Komatsu PC88MR-10 Shop Manual page 393

2) Set the working mode to Power Mode (P).
3) Run the engine at high idle, operate the right
and left work equipment control levers to
relieve the cylinder, and measure the oil
pressure.
a The pressure at the time when the main
relief valve of the control valve is relieved
is displayed.
4. Testing the travel relief pressure
1) Run the engine, and lock the travel
mechanism.
Insert pin [2] between the sprocket
and the track frame to securely lock
the track.
2) Set the working mode to Power Mode (P).
3) Run the engine at high idle, operate the
travel lever and pedal to relieve the travel
motor circuit, and measure the oil pressure.
Before operating the travel lever
(pedal), check the pin position and
locked direction of the travel again.
a The pressure when the main relief valve
of the control valve cracks is relieved is
displayed. The travel circuit is always
relieved at high pressure.
5. Work after finishing test
After finishing the test, remove the testing tools,
and restore the machine.
Oil pressure pickup plug:
20 to 27 Nm {2.0 to 2.8 kgm}
Measuring method by using machine monitor
a The oil pressure in the work equipment and
travel circuits (pump discharged pressure) can
be checked from the "Pre-defined Monitoring" or
the "Self-define Monitoring" screen of the
machine monitor.
1. Start the engine and set the machine monitor to
the "Pre-defined Monitoring" or the "Self-define
Monitoring" screen.
PC88MR-10
30 Testing and adjusting
a For the setting method, see "Special
functions of machine monitor".
""Monitoring code: 01100 "Pump pressure"
"Pre-defined Monitoring (07/11)" screen
"Self-define Monitoring" screen
2. Increase the hydraulic oil temperature to 45 to
55°C and measure the pump discharged
pressure.
a For the measuring procedure, see
"Measuring method by using oil pressure
gauge".
Adjusting
(PC88MR-C000-270-K-00-A)
a The unload valve cannot be adjusted.
Adjustment of work equipment and travel relief
pressure
a If the work equipment and travel relief pressure
is not normal, adjust main relief valve (3) of the
control valve according to the following
procedure.
Hydraulic system
30-43