A wash arm arrangement (100) for a dishwasher is disclosed. The wash arm arrangement comprises a central arm (121) adapted to be rotatably connected with a first liquid supply shaft (123) for providing pressurized liquid during operation of the dishwasher. The central arm has a first nozzle (130) arranged for outputting a jet of liquid during operation thereby providing a first reaction force Fc for rotating the central arm about its axis of rotation in a first direction. The wash arm arrangement further comprises a satellite arm (122) rotatably arranged on a second liquid supply shaft (124) arranged on an outer end of the central arm, the satellite arm having a second nozzle (131) arranged for outputting a jet of liquid during operation thereby providing a second reaction force Fs for rotating the satellite arm about its axis of rotation in a second direction being opposite to the first direction. The first and second nozzles are arranged such that the central arm is controlled to move with a periodically alternating speed due to the first and second reaction forces acting on the central arm wherein the instantaneous value of a resulting momentum Mtot for the central arm about its axis alters periodically during operation, comprising a first momentum Mc of the central arm caused by a horizontal reaction force portion Fcy of the first reaction force Fc, and a second momentum Ms of the central arm, caused by the movement of the satellite arm and comprising a momentum created by a horizontal reaction force portion Fsy of the second reaction force Fs,.