Sơ đồ thủy lực máy đào caterpillar

SENR5457
20 Page
©
1992 Caterpillar
All Rights Reserved
Printed in U.S.A.
SENR5457
November 1992
320 and 320 L Excavators
Hydraulic System
320:
2DL1-UP
3RK1-UP
7WK1-UP
320 L:
1TL1-UP
4BK1-UP
9KK1-UP
SENR5457
20 Page
JR1
JR3
JR2
JR4
JRT
JRP
JL4
JL2
JL1
JL3
JLTJLP

Pp3
Pp3
T T
A
B
B
A
AR1
BR1
ST
AL2BL2
X
DR
R2
HL
dL5
aL5
aL4
AL3BL3
aL3
aL2
AL1
BL1
aL1
PSW
aR1
aR2
AR2
BR2
aR3

dR4
Y
HR
AR4
R1
dSW
bR2
bR1
dST1
PL
PR
PP
bL1
PAT
bL2 bL3
PiB
bL4
PiL
bR3aR4
SA5
SA4
SA3
SA2
SA1
SB5 SB4
SB3
SB2
SB1
SP
(F)

BP1
BT
BPi
BP3
(B)
AL4
J
R1
S
R2
X1
X2
X3
M3
A1
M1
A2
M2
R1
A3
AP2
DR2
PAC
PSA
DR3
Pi3
DR1
TOUT
PG
PG

PIN
JPi
Pi5
Pi8
C/V
PEU
DR4
DR5
Pi2
Pi1
DR6
R3
R4
R3
AR3
AP1
PTA
AT
MU
DR
TT
A
B
TP
TLA2
BDr
TLA1
TRA1
PSL
APi

TRA2
BL4
BR3
ADr
BP2
Hydraulic Schematic
151-9749
MAIN CONNNECTOR LINE
PILOT LINE
DRAIN LINE
1
2
3
4
5
6
7
8
9
10
11
12
13
15
16
17
18
19
20
21

22
23
24
27
26
25
37
38
28
29
30
31
14
39
40
41
42
43
44
45
46
47
48
51
49
50
32
33
34
e96879

RENR3819-07
16 Page, B/W
RENR3819-07
August 2005
320C Excavators
Hydraulic System
BEA1-UP
FBA1-UP
GAA1-UP
GHA1-UP
GLA1-UP
MAA1-UP
PAA1-UP
ANB1-UP
BCB1-UP
BDB1-UP
MAB1-UP
PAB1-UP
AMC1-UP
BBC1-UP
BDC1-UP
FBC1-UP
GAC1-UP
HBC1-UP
CCD1-UP
BDE1-UP
ALF1-UP
BEF1-UP
DBG1-UP
EAG1-UP

GNG1-UP
JTG1-UP
AKH1-UP
AXK1-UP
BBL1-UP
EGL1-UP
BCN1-UP
SBN1-UP
BER1-UP
BPR1-UP
HKT1-UP
RAW1-UP
BRX1-UP
BMZ1-UP
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
Pi4
HR
R3
HL
Pi2Pi1
AR5
aR5 aR4 aR3 aR2 aR1 aL1 aL2 aL3 aL4
AR4 AR3 AR2
AR1
Pi4
AL1
AL2

AL3
AL4
BR5 BR4 BR3 BR2 BR1 BL1 BL2 BL3 R2 Pi3
bR5 bR4 bR3 bR2
bR1 DST
bL1 bL2
bL3 bL4
P1
P2
PIN
PSA2
PSA1
PAC
T-OUT(2)
DR2
RD3
RD4
Pi2
DR5
T-OUT(1)
DRG
45
46
48
47
23 22 21 20 19
18
16 15 1314
10
MAIN CONTROL VALVE

41
PILOT OIL MANIFOLD
f04860
17
30
ONE POSITION
TWO POSITION
THREE POSITION
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
LINES CROSSING
LINES JOINING
TWO-WAY
THREE-WAY
FOUR-WAY
SPRING
CONTROL VALVES
RESTRICTION
LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABLILTY
LINE RESTRICTION
(VARIABLE)

LINE RESTRICTION
(VARIABLE and PRESSURE COMPENSATED)
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER
PEDAL
GENERAL MANUAL
PUSH BUTTON
SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES

VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and

PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC SYMBOL
SPRING LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT

AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
RENR3819-07
16 Page, B/W
Hydr aulic Schematic
PILOT LINE
DRAIN LINE
IN
T
OUT
BDr
Pi2
(LOCK)
Pi
Dr1
A3
M1
M2
A1
A2
NO3
TOUT1
PIN
PAC
Pi1
P2
P1

PSA2
DR6
DR5
PSA1
DR4
DR3
DR2
DR1
BP1
BT
BA
T
(LOWER)
DR
RR
FR
U
(OUT)
(IN)
T
S1
G
F
S3
Pn1
PsM2
Ps1
PsM1
(RAISE)
(REV)

(FWD)
(R)
(OPEN)
(CLOSE)
(L)
(FWD)
(REV)
(TRAVEL)
T
P1P2
B2
A2 B1
B8B7B6C
B5
B4B3B2
B1
A8A7A6A5
A4
Pn2
A3
A2
A1
E
D
C
B
G3
SDr
PD6
ST

G4
DB6
Pm
PB2
SP1
A
SP2
Pi3 Di3
DST
(IN)
PRPL
(OUT)
AR4
R1BR4
AR3BR3
AR2
BR2
Dr2
Ps2
SPi
SP3
(RAISE)
AR1
BR1
BR5
Di4
Pi4
AL1
bL3
AR5

G2
G1
AL4
DB2
BL1
CLOSE
AL2
OPEN
AB
DB1
A1
R3
BL2
BPi
AL3
PB1
DOWN
R2
BP3
L
R
BP2
bR4
aR5
Pi1
aR4
bR5
HR
Di1
aR3

bR3
aR2
bR2
aR1
bR1
aL1
bL1
HL
aL2
bL2
bL4
Pi2
aL4
Di2
IN
UP
Pp3Pp3
OUT
NO1
TOUT2
(SW
PAR KING )
BL3
aL3
MU
DR
AB
PG
158-8176
12 3

4
5 67 8
9
11
1
Item
Component
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Component
No.
Item
No.

