Komatsu PC500LC-10R Shop Manual page 193

Hydraulic excavator
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10 STRUCTURE AND FUNCTION
In B mode or L mode, engine output is kept constant.
The controller controls pump absorption upper limit torque
(PT) so that the engine torque is kept constant along the
equal engine horsepower curve.
PC500LC-10R
ENGINE AND PUMP COMBINED CONTROL SYSTEM
10-99

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