Komatsu Galeo BR380JG-1E0 Shop Manual page 293

30 Testing and adjusting
(3): Front LS pressure pickup plug
q
(4): Rear LS pressure pickup plug
q
2) Install nipple M2 and connect it to differen-
tial pressure gauge M3 or the oil pressure
gauge [1] of hydraulic tester M1.
a When using differential pressure gauge
M3:
Connect the pump discharge pres-
sure to the high pressure side (back
side) and connect the LS pressure to
the low pressure side (lower side).
Since the differential pressure gauge
needs a 12V power source, connect it
to a battery.
a When using oil pressure gauge (in M1):
Use the oil pressure gauge of 58.8
MPa {600 kg/cm
0.98 MPa {10 kg/cm
ferential pressure is about 3.9 MPa
{40 kg/cm
by installing the same gauge to the
pickup plugs alternately.
The figure shows the pump discharge
q
pressure side.
BR380JG-1E0
2
} having the unit of
2
}. Since the dif-
2
} at maximum, measure it
The figure shows the LS pressure side.
q
3) Run the engine.
4) While running the engine at high idle
under the condition shown in the table,
measure the pump discharge pressure
and LS pressure (actuator load pressure)
simultaneously.
a Calculation of LS differential pressure:
LS differential pressure = Pump dis-
charge pressure – LS pressure
All work equipment switches
OFF
ON (No load)
5) After finishing measurement, remove the
measuring tools and return the removed
parts.
SEN02303-00
LS differential
pressure
(MPa {kg/cm 2 })
3.9 ± 1.0
{40 ± 10}
0.98 ± 0.1
{10 ± 1.0}
35