SECTION 3 HYDRAULIC SYSTEM

Group 1 Hydraulic Circuit ----------------------------------------------------------------------------------------------- 3-1

Group 2 Main Circuit ------------------------------------------------------------------------------------------------------ 3-2
Group 3 Pilot Circuit ------------------------------------------------------------------------------------------------------- 3-5
Group 4 Single Operation ---------------------------------------------------------------------------------------------- 3-14
Group 5 Combined Operation --------------------------------------------------------------------------------------- 3-24
 SECTION 3 HYDRAULIC SYSTEM
GROUP 1 HYDRAULIC CIRCUIT

3 10 11 8 9
SH 36 40

PG
37 35 Pn2 Pn1
37 (Pi1, Pump) (Pi2, Pump)
Au B

C
PS 23 PS 23
GA GB CK1 Rs 2
Mu
Pcb

B(CW) A(CCW) Pc6

B5

A5
C5
D5
PC5 Pb5
32
4 L/H R/H Pd5 CK2
Pa5
RED RED DR5
D1 D2 D2 D1 P05
P04 1 Main pump
P1 P2 P2 P1 C4

P5 P5
2 Main control valve
P D4 B4
P
DR3 Pc41 3 Swing motor
Pb4 4 Travel motor
Pd40 Pa4
5 RCV lever(LH)
38 Pd5 PC40
A1
Pc42 6 RCV lever(RH)
7 RCV pedal
P3 P4 P4 P3 A2 PC3
Pb3
33 8 Boom cylinder(LH)
A B B A DR2
T
Pi
9 Boom cylinder(RH)
Pa21 42 10 Arm cylinder
P Pd41 P
A
A P B V3
B2
T 11 Bucket cylinder
C Dr D 12 C2
D2
A2
12 Turning joint
Pb21
Pk Pc2
Pd2 DR1
13 Check valve
Pb20
DR4 Pa20
14 Check valve
P02
15 Hydraulic tank
P03
PS 24 Patt
PS 24 16 Oil cooler
42 A1 A2 P2 A3 C1 B1
17 Air breather
26 D1 A1
P T Pc1 Pb1
40 18 Bypass valve
Pd1 Pa1
T
19 Strainer
20 Drain filter
P DR0 V1
Pd5 PC5
P01
21 Solenoid valve
24 PS
Ptr
22 Pressure sensor
5 6
SWING P T ARM BUCKET P T BOOM 7 26 P T TRAVEL 23 Pressure sensor
P1 P2 Pu T1
44 24 Pressure sensor
25 Terminal
(2) (1) (4) (3)
T B 26 Last guard filter
(1, A) (3, B) (2, D) (4, E) (3, F) (1, G) (2, H) (4, J)
Pa1 Pb1 Pd1 Pc1 P A 27 Last guard filter
a4 24
A1 Psv PS A2 28 Screw coupling
a1 a2 32 Shuttle valve
14 13 1 24 PS PS 24
DR#, dr# 33 Shuttle valve
a b d e f g h j
25 16 34 EPPR valve
24 c d1 h1 35 Accumulator
Pc2 Pd2 Pd40 Pa5 Pb5 PS
Pc40 Pa20 Pb20
36 Accumulator
34 27
39 27
Pc3 1
(MCV) PS 2 17 Pi2 37 Stop valve
(Pn1, MCV)
3 Pi1
38 Solenoid valve
(Pn2, MCV)
39 Shuttle valve
P03
(MCV)
Pb4
(MCV)
Pk
(T/Joint)
Pu
(MCV)
E a3 40 2-way pedal(option)
21 15 20
18 PG 28
A5 A4 A3 A2 A1 41 3-way joint
Dr B1 B3 Dr3 A3
P4
P01(MCV) 42 Pilot selector valve
19
P3
PG(S/Motor) 43 Solenoid valve
P2
44 Solenoid valve(option)
P1
T(dr1)

2609S3HC01P

3-1