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Motor just raises on its on while all switches off already took to 3 diff boat mechanics all certified. Stil same problem

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There not much here to work with. Outboard? I/O? What brand?

It sounds like a hydraulic bleed problem. The thrust of the engine is compressing the hydraulic fluid back to the reservoir. Then some valving is leaking and the fluid returns to the lift cylinders and raises them.

The strange part would be the storage of the high pressure fluid. You are suppose to need a pump for both directions. You might want to check the vent for the hydraulic reservoir. Anyway, the line pressures can be gauged.

Posted on May 15, 2010

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Posted on Jan 02, 2017

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