KYB Hydrostar MRH and MR Radial Piston Motors


KYB Hydrostar MRH and MR series motors are low speed high torque (LSHT) radial piston motors. They act as a very durable ‘workhorse’ in a wide variety of industries and applications,

With displacements from 208 cc/rev (12.7 in³/rev) to 8795 cc/rev 536.7 in³/rev the series comprises :

  • Single displacement models: MRH-12 | MRH-30 | MRH-45 | MRH-60 | MRH-80 | MRH-95 | MRH-135 | MRH-190 | MRH-270 | MRH-375 | MR-525 and MRHD-540
  • Multiple displacement models include: MRH2-45-1 | MRH2-45-2 | MRH2-95-1 | MRH2-95-2 | MRH2-135-1 | MRH2-135-2 | MRH2-190-1 | MRH2-190-2 | MRH2-270-1 | MRH2-270-2 | MRH2-375-1 | MRH2-375-2.

Features include:

  • Speed is infinitely variable and the torque is constant over the entire speed range;
  • Excellent efficiency allows precise positioning of driven equipment;
  • Rapid acceleration, deceleration and reversing;
  • Large main bearings assure long life and allow heavy side load capacity;
  • 25 standard models offering up to 20,000 lb. torque;
  • Many multiple displacement models;
  • SAE ports including 4 bolt flanges and straight threads;
  • SAE splines and tapered keyed shafts are standard;
  • Several drain port locations to ease mounting;
  • Seals made of VitonÆ.

Hydrostar MRH MR Series Technical Catalogue >>>

Click on the “Model Codes and Technical Data” tab for more details on the full range of KYB Hydrostar MRH and MR series motors.

Contact us for further technical details and configuration option

Single Displacement

 Displ. in³/rev (cc/rev)Max Cont. Pressure (psi)Inter. Peak Pressure (psi)Speed Range (rpm)Max Cont. Power (hp)      
MRH-1212.7 (208) 53535703-60042
MRH-3030.4 (498)130035703-50085
MRH-4545.5 (746)204035703-400120
MRH-6061.3 (1005)256035703-380155
MRH-8082.8 (1357)356035703-300175
MRH-9593.4 (1531)413035703-300190
MRH-135133.9 (2194)594035703-220200
MRH-190191.6 (3140)867535703-175230
MRH-270268.4 (4398)1164835703-125225
MRH-375377.5 (6186)1630035703-120300
MR-525523.9 (8585)1952030003-80220
MRHD-540536.7 (8795)1980030003-100280

Multiple Displacement

 Displ. in³/revMax Set. Pressure (psi)Inter. Peak Pressure (psi)Max Speed Range (rpm) @ 3000 psi Max Speed Range (rpm) @ 3570 psi Max Free Wheeling Speed (rpm)Max Horse Power (hp)      
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