341
TRIM AND TILT
TROUBLESHOOTING
14
If the outboa rd does not tilt as hig h as it should,
and the tilt mot or TURNS OF F at maximum tilt
(does not sound like it is st alled at the maximum
tilt position), adjust the tilt limit switch higher a nd
retest. Refer to Tilt Limit Switch Adju stment on
p. 28.
Symptoms Chart
If any of these symptoms describe the unit, follow
the ind icated Service Proce dures, in the o rder
listed, to locate and correct the problem.
Service Procedures
STEP 1
Be sure the manu al relea se valve is clo sed. If
NOT, torque to 45 to 55 in. lbs. (5.1 to 6.2 N·m).
STEP 2
Temporarily install a known good manual release
valve and r etest. If sympt oms rema in, origin al
valve is not the problem. Reinstall original valve.
If symptoms disap pear, t he origina l va lve wa s
faulty. Remove temp orary valve and replace with
correct new valve.
STEP 3
Go to TILT/TRIM RELA Y TEST on p. 105 to
determine if problem is power supply.
STEP 4
Remove trim mo tor a nd c heck condition of drive
coupling. If coupling is damaged, replace it.
STEP 5
Temporarily inst all a known go od pump ma nifold
assembly and retest. If symptoms remain, original
assembly is n ot the prob lem. Rein stall origina l
assembly.
If symptoms d isappear, the o riginal p ump 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 symp toms are not corrected, reco n-
sider the problem using the new symptoms.
STEP 7
Install O-ring kit. Loo k for any cylinder damage.
Look for chip s in fluid or imp act valves. L ook for
other abnormal conditions. If all symptoms are not
corrected, reconsider th e problem using the new
symptoms.
Pressure Leakdown Test
Before servicin g a hydraulic unit, it should b e
pressure te sted to de termine the unit's malfunc-
tion. This test must be performed with the hydrau-
lic unit remo ved from the outboard and mounted
in a vise or holding fixture.
Power T rim/Tilt Service Kit, P/N 434524, allo ws
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
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