The device for simplified adjustment of the orbital location of operating rollers (10, 10') of the rotor of a peristaltic pump, in particular for pumps for conveying concrete, cement mixes, plaster, mortar, sludge or the like, comprises crank means (15) which are mounted rotatably on the walls of the rotor, opposite the said rollers (10, 10') and parallel to the axis of rotation (7) of the rotor (9) of the pump. The crank means, by their very nature, may be operated with a rotation applied to only one of their ends which is provided with means (17-19) for reversible fastening to the adjacent wall of the rotor, so as to be able to stabilise the crank in the given angular position, the stem of the said crank and the spindle of the said operating rollers being designed and kinematically connected together using any means such that, with rotation of the crank, it is possible to vary the orbital position of the operating rollers (10, 10') on the rotor (9) of the pump.
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