Komatsu Galeo BR380JG-1E0 Shop Manual page 289

30 Testing and adjusting
3) Start the engine.
4) While running the engine at high idle,
relieve the travel circuit and measure the
pump discharge pressure and PC valve
output pressure (servo piston inlet pres-
sure) simultaneously.
a Measuring condition and method of
judgment: If the pressures are in the
following ratio, the PC valve is nor-
mal.
Measured oil
pressure
Pump discharge
pressure
PC valve output
pressure
a If the PC valve or the servo piston is
abnormal, the PC valve output pres-
sure (servo piston inlet pressure) is
"the same as the pump discharge
pressure" or "almost 0".
5) After finishing measurement, remove the
measuring tools and return the removed
parts.
BR380JG-1E0
Ratio of oil
Condition
pressures
1
Travel relief
Approx. 0.6
(Approx. 3/5)
2. Measuring PC-EPC valve output pressure
1) Remove oil pressure pickup plug (5).
2) Install nipples L2 and connect them to oil
pressure gauges [1] of hydraulic tester L1.
a Use the oil pressure gauges of 5.9
MPa {60 kg/cm
3) Start the engine.
4) Turn OFF
switches, run the engine at high idle and
low idle, and measure the oil pressure at
each speed.
SEN02303-00
2
}.
all the work equipment
31