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 -------------------------------------------------------------------------------------------- 3-10
Group 5 Combined Operation ------------------------------------------------------------------------------------- 3-22
 SECTION 3 HYDRAULIC SYSTEM
GROUP 1 HYDRAULIC CIRCUIT
4 R/H L/H
4
RED RED
3
PP
DR
RED

PP PP

9 10 11 12 13

B(BW)
20
B(FW) A(BW) DR1
DR2 DR1 A(FW)
DR2

B(CCW) T A(CW)

25 20

Pa8
23 24
Pa10 Pb8' Dr2 Pa7 P1 P2 Pa6 Pa5 Pa4 Dr1 P3 Pa3 TRAVEL DOZER
Pa2 Pa1

B3

B2
B5
B8
B10

A6

B6

A2
R/H
B7

A7

B1
A10

A5

A4

B4
A9

A3

A1
L/H DOWN UP
2 1 4 3 1 2

Pb6 Pa6 Pa7 Pb1 Pa1

Pb7

1 MAIN PUMP
2 MAIN CONTROL VALVE
3 SWING MOTOR
4 TRAVEL MOTOR
5 RCV LEVER-LH
T2 T1 6 RCV LEVER-RH
Pb7
Pb10 Dr1 Pb6 Pb5 Pb4 Pb3 Pb2 Pb1 7 SOLENOID VALVE
Pp1
8 TURNING JOINT
BU
Pb8 9 BUCKET CYLINDER
10 BOOM CYLINDER
11 DOZER CYLINDER
12 ARM CYLINDER
13 BOOM SWING CYLINDER
21
5 6 14 LINE FILTER
22 22
ACC B/SWING 2WAY OPTION SWING ARM BUCKET BOOM 15 OIL COOLER
A1 A2
LH RH LH RH OUT IN IN OUT UP DOWN
1 A1 A2 A3 A4 16 RETURN CHECK VALVE
7 1 2 1 2 1 3 2 4 3 1 2 4 16 15 17 RETURN FILTER
18 SUCTION STRAINER
P2
19 HYD TANK
20 STOP VALVE
P1
Pa2 Pb2 Pa4 Pb4 Pb3 Pa3 Pb5 Pb10 Pa10 Pb8 21 ACCUMULATOR
Pa8 19 22 RCV PEDAL
T
Pa5 17 23 RCV PEDAL
S1
24 RCV DOZER
18 25 3 WAY VALVE
14
R27Z93HC01

3-1