Testing And Adjusting Oil Pressure In Work Equipment, Swing, And Travel Circuits - Komatsu Galeo PC138US-8 Shop Manual

30 Testing and adjusting
Testing and adjusting oil pressure
in work equipment, swing, and
travel circuits
a Testing and adjusting tools for oil pressure in
work equipment, swing, and travel circuits
Symbol Part No.
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
J
799-101-5220 Nipple (10 × 1.25 mm)
2
07002-11023
k
Stop the machine on a level ground and
lower the work equipment to the ground.
Then, release the residual pressure from the
hydraulic circuit. For details, see "Releasing
residual pressure from hydraulic circuit".
Testing
a The oil pressure in the work equipment, swing,
and travel circuits (pump discharge pressure)
can be checked with monitoring function of the
machine monitor, too (For details, see "Special
functions of machine monitor").
Monitoring code: 01100 pump pressure
q
a Test the oil pressure in the work equipment,
swing, and travel circuits under the following
condition.
Hydraulic oil temperature: Within operat-
q
ing range
1. Preparation work
1) Open the side cover of the pump room
and remove oil pressure pickup plugs (1)
and (2).
(1): Pump discharge pressure port
q
(1) check plug
(2): Pump discharge pressure port
q
(2) check plug
PC138US, USLC-8
Part name
O-ring
1
2) Install nipples J2 and connect oil pressure
gauges [1] of hydraulic tester J1.
a Use the oil pressure gauges of 58.8
MPa {600 kg/cm
2. Testing unload pressure
1) Start the engine, set the working mode in
the power mode (P), and turn the auto-
decelerator OFF.
2) Run the engine at high idle, set all the
levers and pedals for work equipment con-
trol, swing control, and travel in neutral,
and test the oil pressure.
a The pressure tested when the unload
valve is unloaded is indicated.
SEN02458-01
2
}.
27