HYDRAULICS – CX210/CX240
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CX EXCAVATORS
ATTACHMENT
Arm Open (Out)
1) Two pump flows inside the control valve are combined, when the arm1 and arm2 control
spools are shifted.
The oil from pump1 (front pump) enters the P1 port of the control valve and the oil from
pump2 (rear pump) enters the P2 port. When the hand control for arm out is operated pilot
pressure is directed through the cushion valve to the arm1 control spool in the main control
valve. The arm1 control spool is shifted and arm-out is executed. Pump1 is used for the arm
circuit. If arm only is operated flow from pump2 is routed to the arm circuit for dual-pump
operation (2-speed).
The pilot pressure sent from the arm-out pilot control is also sent to the arm2 spool on the
pump2 side of the main control valve. The spool is shifted and diverts pump2 oil to the arm-
out cylinder circuit at the arm1 control spool. Return oil from the cylinder is routed through the
arm1 and arm2 control spools for improved performance.
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