Komatsu PC500LC-10R Shop Manual page 469

30 TESTING AND ADJUSTING
TEST AND ADJUST OIL PRESSURE IN WORK EQUIPMENT, SWING, AND
TRAVEL CIRCUITS
Tools for testing and adjusting oil pressure in work equipment, swing, and travel circuits
Symbol Part No.
- 799–101–5002 Hydraulic tester
A 1 799–101–5110 Gauge
2 799-101-5130
B - 790-261-1205
C 799–101–5220 Nipple
D 07002–11023
Commercially
E
available
Commercially
F
available
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Place the machine on a level ground, and then lower the work equipment completely to the ground in
a stable posture. Set the lock lever to LOCK position, and then stop the engine.
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Parts and oil are still very hot immediately after the engine is stopped. It may cause burn injury. Wait
for the temperature to go down, and then start the work.
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Lower the work equipment to the ground, and stop the engine. Operate the control lever several
times to release the remaining pressure in the piping. Loosen the oil filler cap of the hydraulic tank
gradually to release the pressure in the tank.
Check this item under the following conditions.
Hydraulic oil temperature: 45 to 55 °C
When the oil flow is divided at pumps, front pump and rear pump act individually to each actuator as following
table. The valve to be relieved differs depending on the actuator.
When the pressure is relieved singly from the work equipment circuit, the oil flows from the pumps are merged.
When the pressure in swing circuit or travel circuit is relieved singly, the oil flows from the pumps are divided.
The actuators in the following table are arranged in the order that the control valves are viewed from the front of
the machine. ("Service" of "Actuator" is for when 1 attachment is installed)
PC500LC-10R
TEST AND ADJUST OIL PRESSURE IN WORK EQUIPMENT, SWING,
Part name
Gauge
Digital hydraulic tester
O-ring
Pin
Plate
AND TRAVEL CIRCUITS
Q'ty Remarks
1
1 Pressure range: 60 MPa
1 Pressure range: 6 MPa
1 Pressure range: 70 MPa
2 Size: M10x1.25 mm
2
1 Size: φ 200x80
1 Size: 250x260x32
30-63