2006 Johnson SD 30 HP 4 Stroke Outboards Service Manual, PN 5006592, Page 242Get this manual
POWER TRIM AND TILT OPERATION
Manual Release Circuit (Manual Valve)
Turn the manual valve maximum of three full counterclockwise turnsWhen the manual valve is loosened, oil will flow unimpeded (without resistance) through the internal pump tubes, thereby facilitating manual tilting or lowering of the outboardTo hold the engine in selected position, the manual valve must be closed again