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