MID-SECTION - 5D-590-817643R1 DECEMBER 1996
Hydraulic System Troubleshooting
Support outboard with tilt lock lever when servicing
power trim system.
After debris or failed components have been
found (during troubleshooting procedures) dis-
assemble unit completely and replace all O-rings.
Check ball valve components and castings must
be cleaned using engine cleaner and com-
pressed air or replaced prior to reassembly.
Power trim system is pressurized. Outboard must
be in the full ‘‘UP” position (cylinder fully ex-
tended) prior to fill screw or manual release valve
removal.
Refer to instructions following if disassembly is re-
quired.
Follow preliminary checks before proceeding to trou-
bleshooting flow diagrams (following).
Preliminary Checks
Operate Power Trim System after each check to
see if problem is corrected. If not, proceed with
the next check.
1. Check that manual release valve is tightened to
full right (clockwise) position.
2. Check trim pump fluid level with outboard in full
“UP” position and fill if necessary. Refer to “Fill
and Purge the Power Trim System.”
3. Check for external leaks in Power Trim system.
Replace defective part(s) if leak is found.
4. Outboard not holding tilted position (falls to trim in
position) indicates debris or defective compo-
nents in trim valve assembly. Clean or replace
components as required.
5. Check manual release valve for broken stem and
one O-ring remaining in the release valve pas-
sage. (Separate the manifold assembly from the
cylinder to dislodge broken stem.) Install new re-
lease valve and test system.
6. Check for nicked, deteriorated, or misplaced
O-rings throughout trim system.
Leak Down Check - Pump and
Manifold Assembly
NOTE: Scribe (d) pump housing and manifold before
disassembly.
1. Debris or chips between valve and seat (a), usu-
ally imbedded in rubber valve seat.
2. Nicked or deteriorated O-ring (b).
3. Nicked, deteriorated, or misplaced O-ring (c).
a
b
c
d
51560
4. After reassembly, insert driveshaft and check
pump rotor resistance to turning - housing halves
can shift/turn during reassembly. Align scribe
marks (d) carefully.
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