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Service Manual
Series 45 Frame K2 Open Circuit Axial Piston Pumps
Features
©
Danfoss | April 2017
Electric Dump Valve PC/LS Controls
The electric dump valve pressure-compensated/load sense control allows the pump to operate as a
PC/LS type control under normal operating conditions. The solenoid dump valve overrides the LS control,
allowing the pump to operate in a Low-Pressure Standby mode. This function provides reduced
horsepower and torque loss in certain situations. It may be particularly useful to reduce loads on a system
during engine start.
When closed, the solenoid valve allows the control to act as a PC/LS control. When open, the solenoid
valve allows flow from the incoming load sense pressure to dump to case. This reduces the pressure in
the LS spring cavity, shifting the LS spool, and allows the pump to de-stroke to the Low-Pressure Standby
condition. This control is for applications needing a PC/LS control with the ability to switch to Low-
Pressure Standby electronically. The solenoid valve is only available in a normally closed configuration.
Electric Dump Control
Load Sense
Connection
LS adjustment
PC adjustment
System pressure
Servo pressure
Load Sense Pressure
Drain
Solenoid
LS spool
PC spool
AX00000301en-US0101 | 15
P108589
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