Komatsu Galeo PC138US-8 Shop Manual page 324

SEN02457-01
Pump performance curve
TVC current: 0.4 A
q
Pump speed: At 2,400 rpm (Engine rated speed at 1,800 rpm)
q
Test pump
Check point
(MPa {kg/cm
As desired
a As far as possible, bring pump discharge pressure P1 and P2 as close as possible to the average pres-
sure when testing.
The error is large near the point where the graph curves, so avoid testing at this point.
a When testing with the pump mounted on the machine, if it is impossible to set the engine speed to the
specified speed with the fuel control dial, take the pump discharge amount and the engine speed at the
point of test, and use them as a base for calculating the pump discharge amount at the specified speed.
a Pump delivery Q in the graph is the delivery from 1 side of the pump.
8
Discharge
discharge pressure of
pressure other pump
}) (MPa {kg/cm
2
P1 P2
Average
pressure
(MPa {kg/cm })
2
})
2
P1 + P2
2
20 Standard value table
Standard value for Judgement
discharge amount standard lower
Q (l/min) limit Q (l/min)
See graph See graph
PC138US, USLC-8