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