TROUBLESHOOTING SERVICE MANUAL NUMBER 28
Page 1C-18 90-863160 MAY 2000
Oil Foams Out Of Pump Fill/Vent Screw
Cause Special Instructions
Contaminated oil.
Flush system with clean oil refill pump
and bleed trim system.
Oil level low.
Check for cause of low oil level and
correct. Add oil to pump and bleed
system.
Sterndrive Unit Cannot Be Lowered From UP Position Or Lowers With Jerky
Movements
Cause Special Instructions
Air in trim system.
Check for cause of entry. Fill and
bleed trim system.
Low oil level. Add oil.
Insufficient IN/DOWN pressure or
shuttle valve stuck.
Test. If shuttle 1 is stuck, replace
pump adaptor. (Refer to SECTION 5A) If
pressure is low, replace adaptor or
attempt to repair by replacing the
following items:
D IN/DOWN pressure relief valve 1
Trim cylinder(s) binding.
Check for cause of binding. Repair or
replace as necessary.
Gimbal housing-to-trim pump hydraulic
hose pinched.
Replace hose 8.
Hoses reversed on one trim cylinder
only.
Reconnect hoses correctly.
Drive unit binding in gimbal ring.
Check for cause of binding and
replace.
Down pressure relief valve (6) has dirt
particles under check ball.
Replace with a new valve kit.
Sterndrive Unit Will Not Stay In Full UP Position For Extended Periods
Cause Special Instructions
External leakage.
Check for cause and correct. Add oil to
pump and bleed trim system.
Pump OUT/UP circuit leaking
internally.
Test. (Refer to SECTION 5A) Replace
adaptor 2 or attempt to repair by
replacing the following:
D Thermal relief valve 4
D Poppet valve seals 9
Trim cylinder(s) leaking internally and
pump DOWN circuit leaking internally
(both must be faulty to cause this
problem).
Rebuild cylinders 5 Repair or
replace adaptor 2 as required.
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