Hyundai HX140L, Manual

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2-14
Flow reset function
刯
As the self pump delivery pressure P1 or the companion pump delivery pressure P2 decreases,
the compensating rod (623) is pushed back by the action of the springs (625 & 626) to rotate
lever 1 (612) around point E. Rotating of lever 1 causes the feedback lever (611) to rotate
around the fulcrum of point D and then the spool (652) to move to the left. As a result, port CL
opens a way to the tank port.
This causes the servo piston to move to the left and the pump's delivery rate to increase.
The movement of the servo piston is transmitted to the spool by the action of the feedback
mechanism to move it till the opening between the spool and sleeve is closed.
651 625
P1
B(E)
897
875
D
Servo piston
Large diameter
chamber
621 652 623 612 601 626
Small diameter
chamber
P1 P2
F
611
CL
14W92RG04