The MR orbital motors by M+S Hydraulic are medium size and light construction hydraulic motors. They are characterized by appreciable torque and low rotational spees. The MR series consists of models with rotational speed range from 150 to 775 rpm and maxiumum output power range from 4 to 13 kW.

Rotational speed range: from 10 through 775 rpm; maximum continuous pressure: up to 175 bar.

The MR orbital motors are medium size units with gerotor set equipped with rollers. It causes high starting torque, low pressure at start and work at high allowable pressure, but low maximum rotational speed at the same time. The cardan shaft rotates distributor valve and transfers mechanical energy from gerotor set to output shaft. valve has hydrodynamic bearingd and has infinite life when load ratings are not exceeded.

The MR motors are interchangeable with all motors of OMR, BMR, OMZR, SMR etc. in general. However, it appears that durability, efficiency and stability of parameters of motors are different from series of motors by various manufacturers.


  • Displacement: 51,5 – 397 cm3/rev;
  • Rotational speed range: 10 – 775 rpm;
  • Maximum pressure: from 65/115 bar through 175/225 bar (continuous/peak);
  • Maximum power: 4,8 – 13 kW.


  • Low starting pressure;
  • Reinforced shaft seals;
  • Possibility of serial and parallel combination of motors;
  • Low noise level;
  • Compact design and easy installation;
  • Higher torque and power than MP motors.


The MR motors are used in heavy duty winchers insensitive to wetting, in high power crushers, in forestry machines, driving vehicles and other applications.

Technical data of MR motors5080100125160200250315400 
Displacement [cm3/rev]cm3/obr51,580,399,8125,7159,6199,8250,1315,7397
Max rotational speed (conti.) [rpm]obr/min775750600475375300240190150
Max rotational speed (inter.) [rpm]970940750600470375300240190
Max flow [lpm]l/min406060606060606060
Torque per bar [Nm/bar]Nm/bar0,711,141,371,712,232,753,554,245,85
Max pressure drop conti./peak [bar]bar140/225175/225175/225175/225175/225140/225110/20085/15065/115
Max power conti. [kW]kW712,51312,511,59854,8
Weight [kg]kg6,86,97,27,37,588,49,19,8