DEUTZ-FAHR AGROTRON 106 MK3, Workshop Manual

Page: 88 / 150

10-70
OPERATING PRINCIPLE
Swash-plate angle control
•
The swash-plate angle of the pump (and consequently the pump displacement), is controlled in such a way that the
pressure difference
∆
PR between the pump delivery pressure PP and the delivery pressure PLS to the load at the
work port of the control valve is maintained at a constant value. (
∆
PR = Pump delivery pressure PP -- PLS delivery
pressure to load).
•
If the pressure difference
∆
PR falls relative to the pressure setting of the LS valve, the swash plate angle will increase.
If the pressure difference
∆
PR rises, the swash plate angle will decrease.
★
For details of this mechanism, see the description of the «HYDRAULIC PUMP».
Directional
control valve
Delivery pump
Control piston
TP Valve
LS Valve
PP
PLS T
α
D0004841
HYDRAULIC SYSTEM LOAD SENSING VALVE, PRESSURE CUT-OFF VALVE