Features And Options - Sauer Danfoss 40 Series Technical Information

Series 40 Axial Piston Pumps
Technical Information

Features and options

CHaRGe PumP Charge flow is required on all Series Charge pump in series 40 - M35 PV
40 units applied in closed circuit
installations to make up for internal
leakage, maintain positive pressure in
the main circuit, provide flow for cooling,
replace any leakage losses from external
valving or auxiliary systems, and on M46
units, to provide flow and pressure for
the control system.
Maintain rated charge pressure under
all conditions of operation to prevent
damage to the transmission.
P100 589E
All Series 40 pumps (except M25 pumps) may be equipped with integral charge pumps.
These charge pump sizes have been selected to meet the needs of a majority of Series 40
applications.
Many factors influence the charge flow requirements and the resulting charge pump
size selection.These factors include system pressure, pump speed, pump swashplate
angle, type of fluid, temperature, size of heat exchanger, length and size of hydraulic lines,
control response characteristics, auxiliary flow requirements, hydraulic motor type, etc.
In most Series 40 applications a general guideline is that the charge pump displacement
should be equal to or greater than 10% of the total displacement of all units in the
system.
The total charge flow requirement is the sum of the charge flow requirements of each of
the components in the system. Use the information provided on the following pages to
make a charge pump selection for a given application.
25
520L0635 • Rev EH • June 2009