Danfoss 40 series MPV046 MPV044 Variable Hydraulic Pump,MPV046 Piston Pump

Danfoss 40 Series transmissions (pump plus motor) provide an infinitely variable speed range 

between zero and maximum in both forward and reverse modes of operation. The 

pumps and motors each come in four frame sizes: M25, M35, M44, and M46.

Series 40 pumps are compact, high power density units. All models use the parallel axial 

piston / slipper concept in conjunction with a tiltable swashplate to vary the pump’s 

displacement. Reversing the angle of the swashplate reverses the flow of fluid from the 

pump, reversing the direction of rotation of the motor output.

Series 40 M35, M44, and M46 pumps may include an integral charge pump to provide 

system replenishing and cooling fluid flow, as well as servo control fluid flow on M46 

pumps. M25 pumps are designed to receive charge flow from an auxiliary circuit or 

from a gear pump mounted on the auxiliary mounting pad. Series 40 pumps feature 

a range of auxiliary mounting pads to accept auxiliary hydraulic pumps for use in 

complementary hydraulic systems.

Series 40 M46 pumps offer proportional controls with either manual, hydraulic, or 

electronic actuation. An electric three-position control is also available. The M25, M35, 

and M44 pumps include a trunnion style direct displacement control.

Series 40 motors also use the parallel axial piston / slipper design in conjunction with 

a fixed or tiltable swashplate. The family includes M25, M35, M44 fixed motor units and 

M35, M44, M46 variable motor units.

The M35 and M44 variable motors feature a trunnion style swashplate and direct 

displacement control. The M46 variable motors use a cradle swashplate design and a 

two-position hydraulic servo control.