Komatsu ecot3 PC300LC-8 Shop Manual page 386

SEN02625-06
4) Increase the hydraulic oil temperature to the
operating range.
5) Measure the pump discharge pressure and
LS pressure (actuator load pressure) at the
same time after setting the following condi-
tions with the engine running at high idle.
q Working mode: P-mode
Travel speed: Hi
q
q Work equipment, swing and travel: When
all levers are at neutral and when travel
lever is at half stroke (one side of travel is
at idle)
a Let the raised track shoe idly rotate, pay-
ing enough attention to the surroundings
for safety.
a Calculation of LS differential pressure:
LS differential
discharge pressure - LS pressure
a If LS differential pressure is in the follow-
ing conditions, it is judged normal.
Lever operation
When all levers are set
to neutral
Travel lever set at half
stroke
6) Remove the measurement tools after the
measurement, and make sure that the
machine is back to normal condition.
46
pressure = Pump
LS differential
pressure
Unload pressure
(See standard
value)
Maximum LS
differential pres-
sure
3. Measurement of LS-EPC valve output pres-
sure
1) Remove oil pressure measurement plug (7).
a The plug is installed on the rear pump.
2) Fit nipple M2 and connect it to oil pressure
gauge [1] of hydraulic tester M1.
a Use the oil pressure gauge with capacity
6.0 MPa {60 kg/cm
3) Start the engine and keep it running until the
hydraulic oil temperature rises to the oper-
ating range.
30 Testing and adjusting
2
}.
PC300, 350-8