21
22
23
COMPONENTS
Swing Motor
Left Travel Motor
Right Travel Motor
Bucket Cylinder
Swivel
Stick Drift Reduction Valve
Swing Control Valve
Right Travel Control Valve
Attachment Control Valve
Bucket Control Valve
Line Relief Valve (Stick Cylinder Head End)
Straight Travel Control Valve
24
25
26
27
28
29
30
Stick Unloading Valve
Main Relief Valve
Stick Cylinder
Boom Cylinder
Boom II Control Valve
Stick I Control Valve
Left Travel Control Valve

Straight Travel Control Solenoid
Stick Regeneration Valve
Negative Flow Control Relief Valve
Boom I Control Valve
Boom Drift Reduction Valve
Main Control Valve
Stick II Control Valve
Line Relief Valve (Bucket Cylinder Rod End)
Line Relief Valve (Bucket Cylinder Head End)
Boom Regeneration Valve
Pressur e Switch
Pressur e Switch
Pilot Control Valve (Swing and Stick)
Pilot Control Valve (Boom and Bucket)
Pressur e Switch
Accumulator
Reducing Valve (Boom/Swing Priority Mode)
Pressur e Sensor (Left Pump)
Travel Speed Solenoid Valve
34
35
32
33
31
38
39
40
41
42
43

44
45
46
47
48
49
50
51
52
37
36
53
54
55
56
57
58
59
Valve
Left Pump
Pilot Pump
Slow Return Check Valve
Bypass Check Valve
Return Filter
Right Pump
Pilot Relief Valve
Pilot Filter
Pressur e Sensor (Right Pump)
60
Oil Cooler

Pilot Control Valve (Travel)
Negative Flow Control Relief Valve
Travel Brake Valve (Left)
Travel Brake Valve (Right)
Line Relief Valve (Boom Cylinder Rod End)
Swing Parking Brake Solenoid Valve
Solenoid Valve (Hydraulic Activation)
Pilot Oil Manifold
10
12
13 14 15
16
18
19 20
21
22 23
24
25
17
28
30
26
27
29
31 32
33
34
35
36 37
38

39
40
41 42
43
44
45
46 47 48
49
50
51
52
53
55
56
57
58
59
60
54
Variable Swing Priority Valve
Hydraulic Tank
Case Drain Filter
7
4
8
9
55
5610
1535859574950543625
f04859

MAIN CONNECTOR LINE
RENR7296-01
16 Page
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
Harness identification code
This example indicates
wire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number
Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example
Hydraulic Schematic Example
325-PK
Wire Color
Circuit Number
Identification
B
A
Wire

Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
ONE POSITION
TWO POSITION
THREE POSITION
VENTED
PRESSURIZED

RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
LINES CROSSING
LINES JOINING
TWO-WAY
THREE-WAY
FOUR-WAY
SPRING
CONTROL VALVES
RESTRICTION
LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABILITY
LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
VARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT

PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES

PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED

CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
T
RENR7296-02

March 2007
320D & 320D L Excavator
Hydraulic System
320D:
MCH1-UP
FAL1-UP
CXY1-UP
JGZ1-UP
320D L:
MDE1-UP
KGF1-UP
DHK1-UP
PHX1-UP
©
2007 Caterpillar
All Rights Reserved
Printed in U.S.A.
MOTOR GP - PISTON (TRAVEL) FILTER GP
MOTOR GP - SWING & SWIVELVALVE GP - MAIN CONTROL
PUMP GP - PISTON (MAIN)
Machine Component Locations
Description
Part
Number
Machine
Location
Schematic
Location
ACCUMULATOR
164-6981

1 A-6
CYLINDER GP - BOOM NOTE A
NOTE A
NOTE A
NOTE A: CHECK PARTS MANUAL FOR YOUR MACHINE PART NUMBERS.
2 F-3
CYLINDER GP - BUCKET 3 F-3
G-10
CYLINDER GP - STICK
4
FILTER GP - OIL (CASE DRAIN) 126-2075
5
A-8
FILTER GP - OIL (PILOT) 158-8987
6
A-5
FILTER GP - OIL 188-4140
7
A-9
8MOTOR GP - SWING 158-8986
9
G-8
MOTOR GP - TRAVEL 209-5992
10
G-5, G-6
11
PUMP GP - PISTON (MAIN) 272-6955
234-4440
12
B-3

E-6SWIVEL
13
VALVE GP - TRAVEL COUNTERBALANCE 137-3718
14
F-5, F-6
VALVE GP - PILOT (TRAVEL) 270-5947
15
E-10
VALVE GP - SHUTTLE 185-0462
16
C-10
VALVE GP - CHECK 201-9329
17
A-10
VALVE GP - PILOT MANIFOLD 215-5037 18 B-8
VALVE GP - LOAD CONTROL (STICK) 255-5680
19
D-7
VALVE GP - LOAD CONTROL (BOOM) 255-5683
20
D-3
VALVE GP - MAIN CONTROL 259-7464
21
259-7732 B-522
VALVE GP - SWING CUSHION 158-9085 F-823
D-3
24
VALVE GP - PILOT CONTROL (LEFT JOYSTICK) 270-5951 D-10
VALVE GP - PILOT CONTROL (RIGHT JOYSTICK) 270-5952 D-9
VALVE GP - PRESSURE REDUCING (IMPLEMENT,

SWING PRIORITY)
232-4102 B-5
COMPONENT LOCATIONS
9
24
15
13
10
14
7
6
5
8
23
11
10
9 24
9 24
8 23
14
22
20
12
15
13
18
21
19
1716
11

3
4
5
2
7
1
6
RENR7296-01
16 Page, Color 2
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
IMPLEMENT & LEFT TRAVEL PUMP OUTPUT
IMPLEMENT & RIGHT TRAVEL PUMP OUTPUT
PILOT PUMP OUTPUT
ATTACHMENT CONTROL CIRCUIT
SUPPLY LINE
BUCKET CONTROL & BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL & RIGHT TRAVEL MOTOR CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CONTROL & STICK CYLINDER CIRCUIT
SHUTTLE VALVE CONTROL CIRCUIT
COMBINED LEFT & RIGHT PUMP SIGNAL PRESSURE
BOOM CONTROL & BOOM CYLINDER CIRCUIT
LEFT TRAVEL CONTROL & LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL & SWING MOTOR CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line

Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling, Sensor) by letter
Components by number
Connections by letter
YY
1
AA
THIS SCHEMATIC IS FOR THE 320D AND 320D L EXCAVATOR
PART #: 259-7469 HE01
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
A
B
C
D
E
F
G
12345678910
12345678910
A
B
C
D
E
F
G

aR3
RCV-C
RCV-B
RCV-A
aR4 bR3 bR4 bL3 bL2 bL4 aL2
bL4
bL3 bL2
bL1 bR1 bR3
bR4
bR1 aR1
aL1 bL1
aR3
aR4
aR1
aL1aL2
AL3 BL3
AL2BL2
BR1
BL1 AL1
AR1
AR3 BR3 AR4 BR4
BR3 AR3
AR4
BR4
BR1
AR1
AL1
AL2
AL3
BL3

BL2
BL1
TRAVEL(L)
TRAVEL(R)
VALVE GP
PILOT (TRAVEL)
270-5947
T1
T5
BACK
FWD
BACK
FWD
T2
T4
T6
T3
JLP
JLT
STICK
SWING
OUT
JL1
IN
JL3
R
L
JL2
JL4
BUCKET

BOOM
OPEN
CLOSE
DOWN
UP
JR1
JR2
JR3
JR4
A1
A2 A3 A4 A5 A6 A7 A8
B1 B2
B3
B4
B5
B6
B7
B8
STICK CYLINDER
P2 Pi1 DR1
DR2
DR3 DR4 DR5 DR6
P-IN PSA1
PAC
PSA2
T-OUT1
T-OUT2
Pi2
A
C

B
D
E
F
G
VALVE GP
CHECK
201-9329
FILTER GP
OIL
188-4140
FILTER GP
OIL
(CASE DRAIN)
126-2075
VALVE GP
SHUTTLE
185-0462
VALVE GP
PILOT MANIFOLD
215-5037
JRT
VALVE GP
PILOT CONTROL
(LEFT JOYSTICK)
270-5951
VALVE GP
PILOT CONTROL
(RIGHT JOYSTICK)
270-5952

ACCUMULATOR GP
164-6981
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)
Pp3
BG
Pp3
BG
T1
T2
T1
T2
AG AG
A
B
A
B
BUCKET CYLINDER BOOM CYLINDER
M2
G2
G1
M1
A3
A1
S1

S3
A2
Pm
Pi
Pn1
Pn2
Ps2
Ps1
PsM1
Dr1
Dr2
DrM
PsM2
HL Di2
STICK(2)
BOOM(1)
ATCH
BUCKET
TRAVEL(R)
TRAVEL(L)
SWING
STICK(1)
BOOM(2)
Pi2 Pi3 Di3 DST PL PR bR2 Di1 HR
AL4
SEE LOC
A-10
SEE LOC
A-10
aL4

SPi
SDr
SP3
Di4
Pi4
Pi1
BP3 BDr BPi
R3aR5
AR5
BOOM DRIFT REDUCTION
BR5
BTBP1
AR2BR2
aR2
(UP)
(OUT)
(IN)
(R)
(L)
(FWD)
(REV)
(FWD)
(REV)
(OPEN)
(CLOSE)
(UP)
(DOWN)
(OUT)
PG
DR

MU
BG AG
AB
SWING MOTOR
P1
P2
T
A1 A2B1 B2
aL3
MOTOR GP
SWING
158-8986
VALVE GP
SWING CUSHION
158-9085
MOTOR GP
TRAVEL
209-5992
VALVE GP
TRAVEL
COUNTERBALANCE
137-3718
MOTOR GP
TRAVEL
209-5992
VALVE GP
TRAVEL COUNTERBALANCE
137-3718
SWIVEL GP
234-4440

VALVE GP
LOAD CONTROL
(BOOM)
255-5683
VALVE GP
LOAD CONTROL (STICK)
255-5680
VALVE GP
MAIN CONTROL
259-7464
PUMP GP
PISTON (MAIN)
272-6955
RCV: RETURN CHECK VALVE
FILTER GP
OIL (PILOT)
158-8987
bR5
INOUT
T
DR
A1
B1
PG
U
FRRR
VALVE GP
PRESSURE
REDUCING
(IMPLEMENT,

SWING
PRIORITY)
232-4102
VALVE GP
SHUTTLE
259-7732
PC
P1
JRP
T
BP2


PILOT
I
D
TRAVEL BRAKETRAVEL BRAKE
PRESSURE SWITCH PRESSURE SWITCH
PRESSURE SWITCH
SLOW RETURN BYPASS
OIL COOLER
RETURN
DRAIN
TRAVEL SPEED SWING
PRIORITY


PRESSURE SENSOR
PROPORTIONAL
REDUCING VALVE

MAIN
RELIEF
PRESSURE SENSOR
STICK DRIFT REDUCTION
RCV-C
RCV-A
RCV-B
SEE LOC
A-10
SEE LOC
E-2
SEE LOC
G-9
SEE LOC
E-8
HL
HR
PL
PL
PR
PR
HL
HR
©
2002 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR3110-02
April 2002
365B Excavator

Hydraulic System
365B L:
AGD1-235
9PZ1-474
9TZ1-530
4XZ1-339
14
15
16 54
55
21
41
42
22
18
19
20
61
35
37
39
40
57
63
62
6059
58
24
46
45

43
41
55
52
5048
49
32
30
28
27
25
26
Main Control Valve
17
f00914
Pilot Manifold
PIN
Pi3
Pi2
Pi1
PSA3
PSA2
PSA1
PSA
4
DR3
DR2 DR1
TOUT
PG
Pi6

