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