Fav 900
Hydraulic Equipment / External Pressure Control
LS-Pressure Enhancement
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General
06.12.2000
9666 000001
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LS-Pressure Enhancement
Text-module
PM-Picturemodule
Generalities:
Further Names: (e.g Opera-
ting Manual)
"External Pressure increase"
Applications: All Tractors with the Option "External Pressure Control"
Reason: Hydraulic hoses are creating substantial pressure losses within P - Hose,
in such an extend that the Difference of control Pressure (Control - delta -
p) on the Implement Control Bloc will not be sufficient. As a result the
Load Sensing Pump will not generate full Power.
Goal : Increasing Control Pressure difference on external Valve
Prinzip: By opening shutoff valve AVLS, load sensing pump Pressure will be par-
tially (approx 8 bar) led to the LS - Pressure. Advantage: Basic hydraulic
settings will not be modified. Pressure Increase is independant of the
control Pressure.
Detailed - Function: A small oil flow of the load sensing pump is led via the Orifice BL 7 to LS -
Line. Due to the added flow, the Control Pressure Level will be offset up-
stream of the LS Pump by approx. 8 bar on top of the losses in the LS line.
Detailed - Function:
Orifice Bl 6 in LS: generates the Pressure difference of approx. 8 bar
Orifice Bl 7 in P: Flow 1 - 1,5 l/min
Non Return Valve RV9 Reliability of steering (Without RV9, steering Pressure could fail in case
of an overloaded Load Sensing Pump)
Monitoring: None
Detailed Diagram
PMTAB_Picture
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