Hydraulic Circuit Diagram - Komatsu PC20R-8 Shop Manual

HYDRAULIC CIRCUIT DIAGRAM

PC20R-8
Hammer
P2
T B9 A9
P
i2
PPC valve
work equipment
T
P
R.H. PPC valve
Bucket
Close
Open Raise
P3 P4 P1
PC20R-8 PC27R-8
Arm
Bucket Boom Boom swing
cylinder cylinder cylinder cylinder
A6 A5
P B9 B8 A8 P B8 B7 A7 P B7 B6 P B6 B5
P A9 P A8 P A7 P A6
A
0.2
T
P
ST1 solenoid valve
Boom Arm
Close
Lower
T
P
P2 P1
100 mesh
Swing motor
Left
A
B
Right
T
B4 A4 B3 A3 B2 A2 B1 A1 P B1 LS
P A1
Cylinder block
B
0.2
S
Accumulator
v = 0.35
L.H. PPC valve
Swing
Open Left Right
T
P
P2 P4 P3
100 mesh
Swivel
T2
joint
P1
G
F
P2
A
C
H
D
B
P1
E
P2
T1
Blade cylinder
TS
C
Oil cooler
P S
P1
Ø 1.0
Ø 2.0
Hydraulic
pump
Ø 1.0
E
M
O
PL S
R.H. travel motor
Ps
Reverse
Forwards
Reverse
Forwards
Ps
L.H. travel motor
1.5 ± 0.2 bar
Hydraulic tank
P2
S1
RKP04401
10-17