Pi5
Pi4
DR6
DR5
DR4
PAC
f00915
70
71
75
76
72
P
P
R
T1
L'
L'
B' A'
BR
BR
MB
MA
M
MB
A'B'
LEFT
PR
PG
E

F
L2
D
L1
Qmax Qmin
T1
A'
D
F
E
P
T
M2
M1
B'
B
P1
P2
Dr
REV
FWD FWD
A
T2
T2
(PS)
REV
BL2
AL2
B
LL1S

PSA3
PSA2
PSA1
PG
PIN
TOUT
DR1
DR2
DR3
Pi5
PAC
Pi3
Pi2
Pi1
Pi4
Pi6
M1
T2T1
R
S
AS
PSA4
DR6
M
G
aR3
aL3
bR3
bL3
aL1

aR1
bL4
aL4
bR1
PF
PR
bL1
R1
D1
D2
R2
AL4
BR1
R2
AR1
BL1
AL1
AR3
BR3
AL3
BL3
RIGHT
S1
DR5
BL4
dR1
bL2
QmaxQmin
B
M2

M2g
A
LS2
LS2g
PS2g
PS2
M2g'M1g'
PS1g
PS1
aL2
R1
UP
DR4
LS1g
LS1
SA1
M1g
M1
P2
P1
)(
)(
M
MA
QminQmax
B
A
CLOSE
PD
P1

P2
Dr
X
DOWN
OPEN
SA2
OUT
IN
MAIN CONNNECTOR LINE
PILOT LINE
DRAIN LINE
Hydraulic Schematic
140-0690
1
2
3
4
5
6
7
9
8
13
14 15 16 17
18
19
21
22
23 24
25

26
27
28
29 30 31 32 33 34 35 36 37 38 39 40
42
43 44 45
46
47
48 49 50 51 52 53 54
55
56 57 58 59 60 61 62 63
64
65
66 67 68 69
70 71 72
73
74
75
76
41
20
10
77
78 79 80
81
82
83
84
85
86

87 88
2
3
1
7
11
54
858483
86
81
888786
82
80
13
Item
Component
STANDARD COMPONENTS
Component
No.
Item
No.
1
2
3
4
5
6
7
8
9

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Drain Filter
30
31
32
33
34
35
36
37
38

39
40
41
42
44
43
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68

69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
Bucket Cylinder
Stick Cylinder
Boom Cylinder
Travel Motor (Right)
Travel Brake Valve (Right)
Travel Motor (Left)
Swing Motor (Right)
Travel Brake Valve (Left)
Swing Control Valve
Swing Parking Brake Solenoid

Swing Motor (Left)
Cushion Crossover Relief Valve
Swivel
Attachment Spool Proportional Valve
Bucket Spool Proportional Valve (Close)
Boom Spool Proportional Valve (Close)
Main Control Valve
Stick Spool Proportional Valve (In)
Left Travel Spool Proportional Valve (Frwd)
Right Travel Spool Proportional Valve (Frwd)
Signal Duplication Valve (Boom Side)
Signal Bypass Valve
Signal Relief Valve (Travel)
Signal Duplication Valve (Stick Side)
Solenoid Valve (Neutral Bypass)
Neutral Flow Control Valve
Differential Pressure Relief Valve (Rear)
Flow Compensator Valve (Attachment)
Attachment Control Valve
Flow Compensator Valve (Bucket)
Bucket Control Valve
Flow Compensator Valve (Boom)
Boom Control Valve
Stick Control Valve
Flow Compensator Valve (Stick)
Left Travel Control Valve
Flow Compensator Valve (Left Travel)
Right Travel Control Valve
Flow Compensator Valve (Right Travel)
Differential Pressure Relief Valve (Front)

Signal Relief Valve (Boom Side)
Signal Relief Valve (Heavy Duty)
High/Low Relief Solenoid (Boom Side)
Signal Relief Valve (Travel)
Swing Pump
Cooling Pump
Pilot Pump
Rear Pump
Charged Pump
Front Pump
Drain Filter
Oil Cooler
Hydraulic Tank
Return Filter
Swing Pump Pressure Sensor
Accumulator
Hydraulic Activation Valve
Valve
Pilot Relief Valve
Pilot Oil Manifold
Proportional Reducing Valve
Travel Speed Solenoid Valve
Front Pump Pressure Sensor
Cooling Fan Motor
Back Pressure Valve
Return Filter
Bypass Check Valve
Pilot Filter
Right Travel Spool Proportional Valve (REV)
Left Travel Spool Proportional Valve (REV)

Line Relief Valve (Stick Cylinder Rod End)
Stick Spool Proportional Valve (Out)
Stick Drift Reduction Valve
Line Relief Valve (Stick Cylinder Head End)
Stick Drift Reduction Solenoid
Line Relief Valve (Boom Cylinder Head End)
Boom Drift Reduction Valve
Boom Drift Reduction Solenoid
Line Relief Valve (Boom Cylinder Rod End)
Boom Spool Proportional Valve (Down)
Line Relief Valve (Bucket Cylinder Rod End)
Bucket Cylinder Proportional Valve (Open)
Line Relief Valve (Bucket Cylinder Rod End)
Attachment Spool Proportional Valve
Load Signal Control Valve
Signal Relief Valve (Stick Side)
High/Low Relief Solenoid (Stick Side)
f05416
12
11
RENR7306
20 Page, RBM
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR7306
January 2005
365C Excavator
Hydraulic System

ELC1-UP
MEM1-UP
FEN1-UP
MCS1-UP
MCY1-UP
ONE POSITION
TWO POSITION
THREE POSITION
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
LINES CROSSING
LINES JOINING
TWO-WAY
THREE-WAY
FOUR-WAY
SPRING
CONTROL VALVES
RESTRICTION
LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABILITY
LINE RESTRICTION
(VARIABLE)

LINE RESTRICTION
(VARIABLE and PRESSURE COMPENSATED)
PRESSURE
COMPENSATION
PUMP:VARIABLEand
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER
PEDAL
GENERAL MANUAL
PUSH BUTTON
SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES

VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and

PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC SYMBOL
SPRING LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT

AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
Harness identification code
This example indicates
wire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number
Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example
Hydraulic Schematic Example
325-PK
Wire Color
Circuit Number
Identification
B

