Work device

The implement (4) has a working drive movable element (2), and one energy recovery cylinder (3) for recovering energy from the movement of movable element provided with a gas-filled chamber (1). The heating of the energy recovery cylinder is performed by a heating element. A heat exchanger is directly arranged on the cylindrical shell of energy recovery cylinder, and cooling circuit and a pump for pumping cooling liquid to the energy recovery cylinder are provided for adjusting temperature of energy recovery cylinder. An independent claim is included for method for operation of implement.