Komatsu Galeo PC138US-8 Shop Manual page 447

30 Testing and adjusting
4. Hydraulic circuit
No. Checked part
Fuel
control
dial
Self pressure
1
reducing valve
2 Main relief valve
3 Unload valve
4 LS valve
MAX
Swing motor
5
safety valve
Main relief valve
Travel motor
6 Safety valve
Travel junction
valve
Checked oil pressure
A (Control circuit basic pressure)
B (Work equipment relief pressure)
C (Unload pressure)
D (LS differential pressure)
E (Swing relief pressure)
F (Travel relief pressure)
* Gauge changing work: Change hoses of gauges [3] and [4].
No. Check item
Fuel
control
dial
7 Servo piston MAX
Checked oil pressure
H (Servo control pressure)
PC138US, USLC-8
Checking condition
Work-
ing Operation of work equipment
mode
All lever in neutral
Arm out relief
All levers in neutral
Right track driven idle
Lever moved halfway
Left track driven idle
Lever moved halfway
Swing lock
P
Right swing relief
Swing lock
Left swing relief
Right travel lock
Right forward relief
Right travel lock
Right reverse relief
Left travel lock
Left forward relief
Left travel lock
Left reverse relief
Unit Standard value for new machine
33.8 – 35.8 {345 – 365}
MPa
2
{kg/cm }
28.2 – 30.2 {288 – 308}
33.8 – 35.8 {345 – 365}
Checking condition
Work-
ing Operation of work equipment
mode
P Arm out relief
Unit Standard value for new machine
—
[1] [2]
600K 600K
Pump Pump
main 1 main 2
— —
B B
C1 C1
D1
—
D1
—
E E
E E
F
—
F
—
F
—
F
—
3.0 – 3.4 {31 – 35}
1.8 – 3.8 {18 – 38}
2.1 – 2.3 {21.5 – 23.5}
[1] [2]
600K 600K
F pump R pump
main main
H1 H1
H1 : H2 = 1 : 0.6
(Oil pressure ratio)
SEN02460-01
[3] [4] [5]
600K 600K 60K
Pump Pump
Control
LS 1 LS 2
A
— —
— — —
C2 C2
—
D2
— —
D2
— —
— — —
— — —
— — —
— — —
— — —
— — —
Service limit value
2.7 – 3.7 {28 – 35}
33.8 – 36.8 {345 – 375}
1.8 – 3.8 {18 – 38}
2.1 – 2.3 {21.5 – 23.5}
26.7 – 30.7 {273 – 313}
32.8 – 36.8 {335 – 375}
[3a] [4a] [5]
600K 600K 60K
F pump R pump
Control
servo servo
H2 H2
—
Service limit value
11