A milking robot (1) for the fully automatic milking of dairy animals comprises at least one moving component (2, 9) and a cylinder (4) configured to support a movement of the component, which cylinder has a cylinder wall (11) having an aeration opening (8), as well as a cylinder rod (5) slidable into and out of the cylinder, wherein the cylinder wall surrounds at least one variable volume part (13), which volume part is free from pressure fluid connections for displacement of the cylinder rod and, furthermore, is configured to remain, via said opening, substantially in pressure equilibrium with an environment of the cylinder, wherein to the cylinder wall around said aeration opening is connected a gas collecting device (7), which has a changeable volume and which, together with the variable volume part, forms an airtight gas volume, wherein the gas collecting device has a minimum volume greater than zero. It is thus possible to keep the variable volume part at substantially ambient pressure, so that, upon ret
