Hydraulic pump or hydraulic motor with a rotating, in a stationary manner in the housing (6a, 6b) mounted shaft (5), on which a pulse generator (4) is provided, and with a in the housing wall along a insertion axis (2) used and on the housing (6a, 6b) fixed rotational speed sensor (1a), the one arm of the pulse generator (4) is assigned to the sensor element (3), characterised in that the sensor element (3) and, offset with respect to the off-center insertion axis (2) of the rotational speed sensor (1a) is mounted, wherein said rotational speed sensor (1a) than l - a built-in part is formed on its first leg (14) the sensor element (3) and at whose second leg (15) which is movable along the (2) is inserted into the housing wall, fastening means (11) for installation in the housing (6a, 6b) are provided, with the first, the sensor element (3) supporting leg (14) of the l - shaped rotary speed sensor (1a) is longer than the second leg (15) and in such a manner to the free space between the shaft (5) and the housing wall is adapted to the wall that it..
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