A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
Description
Part

Number
Machine
Location
Schematic
Location
Accumulator GP 160-4138 8 G-10
Filter GP - Case Drain 6E-5534 1 A-14
Filter GP - Pilot 185-0336 9 B-15
Filter GP - Return 234-4454 17 B-14
Filter GP - Return 259-0681 22 A-15
Motor GP - Fan 225-4613 15 B-13
Motor GP - Swing, Left 234-4525 18 I-8
Motor GP - Swing, Right 234-4527 19 H-10
Motor GP - Travel, Lt and Rt 147-5784 5 H-11 and H-12
Pump GP - Fan 247-8968 21 B-9
Pump GP - Main, Front & Rear 225-4493 13 A-12
Pump GP - Swing 225-4495 14 B-8
Pump GP -Pilot 155-9222 6 A-10
Sensor GP - Pressure 221-8869 12 B-9 and B-12
Swivel GP 156-0622 7 G-11
Valve GP - Back Pressure 201-9381 10 D-7
Valve GP - Check, Bypass 201-9382 11 D-15
Valve GP - Counterbalance 143-8067 4 H-11 and H-12
Valve GP - Proportional 230-0081 16 F-7
Valve GP - Proportional, Swing 241-8928 20 H-10
Valve GP - Solenoid, Swing Park 140-0736 3 F-10
Valve GP - Swing 116-3420 2 H-8
Component Locations
Case Drain Filters (1).
Left Swing Motor (18).

Right Swing Motor (19).
Pilot Pump (6).
Main Pumps, Front and Rear (13).
Swing Pump (14).
Fan Pump (21).
Left Swing Motor (18).
Swing Park Brake Solenoid Valve (3).
Pilot Pump (6).
Left Travel Motor (5).
Counterbalance Valve (4).
1
14
6
7
18
19
5
13
5
2
Component Locations
RENR7306
20 Page, Color 2, RBM
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Pump Output (Main, Front and Rear)
Pump Output (Fan)
Swing Circuits
Supply Line
Drain / Return Line
Stick Circuit

Bucket Circuit
Pump Output (Pilot)
Boom Circuit
ATCH Circuit
Pump Output (Swing)
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Travel Circuits
THIS SCHEMATIC IS FOR THE 365C EXCAVATOR.
PART # 230-2751 CHG 3 HPC OFF, TRUE LOAD SIGNAL AND
PART # 239-8660 HPC ON, DUPLICATED LOAD SIGNAL.
Components are shown installed on a fully operable machine with the key and
engine off and transmission shifter in neutral.
A
B
C
D
E
F
G
H
A
B
C
D
E

F
G
H
15 13121110987654321
I I
14
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
X
Part #239-8660, HPC-ON, Duplicated Load Signal
Part #230-2751 CHG 03, HPC-OFF, True Load Signal
D1
PS2g
STICK CYLINDERBUCKET CYLINDER BOOM CYLINDER
SWING MOTOR - RIGHT SWING MOTOR - LEFT
LS2gLS2
PS2
M2
SA2
P2
M2g
M1g
P1
SA1
M1
LS1g
LS1
PS1
PS1g
R1
M1g'

S1
M2g' D2 R2
PR
PD
PG1
PG2
DB
PB
M
B
A
PA
M1 M2
SDr1
SP
T P SDr2
R
M
PA
PB
PG
DB
Pi6
Pi5
Pi4
Pi3
Pi2
Pi1
PSA4
PSA3

PSA2
PSA1
PAC
PG
DR1
DR2
DR3
DR4
DR5
DR6
PIN
TOUT
Qmax Qmin
AS
R
T1
T2
L1
L2
M1
S
DR
DR1
S
A
M
G
Qmax QminQmax Qmin
L2
L3

DR
DR1
A
B
AR3 BR3
BL4AL4BL3 AL3
PF
PR
BL1
AL1 AR1
BR1
BL3 AL3 AR3
BR3
PF
PR
AL4
BL4 BR1 AR1 BL1 AL1
FWD
FWD
IN
REV
REV
OUT
STICK
TRAVEL(L)
TRAVEL(R)
CLOSE
UP
OPEN
DOWN

BOOM
BUCKET
ATCH
LS
bL1bR1aL4
aL1aR1bL4
DR4DR5
R2
DR3
PS3
DR1
aR3aL3aL2
bR3bL3bL2
R1
DR2
PS2
DR4PS4
BL2 AL2
X
T1
T2
BG
B
A
AG
A
BBR
L
BR
A

B
T1
T2
BG
B
A
AG
LS2gLS2
PS2
PS2g
M2
SA2
P2
M2g
M1g
P1
SA1
M1
LS1g
LS1
PS1
PS1g
R1 D1 M1g' S1 M2g' D2 R2
Qmax QminQmax Qmin
PF
PR
PF
PR
LS
DR1

10
14
21
12
6
13
15
1
22
9
17
11
7
3
4
8
2
4
5
5
19
20
18
16
12
TRAVEL MOTOR - LEFT
TRAVEL MOTOR - RIGHT
©
2003 Caterpillar
All Rights Reserved

Printed in U.S.A.
RENR5406-02
February 2003
385B Excavator
Hydraulic System
MYA1-UP
BKF1-UP
ANS1-UP
BKX1-UP
BLY1-UP
RCD1-UP
PIN
Pi3
Pi2
Pi1
Pi6
Pi5
DR6
DR5
DR4
PAC
PSA3
PSA2
PSA1
PSA4
DR3
DR2
DR1
TOUT
PG

13
14
50
15
51
49
17
43
58
18
19
20
36
44
88
55
60
59
57
54
56
42
29
87
41
39
48
47
46
86

45
22
21
37
67
63
62
61
16
Main Control Valve
Pilot Oil Manifold
65
C
PR
PB
E
F
SWING
PR
A
Dr
B
Dr
Pi
Pi
Pa
Pb
D
LEFT
D

