Komatsu ecot3 PC300LC-8 Shop Manual page 476

SEN02663-02
3. Hydraulic drift of work equipment
Fuel
No. Check item
control
dial
Hydraulic drift of
1 Engine stopped
bucket tip
4. Hydraulic circuit
No. Checked part
Fuel
control
dial
Self pressure
1
reducing valve
Main relief valve
2
(Low pressure)
Main relief valve
3
(Low pressure)
4 Unload valve
5 LS valve
MAX
Swing motor
6
safety valve
Main relief valve
Travel motor
7 Safety valve
Travel junction
valve
Checked oil pressure
A (Control circuit basic pressure)
B (Work equipment relief pressure,
low)
C (Work equipment relief pressure,
high)
D (Unload pressure)
E (LS differential pressure)
F (Swing relief pressure)
G (Travel relief pressure)
12
Checking condition
Work-
ing Checking posture, etc.
mode
Boom top horizontal
Arm cylinder retracted fully
Bucket loaded
Checking condition
Work-
Left knob Operation of work
ing
switch equipment
mode
All lever in neutral
OFF
Arm out relief
ON
All levers in neutral
Right track driven idle
Lever moved halfway
Left track driven idle
Lever moved halfway
P
Swing lock
Right swing relief
Swing lock
OFF
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
33.83 – 36.28 {345 – 370}
36.28 – 38.73 {370 – 395}
MPa
2
{kg/cm }
28.42 – 32.85 {285 – 335}
36.29 – 40.21 {370 – 410}
Unit
PC300-8
mm
PC350-8
[1] [2]
60 MPa 60 MPa
{600 kg/ {600 kg/
2 2
cm } cm
F pump R pump
main main
— —
B B
C C
D D
E
—
E
—
F F
F F
G
—
G
—
G
—
G
—
3.03 – 3.43 {31 – 35}
2.9 – 4.9 {30 – 50}
2.35 – 2.55 {24 – 26}
30 Testing and adjusting
Standard
value for Service limit
new value
machine
Max. 450 Max. 675
Max. 550 Max. 825
[3] [4]
60 MPa 60 MPa 6 MPa
{600 kg/ {600 kg/ {60 kg/
2 2
} cm } cm }
F pump R pump
Control
LS LS
A
— —
B B
C C
D D
E
—
E
—
— —
— —
— —
— —
— —
— —
Service limit value
2.84 – 3.43 {29 – 35}
33.34 – 36.77 {340 – 375}
35.8 – 39.23 {365 – 400}
2.9 – 4.9 {30 – 50}
2.35 – 2.55 {24 – 26}
28.42 – 32.85 {285 – 335}
35.8 – 40.7 {365 – 415}
PC300, 350-8
Mea-
sured
value
[5]
2
cm }
—
—
—
—
—
—
—
—
—
—
—