HYDRAULICS – CX130/CX160
5 - 28
CX EXCAVATORS
ATTACHMENT
Arm Open (Out)
1) Two pump flows inside the control valve are combined, when the arm1 and arm2
spools are shifted.
The oil flow from pump1 (front pump) enters the PR port of the control valve and the oil flow
from pump2 (rear pump) enters the PL port. When the hand control is operated for arm out
pilot pressure is directed to the cushion valve. It is then routed to the arm control spool in the
main control valve. The arm1 control spool is shifted arm-out movement is executed. Pump2
is used for arm-out. If arm only is operated flow from pump1 is routed to the arm circuit for
dual-pump operation. (2-speed)
The pilot pressure to the arm1 control spool is sent to the arm2 control spool on the other
side of the main control valve. The control spool is shifted and sends pump1 oil flow to the
arm opening cylinder circuit at the arm1 control spool. Return oil from the cylinder is routed
through the arm1 and arm2 control spools for improved performance during arm out.
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