F
E
FWD FWD
TRACK
aL4
bR1
bL1
R2
A
B
TRAVEL
(L)
TRAVEL
(R)
Pa
Dr
C
FRONT
P
T
M2
M1
REAR
B
A
N
IN
L2
L1
Qmax Qmin

REV
M1
T2T1
R
S
A
M
G
aL1
BL1
AL1
LS2
B
L1
L
S
REV
aR1
bL4
D1
D2
AL4
BR1
AR1
PSga2a1
BL4
PF
PS1
STICK
LS1

SA1
P2
P1
)(
P1
P2
Dr
B1
SA2
OUT
RIGHT
P1
P2
Dr
BL2
AL2
PSA3
PSA2
PSA1
PG
PIN
TOUT
DR1
DR2
DR3
Pi5
PAC
Pi3
Pi2
Pi1

Pi4
Pi6
PSA4
DR6
aR3
aL3
bR3
bL3
ATT
AR3
BR3
AL3
BL3
DR5
bL2
PR
B
A
aL2
R1
BUCKET
UP
BOOM
DR4
Pb
Pi
Pi
)(
B
Dr

A
CLOSE
PR
DOWN
OPEN
N
P
PILOT LINE
DRAIN LINE
Hydraulic Schematic
158-8129
Item
Component
STANDARD COMPONENTS
Component
No.
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12

13
14
15
16
17
18
19
20
21
22
23
24
25
27
26
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

43
44
45
88
87
86
85
84
83
82
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65

66
67
68
69
70
71
72
73
74
75
76
77
78
79
81
80
Bucket Cylinder
Stick Cylinder
Boom Cylinders
Right Travel Motor
Left Travel Motor
Front Swing Motor
Swing Parking Brake Solenoid Valve
Rear Swing Motor
Travel Brake Valve (Right)
Travel Brake Valve (Left)
Swivel
Swing Control Valve
Proportional Valve (Attachment Spool)
Proportional Valve (Bucket Cylinder Rod End)

Proportional Valve (Boom Cylinder Rod End)
Main Control Valve
Signal Duplication Valve
Proportional Valve (Stick Cylinder Rod End)
Proportional Valve (Left Travel) (Forward)
Proportional Valve (Right Travel) (Forward)
Solenoid Valve (Neutral Bypass)
Differential Pressure Relief Valve (Rear Pump)
Attachment Control Valve
Flow Compensator Valve (Bucket)
Bucket Control Valve
Flow Compensator Valve (Boom)
Load Check Valve
Boom Control Valve
Signal Relief Valve (High Pressure)
Stick Control Valve
Flow Compensator Valve (Stick)
Left Travel Control Valve
Flow Compensator Valve (Left Travel)
Right Travel Control Valve
Flow Compensator Valve (Right Travel)
Defferential Pressure Relief Valve (Front Pump)
Neutral Flow Control Valve
Flow Compensator Valve (Attachment)
Line Relief Valve (Bucket Cylinder Rod End)
Line Relief Valve (Bucket Cylinder Head End)
Line Relief Valve (Boom Cylinder Rod End)
Signal Relief Valve (Low Pressure)
Return Port
Return Port

Solenoid Valve (High/Low Relief) Travel/Stick
Proportional Valve (Attachment Spool)
Proportional Valve (Bucket Cylinder Head End)
Proportional Valve (Boom Cylinder Head End)
Line Relief Valve (Boom Cylinder Head End)
Solenoid Valve (Boom Drift Reduction Valve)
Boom Drift Reduction Valve
Inlet Port (Front Pump Flow)
Inlet Port (Rear Pump Flow)
Stick Drift Reduction Valve
Solenoid Valve (Stick Drift Reduction Valve)
Line Relief Valve (Stick Cylinder Rod End)
Proportional Valve (Stick Cylinder Head End)
Line Relief Valve (Stick Cylinder Head End)
Proportional Valve (Left Travel) (Reverse)
Proportional Valve (Right Travel) (Reverse)
Travel Speed Solenoid Valve
Pilot Relief Valve
Valve
Pilot Oil Manifold
Accumulator
Solenoid Valve (Hydraulic Activation)
Pilot Filter
Bypass Check Valve
Back Pressure Valve
Radiator Fan Motor
Oil Cooler Fan Motor
Front Pump Pressure Sensor
Swing Pump Pressure Sensor
Drain Filter

Return Filter
Hydraulic Tank
Return Filter
Drain Filter
Front Pump
Charge Pump
Rear Pump
Pilot Pump
Cooling Pump
Swing Pump
Main Control Valve Body (Boom Side)
Center Manifold
Main Control Valve Body (Stick Side)
1
2
3
3
4
9
5
10
11
6
7 8
12
13
14
15
16
21

22
23
24
25
26
27
28
45
37
38
46
39
41
48
49
50
51
52
53
42
43
29
17
47
40
55
54
56
19 2018
30

31
32
33
34
35
36
44
60
59
57
58
61
62
63
64
65
66
67
68
69
70
75
76
78
71
72
79
77
80
81

82
73
83
84
85
74
P
Proportional Reducing Valve (PS Pressure)
2
1
3
6
72
71
11
7 8 12
82
4 9
81
80
5 10
83 84 85
MAIN CONNECTOR LINE
g00975646
RENR7376-00
20 Page, REM
6
9
24B
23

5A
5B
24A
1
1
1
3
4
1
4
16
1
8
Component Locations
RENR7376
January 2005
385C Front Shovel Excavator
Hydraulic System
MMA1-UP
T2F1-UP
EAM1-UP
GLT1-UP
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
Description
Part
Number
Machine

