Primary spring (1) for use in bogies of rail vehicles, comprising a support bearing (2) and a support (3) which are interconnected by means of a spring (4) Taper material elastomer, wherein the support (2) and / or the support bearing (3) is assigned a device (5) for adjusting the height of the primary spring (1), wherein the device (5) comprises a unit piston and cylinder with a cylindrical inner chamber (12), wherein the piston is hydraulically adjustable, a valve for manually filling the cylindrical inner chamber being provided.
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