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