Komatsu Galeo PC138US-8 Shop Manual page 320

SEN02457-01
Cate-
Item
gory
Swing relief
Blade RAISE
Blade LOWER
Travel relief
Control circuit source
pressure
Servo piston input
pressure
LS differential
pressure
Overrun when
stopping swing
Time taken to start
swing
Time taken to swing
4
Applicable model
Test conditions
• Hydraulic oil temperature:
• Engine at high idle
• Pump discharge pressure
• Relieve only circuit to be tested
• Hydraulic oil
Control levers at
temperature:
HOLD
45 – 55°C
At pump relief
• Engine at
(normal actuation)
high idle
• Hydraulic oil
temperature:
All levers at
45 – 55°C
HOLD
• Engine at
high idle
a LS differential
Travel rotating
pressure =
under no load
pump outlet
Travel lever at
port pressure
half-way position
– LS pressure
• For testing posture, see Swing
1
• Engine at high idle
• Hydraulic oil temperature:
• Stop after swinging one turn
and test distance that swing
circle moves
• Figure in ( ) shows movement
at outside of swing circle
• For testing posture, see
Swing 1
• Engine at high idle
• Hydraulic oil temperature:
45 – 55°C
• Time taken to swing 90°
and 180° from starting
position
• Figure in ( ) shows time
when bucket is at rated
load
• For testing posture, see Swing
1
• Engine at high idle
• Hydraulic oil temperature:
• Swing one turn, and test time
taken to swing next 5 turns
Standard value for
Unit
45 – 55°C
MPa
2
{kg/cm }
Target
value
(Range)
45 – 55°C Deg.
(mm)
90°
sec.
180°
sec.
45 – 55°C
20 Standard value table
PC138US-8
Service limit value
new machine
27.1 ± 1.0
{276 ± 10}
+2.0
34.8
+0
{355 +20 }
+0
34.8 ± 1.5
{355 ± 15}
34.8 ± 1.0
{355 ± 10}
3.2 ± 0.2
{33 ± 2}
3.4 ± 1.0
{35 ± 10}
16.0 ± 1.5
{163 ± 15}
2.75 ± 0.98
{28 ± 10}
2.2 ± 0.1
{22.5 ± 1}
Max. 60
(Max. 580) (Max. 676)
2.8 ± 0.3
{3.4 ± 0.3}
4.0 ± 0.4
{4.9 ± 0.5}
27.3 ± 2
PC138US, USLC-8
+1.5
27.1
–2.5
+15
{276 }
–25
+2.0
34.8
–1.0
{355 +20 }
–10
34.8 ± 2.5
{355 ± 25}
34.8 ± 2.0
{355 ± 20}
3.2 ± 0.5
{33 ± 5}
3.4 ± 1.0
{35 ± 10}
16.0 ± 2.5
{163 ± 25}
—
{—}
—
{—}
Max. 70
Max. 3.5
(Max. 4.0)
Max. 6.2
(Max. 6.4)
27.3 ± 4