HYDRAULICS – CX130/CX160
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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.
Oil in the neutral passage of the control valve is directed from the FL and FR ports of the
control valve to the PZ1 port of pump1 (front pump) and the PZ2 port of pump2 (rear pump)
as a de-stroke control signal. The de-stroke control signal pressure which enters port PZ1
and PZ2, through servo valves, sets the swash plate angles of the pumps at minimum and
results in minimum flow rate (negative flow control).
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