Location
Schematic
Location
Filter Gp. - Case Drain 6E-5534 1 A-14
Valve Gp. - Relief 116-3420 2 G-7
Valve Gp. - Hydraulic Activation 140-0736 3 F-10
Valve Gp. - Travel Brake (Left & Right) 155-9200 4 G-9,G-12
Pump Gp. - Front & Rear 155-9205 5 A-10,A-11
Pump Gp. - Pilot 155-9222 6 A-9
Swivel Gp. 156-0622 7 G-11
Accumulator Gp. 160-4138 8 G-9
Pump Gp. - Fan 170-9918 9 B-8
Valve Gp. - Check 173-3429 10 B-12
Filter Gp. - Pilot 185-0336 11 A-14
Valve Gp. - Check (Back Pressure) 201-9381 12 D-5
Valve Gp. - Check (Bypass) 201-9382 13 D-14
Motor Gp. - Travel (Left & Right) 209-5895 14 I-9,I-12
Motor Gp. - Fan 209-6058 15 B-13
Accumulator Gp. 215-4905 16 D-15
Sensor As. - Pressure 221-8869 17 B-11
Motor Gp. - Fan 225-4614 18 B-13
Filter Gp. - Return 234-4454 19 B-14
Motor Gp. - Swing (Front) 234-4535 20 I-7
Motor Gp. - Swing (Rear) 234-4537 21 I-8
Valve Gp. - Swing Control 241-8929 22 G-9
Pump Gp. - Swing 242-6923 23 B-8
Valve Gp. - Main Control 237-9147 24 F-6
Filter Gp. - Return 259-0681 25 A-14
Component Locations
ONE POSITION

TWO POSITION
THREE POSITION
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
LINES CROSSING
LINES JOINING
TWO-WAY
THREE-WAY
FOUR-WAY
SPRING
CONTROL VALVES
RESTRICTION
LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABILITY
LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
VARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and

PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT

NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING

BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT
AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF

SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
Harness identification code
This example indicates
wire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number
Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example
Hydraulic Schematic Example
325-PK
Wire Color
Circuit Number
Identification
B
A
Wire
Wire

(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
Main pump compartment - Pilot filter (11) and Case drain filter (1) for the front, rear, and swing pumps.
Left side wall of hydraulic tank. Case drain filter (1) for travel motors, swing motors, and other components.
Pilot oil manifold - Solenoid valve (hydraulic activation) (3).
The return accumulator (16) is located below the case drain filters.Pilot accumulator (8).
Left travel motor (14) and Travel brake valve (4).

Pump compartment - Front pump (5A), Rear pump (5B), Pilot pump (6), Fan pump (9), and
Swing pump (23).
Main conrol valve - Boom side (24A) and Stick side (24B).
3
11 19 25
1
2
20
8
4
4
14
14
2396
5
17
4
14
7
16
7
10
15
12
13 2418
21
22
RENR7376-00
20 Page, Color 2, REM
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

Pump Output (Main, Front and Rear)
Pump Output (Fan)
Supply Line
Drain / Return Line
Stick Circuit
Bucket Circuit
Pump Output (Pilot)
Boom Circuit
Front Shovel Circuit
Pump Output (Swing)
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Travel Circuits
I
15 14 13 12 11 987654
G
H
I
321
A
B
C
D
E
F
43211098765

A
B
C
15 13 12 1114
D
E
F
G
H
10
STICK CYLINDER
BUCKET CYLINDER
BOOM CYLINDER
TRAVEL MOTOR (LEFT)TRAVEL MOTOR (RIGHT)
SWING MOTOR (REAR) SWING MOTOR (FRONT)
MASTER CYLINDER BOTTOM DUMP
Pi6
Pi5
Pi4
Pi3
Pi2
Pi1
PSA4
PSA3
PSA2
PSA1
PAC
PG
DR1
DR2

DR3
DR4
DR5
DR6
PIN
TOUT
Qmax Qmin
AS R T1 T2
L1
L2
M1
SDRDR1S
A
MG
PS1
a1 P1 P2 a2
PSg
LS2
D2B1D1
LS1
AR3
BR3
AL4
BL4
BL3
AL3
PF
PR
BL1
AL1 AR1

BR1
BL3 AL3 AR3
BR3
PF
PR
AL4
BL4 BR1 AR1 BL1 AL1
L2
L3
DR
DR1
A
B
DR
DR1
L2
L3
B
A
BL2
AL2
BL2 AL2
FWD
FWD
IN
REV
REV
OUT
STICK
TRAVEL(L)

TRAVEL(R)
CLOSE
UP
OPEN
DOWN
BOOM
BUCKET
BOTTOM DUMP
LS
bL1bR1aL4
aL1aR1bL4
DR4DR5
R2
DR3
PS3
DR1
aR3aL3aL2
bR3bL3bL2
R1
DR2
PS2
DR4PS4
PR
PD
PG1
PG2
DB
PB
M
B

A
PA
M1 M2
SDr1
SP
T P SDr2
R
M
PA
PB
PG
DB
Pi
Dr
Dr
BG
B
A
AG
Pi
P
PG
B
A
Pi
Dr
Dr
BG
B
A

AG
Pi
PG
A
B
P
THIS SCHEMATIC IS FOR THE 385C FRONT SHOVEL
EXCAVATOR.
PART # 232-4127 CHG 01, HPC OFF, TRUE LOAD SIGNAL AND
PART # N/A, HPC ON, DUPLICATED LOAD SIGNAL.
Components are shown installed on a fully operable machine with the key and
engine off and transmission shifter in neutral.
12
23
9
17
6
5
10
18
1
25
11
19
13
7
3
4
8
2

4
14
21
22
20
24
17
(Alternate Connection for HPC-ON, Duplicated Load Signal)
Part# 232-4127 CHG 01, HPC-OFF, True Load Signal
PF
PR
LS
DR1
PS1
a1
P1
P2
a2
PSg
LS2
LS1
PF
PR
17
D2B1D1
14
15
16
5
RENR7366-00

20 Page, REM
6
9
24B
23
5A
5B
24A
1
1
1
3
4
1
4
16
1
8
RENR7366
January 2005
385C Excavator
Hydraulic System
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
EDA1-UP
KGB1-UP
KBC1-UP
SBE1-UP

