368
TRIM AND TILT
TROUBLESHOOTING
If the outboard does not tilt as high as it should,
and the tilt motor TURNS OFF at maximum tilt
(does not sound like it is stalled at the maximum
tilt position), adjust the tilt limit switch higher and
retest. Refer to Tilt Limit Switch Adjustment on
p. 68.
Symptoms Chart
If any of these symptoms describe the unit, follow
the indicated Service Procedures, in the order
listed, to locate and correct the problem.
Service Procedures
STEP 1
Be sure the manual release valve is closed. If
NOT, torque to 45 to 55 in. lbs. (5 to 6 N·m).
STEP 2
Temporarily install a known good manual release
valve and retest. If symptoms remain, original
valve is not the problem. Reinstall original valve.
If symptoms disappear, the original valve was
faulty. Remove temporary valve and replace with
correct new valve.
STEP 3
Go to TILT/TRIM RELAY TEST on p. 145 to
determine if problem is power supply.
STEP 4
Remove trim motor and check condition of drive
coupling. If coupling is damaged, replace it.
STEP 5
Temporarily install a known good pump manifold
assembly and retest. If symptoms remain, original
assembly is not the problem. Reinstall original
assembly.
If symptoms disappear, the original pump mani-
fold assembly was faulty. Remove temporary
assembly and replace it with correct one.
STEP 6
Install replacement pump manifold assembly and
retest. If all symptoms are not corrected, recon-
sider the problem using the new symptoms.
STEP 7
Install O-ring kit. Look for any cylinder damage.
Look for chips in fluid or impact valves. Look for
other abnormal conditions. If all symptoms are not
corrected, reconsider the problem using the new
symptoms.
Pressure Leakdown Test
Before servicing a hydraulic unit, it should be
pressure tested to determine the unit's malfunc-
tion. This test must be performed with the hydrau-
lic unit removed from the outboard and mounted
in a vise or holding fixture.
Power Trim/Tilt Service Kit, P/N 434524, allows
testing of trim/tilt operation and component condi-
tion.
• The “A” adapter, P/N 336658, checks operation
of the UP circuit.
Symptom
Service
Procedures
Unit will not move in either direction. 1, 2, 3, 4, 6
Unit runs slowly in one direction,
normal speed in other direction.
1, 2, 6
Unit runs slowly. (if low hours)
(if high hours)
1, 2, 7
1, 2, 5, 7
Unit leaks DOWN and/or will not
hold trim position against thrust in
forward.
1, 2, 6
Unit leaks both UP and DOWN –
Leaks down in tilt range and/or will
not hold trim position against thrust
in forward or reverse.
1, 2, 7
Unit will not trim/tilt one way, but
works the other way. Unit will not run
DOWN, but runs UP; or it runs
DOWN, but will not run UP.
2, 3, 6
To Next Page
Loading...
Need help?
General
