Sauer Danfoss 40 Series - General Description Series 40 Family of Pumps and Motors

520L0635 • Rev EH • June 2009
6
Series 40 Axial Piston Pumps
Technical Information
General description
SERIES 40 FAMILY OF
PUMPS AND MOTORS
Series 40 is a family of hydrostatic pumps and motors for medium power applications
with maximum loads of 345 bar [5000 psi]. These pumps and motors can be applied
together or combined with other products in a system to transfer and control hydraulic
power.
Series 40 pump + motor transmissions provide an innitely 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 ow of uid 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 replenish ing and cooling uid ow, as well as servo control uid ow on M46
pumps. M25 pumps are designed to receive charge ow 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 xed or tiltable swashplate. The family includes M25, M35, M44 xed motor units and
M35, M44, M46 variable motor units. For complete technical information on Series 40
motors, refer to Series 40 Motors Technical Information, 520L0636.
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.
The M46 variable motor is available in a cartridge ange version, which is designed to be
compatible with CW and CT compact planetary gearboxes. This combination provides a
short nal drive length for applications with space limitations.