1995 Johnson 48 Special power tilt and trim. Rebuilt unit with new OMC seals and had difficult time getting info n how to bleed air from hydraulic cylinder. Add fulid to reservior, keep adding fluid while running trim up, once it is all the way up, keep running trim motor and adding fluid to fill line. Air will bleed out top as it is self purging. If its 'spongy' you have air trapped and need to bleed out for it to work properly.
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