Hydraulic orbital motors MP by M+S Hydraulic are the most popular gerotor type motors. The MP series consists of motors of maximum speed from 95 to 1600 rpm and maximum power from 3.3 to 12.8 kW. Simple and cheap construction works in light conditions and when high speed is required.

Rotational speed range: from 10 through 1600 rpm; maximum continuous pressure: up to 140 bar.

The MP orbital motors are medium size units of light and compact construction. The distribution valve has been integrated with the output shaft. The cardan shaft rotates distruibutor valve and transfers mechanical energy from gerotor set to output shaft. The gerotor has smooth teeth which cooperate without the rolls and this design works well with medium pressure. The valve has hydrodynamic bearings and has infinitie life when load ratings are not exceeded.

In general, MP motors are interchangeable with all motors of OMP, BMP, OMZP, SMP class. However, it appears that durability, efficiency, stability parameters differ between motors from different manufacturers. This becomes particularly important if the work scope of the motor falls in the upper parameters of the catalogue values.


  • Displacement: 25 – 123.8 cm3/rev;
  • Rotational speed range: 10 – 1600 rpm;
  • Maximum pressure: from 100/225 bar through 140/225 bar (continuous/peak);
  • Maximum power: 4.5 – 10.5 kW.


  • Higher rotational speeds than those available by geroler motors;
  • Reinforced shaft seals;
  • The motor can be used in parallel or series configurations;
  • Low noise level;
  • Compact volume and easy installation;
  • Simple and cheap construction for lighter purposes.


The MP motors are primarily used in agricultural machines, forklifts, small garden machinery, small loaders, to unloading tankers etc. A simple and cheap construction works in light conditions and in applications where higher speeds than comparable type of geroler motors can achieve. These MP motors achieves much lower torques at the same time. For heavy duty applications MR motors are recommended.

Technical data of MP motors2532405080100125
Displacement [cm3/rev]25324049,579,299123,8
Max rotational speed (conti.) [rpm]1600156015001210755605486
Max rotational speed (inter.) [rpm]1815172017501515945755605
Max flow [lpm]40506060606060
Torque per bar [Nm/bar]0,330,430,520,671,081,381,69
Max pressure drop conti./peak [bar]100/225100/225120/225140/225140/225140/225140/225
Max power conti. [kW]4,55,88,410,110,210,510,2
Weight [kg]5,65,65,75,85,96,16,2