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