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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-13
Group 5 Combined Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-23
 SECTION 3 HYDRAULIC SYSTEM
GROUP 1 HYDRAULIC CIRCUIT
3 42 40 10 11 8 9
SH DR4 31
39 41
41
B
Pn2 Rs Pn1 2
PG
C
DB
R/PIPE "R4" C6 44 30 30
D6 43 E
Pc6
PA PB 45
C 25
Pd6 Pi1
DR5
37 V2
B5
C5 37 A5 33 32
Pb5 dr7
D5 Pc5
A(cw) B(ccw)

11 Main
Main pump
Pd5 Pa5
pump
22 Main
Main control
control valve
valve
4 C4
33 Swing
Swing motor
motor
L/H RED RED R/H D4 DR3
B4 44 Travel
Travelmotor
motor
D2 D2 35 36 Pc40
Pc41 Pb4 55 RCV
RCV lever(LH)
lever(LH)
D1
66 RCV
RCV lever(RH)
D1 Pa4
P1 P2 P2 P1 Pd40 lever(RH)
P3 P P P3
Pc42 77 RCV
RCV pedal
pedal
V3 88 Boom
Boom cylinder(LH)
cylinder(LH)
Pc3
Pb3 99 Boom
Boom cylinder(RH)
cylinder(RH)
Backward

Backward

DR2
1010 Arm
Arm cylinder
Forward

Forward

Pa21 Pd41 cylinder

1111 Bucket
Bucket cylinder
cylinder
C2
B2 1212 Turning
Turningjointjoint
B A B A D2
Pb21 A2
1313 Check
Check valve
valve
1414 Check
Check valve
DR1
Pc2 Pb20 valve
Pd2 Pa20
1515 Hydraulic
Hydraulic tank tank
12 E 1616 Oil
Oilcooler
cooler
F C1
P Dr
D
B
B1
1717 Air
Airbreather
breather
D1 Pc1 Pb1 A1
C
A Pd1 Pa1 1818 Bypass
Bypass valvevalve
25
Pk
S/Motor"DB" 1919 Strainer
Strainer
38 DR0 25 2020 Spin
Spin filter
filter
P0 2121 Line filter
Line filter
Ai T1
24
2222 Solenoid
Solenoid valvevalve
P1 P2 Pz 2323 Accumulator(Option)
Accumulator(option)
2424 Pressure
Pressure switch
switch
Pd6 Pc6 27 2525 Pressure
Pressure switch(Option)
switch(option)
5 6 2626 Terminal
Terminal
SWING ARM BUCKET BOOM 7 TRAVEL 34 DOZER 2727 Last
Last guard
guard filter
filter
3030 Boom
Boom safety
safety valve(Option)
valve(option)
3131 Arm safety
Arm safety valve(Option)
valve(option)
27 3232 Pressure switch(Option)
Pressure switch(option)
(1) (3) (2) (4) (3) (1) (2) (4)
(1) (2) 13 a1 A1 A2 a2 1 3333 Shut off
Shut off valve(Option)
valve(option)
SH
Pd5 Pc5 Dr#, T
14 3434 RCV lever(Dozer,
RCV lever(Dozer, option)
option)
(2) (1) (4) (3) 27 3535 Dozer cylinder(LH,
cylinder(LH, option)
option)
Pb1 Pa1 Pc1 Pd1 16 Dozer
26 B A D E G F H J
3636 Dozer cylinder(RH,
Dozer cylinder(RH, option)
option)
Pc2 Pd2 Pd40 Pc40 Pa5 Pb5 Pa20 Pb20
17
MCV "Pn2"
Pi1 Pi2
MCV "Pn1" 3737 Port relief valve(option)
Port relief valve(Option)
Pm1 Pm2
MCV T/Joint PUMP PUMP MCV 23 3838 Breaker pedal(Option)
Breaker pedal(option)
18 15
P1
22 "Pb4" "Pk" "Pm1" "Pm2" "Pz"
20 3939 Accumulator(option)
Accumulator(Option)
A5 A4 A3 A2 A1
4040 Accumulator(option)
Accumulator(Option)
P4 S/Motor "PG"
ENG
19 Dr a3 4141 Stop valve(Option)
Stop valve(option)
P3 MCV "P0"
P2 B1 B3 A3 4242 2 way selector valve(Option)
2 way selector valve(option)
R/PIPE T 21 4343 Port relief valve(option)
"R10" P1 Port relief valve(Option)
4444 Port relief
Port relief valve(Option)
valve(option)
1607A3HC01
4545 2 way shuttle valve(option)
2 way shuttle valve(Option)

3-1