HYDRAULICS – CX210/CX240
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CX EXCAVATORS
FEATURES
Neutral Pump De-Stroke
1) If the flow output of P1 or P2 hydraulic pump is not needed the output is kept at a
minimum flow rate (negative control flow rate), and energy consumption is reduced.
The negative flow control sets the hydraulic pump at minimum flow rate and reduces energy
consumption in neutral no-load mode.
Pump flow through the open center passage of the main control valve is routed through a de-
stroke valve before exiting to the reservoir. The destroke valves creates backpressure in the
neutral circuit. This backpressure is directed from the ps1 and ps2 ports of the control valve
to the pi1 port of pump1 (front pump) and the pi2 port of pump2 (rear pump) as a de-stroke
control signal. The de-stroke control signal pressure which enters port pi1 and pi2, through
servo valves, sets the swash plate angles of the pumps at minimum and results in minimum
flow rate (negative flow).
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