Combined pump housing for several rated quantities

A hydrostatic piston engine comprising:

• a drive unit having a rated quantity;
• a swash plate;
• a housing configured to accommodate the drive unit, the housing comprising a top end defining a top opening through which the drive unit is received in the housing, the housing further comprising a bottom end opposite to the top end;
• and
• a lid-shaped bearing flange releasably attached to the top end of the housing for closing the top opening of the housing, the lid-shaped bearing flange having an inner surface on which a bearing shell is provided, the swash plate being arranged on the bearing shell, such that the swash plate can be assembled from the top opening of the housing;
• a driving shaft rotatably mounted in the housing, the driving shaft being connected fixedly in terms of rotation to the drive unit and penetrating the housing in a through-hole in a manner which is outwardly sealed,
• wherein the drive unit is formed by a cylinder drum connected fixedly in terms of rotation to the driving shaft, the cylinder drum comprising a piston bore in which a piston is mounted for reciprocal movement, the piston being axially supported on the swash plate,
• wherein an auxiliary pump is arranged in a region of the housing opposing the drive unit, and wherein, for mounting auxiliary pumps of different depths, corresponding lids with different axial offsets are provided.