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