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