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