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HYDRAULIC CIRCUIT
CASE TRAINING CENTER
AUGUST 2000
Pump engine stopped
Description of the schematic
A & B, A' & B': Servo-piston of the tilting swash plate
C : Compensation spool. It measure the amount of pressure of both pump outlets by
reducing the highest pressure
area S' = diameter area S and S + S' = S"
D & D' Torque regulation spool, used to limit mechanically the torque of the pump
E & E' Negative flow control valve, used to limit the pump flow according the operator demand
F Proportional solenoid valve, used to adjust the torque of the pump according the work
mod selected (L, S , H or AUTO)
Engine stop, the servo piston is not pushed by the compensated pump pressure of the spool C and the pump
swash plates are totally pushed in full flow position.
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