Testing And Adjusting Oil Pressure In Work Equipment, Swing And Travel Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

30 Testing and adjusting
Testing and adjusting oil pressure
in work equipment, swing and
travel circuit
a Testing and adjusting tools for hydraulic oil pres-
sure in hydraulic circuit for work equipment,
swing and travel
Symbol Part number
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
L
799-101-5220 Nipple (10 × 1.25 mm)
2
07002-11023
a Checkup of the oil pressure in the work equip-
ment, swing, and travel circuits (pump discharge
pressure) is also available from the monitoring
function of the machine monitor (Special func-
tions of machine monitor).
Measurement
1. Preparation work
k
Lower the work equipment to the ground
and, after stopping the engine, release re-
sidual pressure in the piping by operating
the control lever several times. Then loos-
en the oil filler cap gradually to release
pressure inside the tank.
1) Remove hydraulic oil pressure measuring
plugs (1) and (2).
Plug (1): For the front pump circuit (situat-
q
ed in the rear side of the machine)
q Plug (2): For the rear pump circuit (situat-
ed in the front side of the machine)
PC300, 350-8
Part name
O-ring
2) Fit nipple L2 and connect it to oil pressure
gauge [1] of hydraulic tester L1.
a Use the oil pressure gauge with capacity
60 MPa {600 kg/cm
3) Start the engine and keep it running until the
hydraulic oil temperature rises to the oper-
ating range.
2. Combination of pump, actuator, and valve
a Care must be exercised when the oil from the
pump is diverted since, at this time, the actu-
ators of the front pump and rear pump work
independently, relieving different valves.
a When the work equipment circuit or swing cir-
cuit is relieved singly, the oil of the pumps is
diverted.
a The actuators in the table are arranged in the
order when the control valve is seen from the
front of the machine.
SEN02625-06
2
}.
35