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