2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 272Get this manual
2B-6 Power Trim and Tilt: Manual Release Circuit (Manual Valve) Turn the manual valve maximum of three full turns counterclockwiseWhen the manual release valve (1) 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 : Tilt "DOWN"Tilt "UP"