SECTION 3 HYDRAULIC SYSTEM

GROUP 1 HYDRAULIC CIRCUIT

DOZER ARM (OPTION) BUCKET BOOM BOOM SWING QUICK CLAMP
39
TRAVEL MOTOR
REAR AXLE FRONT AXLE
4 X G2
22 10 11 9 53
A(REV) 55
BL BR
32 S
35 33 34 55
D 230K
23 P2
P1

P1 B (FOR) C2 C1
P2 P2 9K
A
B C Y P
G1 T
B A B A 58
3 sh T P
1 Main pump
pg 2 Main control valve
Dr
(2)
3 Swing motor
4 Travel motor
5 RCV lever(LH)
6 RCV lever(RH)
7 RCV pedal
12 J K L E D C B A P G M F I H B(RH) Mu A(LH)
8 RCV dozer
9 Boom cylinder
PR BREAKER 10 Arm cylinder
37 40 28 11 Bucket cylinder
SELECTOR VLV
36 41 RL 12 Turning joint
S2 C D
L R 38 52 13 Check valve
S3 B A
14 Check valve
PS

180K
P PS
T P 15 Hydraulic tank
43 44
PS
b6 b5 16 Oil cooler
T 17 Air breather
A10 B10 xb9 A9 B9 A8 B8 P1 P2 A6
24 B4
A5 A4 P3 A2 B2 B1 18 Bypass valve
B7 A7 B6 B5 A1
dr
S1 b11 b10 Dr b9 b8 b7 AM1 BM2 b4
OP
b2 b1 18 Return element
AM2 BK BM1 DOZ SW
56 EF 19 Suction strainer
30 140K 20 Pilot filter
31
21 Solenoid valve
P 22 Dozer cylinder
26 DOZER RCV 26 T2 23 Check valve
PEDAL
8 P 54 24 Check valve
T T P 42
PS 25 Terminal
AI
26 Last guard filter
a4
27 Shuttle valve
b2 a2 b4
Pp
28 Stop valve
5 26 6 26 7 26 29 Selector valve
SWING P T ARM BUCKET P T BOOM TRAVEL T a11 a10 a8 a7 a6 a5 a4 T1 Sa a2 a1 30 Priority valve
2 31 Steering valve
a9
32 Locking valve
Gauge Dr
(3) (2) (4) (3) (1) (2) (4) A P
33 Gear box
(1)
a7
a8
b7 34 Front axle
b8
A B
51 35 Rear axle
sh PILOT PUMP 36 Cut off vlave
MAIN PUMP 37 Accumulator
A B D E H J F G R1 A1 A2 A3 A4
P T
1 38 Solenoid valve
25 a1 b1 a6
a11
b6
b11
a10 b10 a9 b9
xb9 13 39 Oacillating cylinder
27 14
16 40 Brake valve
56 42 41 Pressure switch
T/JOINT PR T/JOINT RL
17 42 Pressure sensor
PS

MCV b5
ACC
15 43 Pressure sensor
21 A1
SAFETY V/V
A2 A3 A4
18 44 Pressure sensor
Pp(MCV)
AXLE PARK BREAKER RAM LOCK 19
51 Solenoid valve
pg(S/Motor)
52 Selector valve
S1
P1 53 Boom swing cylinder
20 T
54 2 Way padal
55 Variable orifice
56 Accumulator
55W93HC01 58 Solenoid valve

3-1