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