System Circuit - Sauer Danfoss 45 Series Service Manual

system CiRCuit

Pictorial circuit diagram
Reservoir
P106 067E
8
Series 45 G Frame Open Circuit Axial Piston Pumps
Service Manual
Introduction
The pump receives fluid directly from the reservoir through the inlet line. A screen
placed in the inlet protects the pump from large contaminants.The output of the pump
is directed to a PVG-32 multi-section load sensing directional control valve which directs
fluid to the actuators in the system. Fluid returning from the system is cooled by a heat
exchanger and cleaned by a filter before returning to the reservoir.
The speed of the actuators in the system depends on the volume of fluid being provided
by the pump.The operating pressure varies depending on actuator load, but is limited to
an adjustable maximum setting by the PC section of the pump control and by a system
relief valve integrated into the side module of the PVG valve.
The position of the PVG valve sets the demand for flow in the system and communicates
this to the pump control by means of a hydraulic signal (load sense signal).The pump will
provide as much flow to the system as it demands
Therefore flow and pressure in the system are compensated to meet requirements.
G Frame Series 45
open circuit axial
piston pump with
load sensing control
Heat exchanger
Filter
1 Full available flow is a function of pump displacement, operating speed, and efficiency. Refer to
Piston Open Circuit Pumps Technical Information,
520L0605 • Rev AB • December 2010
1 while limiting the maximum pressure.
Double-acting cylinder
PVG 32
mulit-section
load
sensing
control
valve
520L0519 for details.
Bi-directional
gear motor
System pressure
Servo pressure
Actuator pressure
Load sense pressure
Actuator return
Suction / case drain /
system return
Series 45 Axial