Hydraulic trim-tilt system
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United States of America Patent
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-
Dec 25, 1984
Grant Date -
N/A
app pub date -
Dec 20, 1982
filing date -
Dec 20, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic system for trimming and tilting an outboard propulsion unit (10) includes both trim piston-cylinder units (22, 23) and a trim-tilt piston-cylinder unit (17). The flow of hydraulic fluid from the reversible pump (49) is controlled by a spool valve (26). A pressure relief valve (71) is mounted in the spool (50) to maintain pressure on one side of the spool (50) when the pump (49) is turned off to rapidly close the return valve (56) and prevent further movement of the piston-cylinder units.
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