Testing And Adjusting Oil Pressure In Work Equipment, Swing, And Travel Circuits - Komatsu PC130-7 Shop Manual

TESTING AND ADJUSTING
TESTING AND ADJUSTING
OIL PRESSURE IN WORK
EQUIPMENT, SWING, AND
TRAVEL CIRCUITS
a Testing and adjusting instruments for oil pressure
in work equipment, swing, and travel circuits
Symbol Part No.
799-101-5002
1
790-261-1203
H
799-101-5220
2
07002-11023
a The oil pressure in work equipment, swing, and
travel circuits (pump discharge pressure) can be
checked with monitoring function [02] of the
monitor panel.
• Monitoring code: 011, 012 (Pump discharge
pressure)
a The pump discharge pressure is displayed in 1
2
kg/cm .
MEASURING
1. Preparation work
k Lower the work equipment to the ground
and stop the engine. Operate the control
levers several times to release the residual
pressure in the piping, and then loosen the
oil filler cap of the hydraulic tank slowly to
release the internal pressure of the hydrau-
lic tank.
1) Remove the top cover of the control valve,
and then remove pump pressure pickup plug
(1) from the top of the control valve.
20-122
(1)
TESTING AND ADJUSTING OIL PRESSURE IN WORK EQUIPMENT,
Part name
Hydraulic tester
Digital hydraulic tester
Nipple (10 x 1.25 mm)
O-ring
SWING, AND TRAVEL CIRCUITS
2) Install nipple H2 and connect it to oil pres-
sure gauge [1] of hydraulic tester H1.
a Use the oil pressure gauges of 58.8 MPa
2
{600 kg/cm }.
3) Run the engine and heighten the hydraulic
oil temperature to 45 – 55°C.
2. Measuring unload pressure
1) Start the engine.
2) Run the engine at high idling and set all the
control levers in neutral and measure the oil
pressure.
a The pressure measured when the unload
valve is unloaded is indicated.
PC130-7