GROUP 1 HYDRAULIC CIRCUITGROUP 1 HYDRAULIC CIRCUIT
SECTION 3 HYDRAULIC SYSTEMSECTION 3 HYDRAULIC SYSTEM
3
Au
GB
SH
PG
Dr
GA
B(cw)
A(ccw)
TRAVEL-RH
ARM2
BUCKET
TRAVEL-LH
STRAIGHT
TRAVEL
ARM1
OPTION
BOOM1
BOOM2
SWING
DR#,dr#
PH
(MCV)
T(dr1)
PG(S/Motor)
PP(MCV)
A1
A2
A3

PS
Pk
(T/Joint)
A2
A1
A3
(Pi2,Pump)
(Pi1,Pump)
PSPS
PS
P1
T
P2
PS
SWING ARM
BUCKET BOOM
pb1 pa1
(3)
(4)
(3,F)
(1,G)
TRAVEL
pb6
pa6
(1)
(2)
(2,D) (4,E)(3,B)
(1,A)
a
b

PS
PS
aeh
f
g
j
db
1
2
3
c
d1
h1
PT
BA
T3
T1
T2 T4
pa10
B9
A9
pb9
pa9
B8
A8
pb8
pa8
DR2
pc2
A7

pb4
A4
B4
pa5
pb5
A5
B5
pc1
DR1
pa11
S
MA
Reverse
Forward
B
A
RH
R/G
MB
X
Bre
S
MA
Reverse
Forward
B
A
LH
R/G
MB

23
10
11
31
32
30
8
9
23
33
24
24
24
22
33
26
24
Shuttle block
1 Main pump
2 Main control valve
3 Swing motor
4 Travel motor
5 RCV lever(LH)
6 RCV lever(RH)
7 RCV pedal
8 Boom cylinder(LH)
9 Boom cylinder(RH)
10 Arm cylinder
11 Bucket cylinder
12 Turning joint

37 Stop valve(Option)
40 Selector valve(Option)
41 Solenoid valve(Option)
35
36 Accumulator(Option)
37 Stop valve(Option)
40 Selector valve(Option)
41 Solenoid valve(Option)
43 Breaker return filter(Option)
44 EPPR valve(Option)
48
49
43 Breaker return filter(Option)
44 EPPR valve(Option)
Pattern chan
ge valve(Option)
Solenoid valve(Option)
26,27
28
13
14
16
29
20
19
18
15
17
44
21

A(ccw)
PG
3
PO
3-1
48093HC01