remote
Fuel Induction System	EFI (Electronic Fuel Injection)
Shaft Length	20"
Full Throttle RPM Range	6000