Hydraulic mechanism, on, off: Listen & Download Hydraulic mechanism, on, off .mp3 Error! Change your browser, please! ⇓ Download Off, Hydraulic mechanism, on ⚠ Hand winch ⚠ Foot pump inflating a mattress ⚠ Drawbridge, lower chains ⚠ Kick the bike speed switch ⚠ Bicycle hand pump ⚠ Mechanical sounds ⚠ Drawbridge raise chains ⚠ Chain hoist, Chain ⚠ Small hydraulic gear ⚠ ★★★★★