Vickers M2U and M2-200 Series High Speed Hydraulic Vane Motors

General Information

These motors offer a combination of low cost, pressures to 138 bar (2000 psi), speeds to 2800 r/min, torques of
2.0, 2.8 or 4.0 Nm/6.9 bar (18, 25 or 35 lb. in./100 psi), flange or foot mounting, and choice of port locations.


M2U motors operate in one direction only, and rotation must be specified when ordering. Shaft rotation of
M2-200 motors can be reversed simply by reversing the direction of flow through the motor ports.

Low Speed Capability

Minimum speed can vary between 50 and 100 r/min , depending upon motor size and characteristics of the driven load.


An economical, efficient and compact means of applying variable speed, rotary hydraulic power, these motors
have variable horsepower (constant torque) characteristics. They can be stalled under load without damage when protected by a relief valve.

Indirect Drive Capability

Rugged two-bearing construction permits motors to be used in direct or indirect drive installations. Indirect drive
applications require approval by Vickers Engineering Department.

Replaceable Cartridge

Rotary motion is developed within the drive cartridge which consists principally of a cam ring, rotor, ten vanes, and two pressure plates. the cartridge is bolted together so parts can be serviced separately or as an assembly. Replaceable cartridges permit motor overhauls in just 10 minutes. A cartridge can be replaced without removing the
unit from the machine, and usually without disconnecting hydraulic lines.

Features and Benefits

Low-wear Design

Two internal inlet chambers are diametrically opposed as are two outlet chambers. This construction eliminates
bearing loads resulting from pressure, a major cause of wear in designs without this feature.

Installation Flexibility

The motor’s cover can be assembled in different positions with respect to the body. To change the relative location of the ports, it is necessary only to remove four cover bolts and rotate the cover to the desired position.
This allows optimum positioning to suit
connecting piping.

High Efficiency

Optimum running clearances and hydraulic balance assure sustained high efficiency over the life of the motor.

Smooth Operation

Inertia of rotating parts is low … parts are symmetrical, providing dynamic balance and freedom from vibration.


Model Torque Displacement Maximum speeds & presures Approx Weight
Series Nm/6,9 bar cm³/r (in³/r) (Kg (lb)
(lb in/100 psi
M2U 2,0 (18) 21,6 (1.32) 2800 r/min @ 138 bar (2000 psi) 7,7 (17)
2,8 (25) 25,4 (1.55) 2500 r/min @ 138 bar (2000 psi)
4,0 (35) 37,5 (2.29 2000 r/min @ 138 bar (2000 psi)
M2–200 2,8 (25) 24,7 (1.51 2200 r/min @ 138 bar (2000 psi) 9,5 (21)
4,0 (35) 35,4 (2.16 1800 r/min @ 121 bar (1750 psi)

Application and Service Information

Motor Characteristics

Minimum Operating Speed

Normal speeds can be as low as 50 to 100 r/min for M2U and M2-200 motors, depending upon motor size and characteristics of the driven load.

The minimum speed for 25M – 50M motors is normally 100 r/min. Lower speeds are permissible, depending
upon torque requirements and characteristics of the driven load.

Stall Torque

Motor stall torque ranges between 65% and 100% of 1200 r/min running torque for a given pressure differential across the motor. This is dependent on the specific angular position of the shaft at stall and the volume supply of fluid to the motor.

Retarding and Braking

Motors may be used as retarders but not as hydraulic brakes. When a motor is used as a retarder, adequate pressure must be provided at the inlet port to prevent cavitation. Systems requiring positive holding capabilities (braking) must be provided with externally operated mechanical holding devices.

The maximum pressure obtainable in a system using a motor as a retarder (pumping) is dependent upon speed.
At speeds below 1000 r/min, maximum obtainable pressure is proportionally diminished relative to speed as speed
approaches stall. Consult your Vickers representative before using motors as retarders, or if braking is required.

Mounting Dimensions


Dimensional control requirements of the customer’s mounting pad to which the motor is affixed are as follows.

Pilot Diameter

Concentricity of the customer’s female pilot diameter relative to the effective axis of the female drive must be within
0,10 mm (.004 in.) total indicator reading. The clearance between the male and female pilot diameters must be +0,01 mm to +0,05 mm (+.0005to +.0020 inch.)

Mounting Face

The customer’s mounting face to which the motor is affixed must be square to the axis of the female drive within 0,04 mm per mm (.0015 inch per inch).


Dimensions of keyed shaft receivers must be between +0,003 and +0,03 mm (+.0001 and +.0010 inch) of the maximum shaft diameter shown on the Vickers installation drawing.


Direct drive through a flexible coupling is recommended but belt, chain or gear drives can be used. Indirect drive
applications require approval by Vickers Engineering Department.


Fluid Type

Motors can be used with anti-wear hydraulic oil, or automotive type crankcase oil (designations SC, SD, SE, SF, or SG) per SAE J183 JUN89. Before starting the motor, fill its case with oil. The case must be kept full at all times to provide internal lubrication.


Normal operation (at rated conditions) is based on the use of petroleum oil in the 49 to 65C (120 to 150F)
range. An operating temperature of 49C (120F) is recommended. Normally, temperatures should not exceed 65C (150F).


The oil viscosity range with the motor running should be 13-54 cSt (70-250 SUS).

Application Guidance

To ensure optimum motor performance in conjunction with your specific application, consult your Vickers representative if your:

  • Oil viscosity at operating temperature  is not within 13-54 cSt (70-250 SUS)
  • Oil viscosity at startup is is in excess of 860 cSt (4000 SUS)
  • Operating temperature is not within 38 to 65C (100 to 150F). With proper application and fluid consideration, a greater temperature range is permissible.
  • System requires fire resistant fluid
  • Required minimum speed is less than 100 r/min
  • Application has over running loads
  • Needs require application assistance

Download Datasheet: Vickers M2U and M2-200 Series High Speed Vane Motors