T2E1-UP
KKK1-UP
JCM1-UP
MNZ1-UP
Description
Part
Number
Machine
Location
Schematic
Location
Filter Gp. - Case Drain 6E-5534 1 A-14
Valve Gp. - Relief 116-3420 2 G-7
Valve Gp. - Hydraulic Activation 140-0736 3 F-10
Valve Gp. - Travel Brake (Left & Right) 155-9200 4 G-9,G-12
Pump Gp. - Front & Rear 155-9205 5 A-10,A-11
Pump Gp. - Pilot 155-9222 6 A-9
Swivel Gp. 156-0622 7 G-11
Accumulator Gp. 160-4138 8 G-9
Pump Gp. - Fan 170-9918 9 B-8
Valve Gp. - Check 173-3429 10 B-12
Filter Gp. - Pilot 185-0336 11 A-14
Valve Gp. - Check (Back Pressure) 201-9381 12 D-5
Valve Gp. - Check (Bypass) 201-9382 13 D-14
Motor Gp. - Travel (Left & Right) 209-5895 14 I-9,I-12
Motor Gp. - Fan 209-6058 15 B-13
Accumulator Gp. 215-4905 16 D-15
Sensor As. - Pressure 221-8869 17 B-11
Motor Gp. - Fan 225-4614 18 B-13
Filter Gp. - Return 234-4454 19 B-14

Motor Gp. - Swing (Front) 234-4535 20 I-7
Motor Gp. - Swing (Rear) 234-4537 21 I-8
Valve Gp. - Swing Control 241-8929 22 G-9
Pump Gp. - Swing 242-6923 23 B-8
Valve Gp. - Main Control 230-0080 24 F-6
Filter Gp. - Return 259-0681 25 A-14
Component Locations
ONE POSITION
TWO POSITION
THREE POSITION
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
LINES CROSSING
LINES JOINING
TWO-WAY
THREE-WAY
FOUR-WAY
SPRING
CONTROL VALVES
RESTRICTION
LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABILITY

LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
VARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES

VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL

COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB

PT
AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
Harness identification code
This example indicates
wire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number
Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example
Hydraulic Schematic Example

325-PK
Wire Color
Circuit Number
Identification
B
A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol

Flow
Symbol
Electrical Symbols (Electrical)
Main pump compartment - Pilot filter (11) and Case drain filter (1) for the front, rear, and swing pumps.
Left side wall of hydraulic tank. Case drain filter (1) for travel motors, swing motors, and other components.
Pilot oil manifold - Solenoid valve (hydraulic activation) (3).
The return accumulator (16) is located below the case drain filters.Pilot accumulator (8).
Left travel motor (14) and Travel brake valve (4).
Pump compartment - Front pump (5A), Rear pump (5B), Pilot pump (6), Fan pump (9), and
Swing pump (23).
Main conrol valve - Boom side (24A) and Stick side (24B).
3
11 19 25
1
2
20
8
4
4
14
14
2396
5
17
4
14
7
16
7
10

15
12
13 2418
21
22
RENR7366-00
20 Page, Color 2, REM
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Pump Output (Main, Front and Rear)
Pump Output (Fan)
Supply Line
Drain / Return Line
Stick Circuit
Bucket Circuit
Pump Output (Pilot)
Boom Circuit
Attachment Circuit
Pump Output (Swing)
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Travel Circuits
I
15 14 13 12 11 987654
G
H
I

321
A
B
C
D
E
F
43211098765
A
B
C
15 13 12 1114
D
E
F
G
H
10
STICK CYLINDER
BUCKET CYLINDER
BOOM CYLINDER
TRAVEL MOTOR (LEFT)TRAVEL MOTOR (RIGHT)
SWING MOTOR (REAR) SWING MOTOR (FRONT)
Pi6
Pi5
Pi4
Pi3
Pi2
Pi1
PSA4

PSA3
PSA2
PSA1
PAC
PG
DR1
DR2
DR3
DR4
DR5
DR6
PIN
TOUT
Qmax Qmin
AS R T1 T2
L1
L2
M1
SDRDR1S
A
MG
PS1
a1 P1 P2 a2
PSg
LS2
D2B1D1
LS1
AR3
BR3
AL4

BL4
BL3
AL3
PF
PR
BL1
AL1 AR1
BR1
BL3 AL3 AR3
BR3
PF
PR
AL4
BL4 BR1 AR1 BL1 AL1
L2
L3
DR
DR1
A
B
DR
DR1
L2
L3
B
A
FWD
FWD
IN
REV

REV
OUT
STICK
TRAVEL(L)
TRAVEL(R)
CLOSE
UP
OPEN
DOWN
BOOM
BUCKET
ATCH
LS
bL1bR1aL4
aL1aR1bL4
DR4DR5
R2
DR3
PS3
DR1
aR3aL3aL2
bR3bL3bL2
R1
DR2
PS2
DR4PS4
PR
PD
PG1
PG2

DB
PB
M
B
A
PA
M1 M2
SDr1
SP
T P SDr2
R
M
PA
PB
PG
DB
Pi
Dr
Dr
BG
B
A
AG
Pi
P
PG
B
A
Pi
Dr

Dr
BG
B
A
AG
Pi
PG
A
B
P
THIS SCHEMATIC IS FOR THE 385C EXCAVATOR.
PART # 225-4836, CHG 03, HPC OFF, TRUE LOAD SIGNAL AND
PART # 225-4840, CHG 01, HPC ON, DUPLICATED LOAD SIGNAL.
Components are shown installed on a fully operable machine with the key and
engine off and transmission shifter in neutral.
12
23
9
17
6
5
10
18
1
25
11
19
13
7
3

4
8
2
4
14
21
22
20
24
17
(Alternate Connection for HPC-ON, Duplicated Load Signal)
Part# 232-4127 CHG 01, HPC-OFF, True Load Signal
PF
PR
LS
DR1
PS1
a1
P1
P2
a2
PSg
LS2
LS1
PF
PR
17
D2B1D1
14
15

16
5
BL2 AL2
MAIN CONNECTOR LINE
PILOT LINE
DRAIN LINE
d29548
HYDRAULIC SCHEMATIC
102-1098
©
2002 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR5328
April 2002
5090B Excavators
SJY1-UP
Hydraulic System
PIN
Pi3
Pi2
Pi1
Pi6
Pi5
DR6
DR5
DR4
PAC
PSA3
PSA2

PSA1
PSA4
DR3
DR2
DR1
TOUT
PG
67
Main Control Valve
Pilot Oil Manifold
f05439
18
47
88
24
23
32
16
52
49
53
51
19
35
59
20
21
22
42
88

56
61
60
58
55
57
33
34
50
46
64
63
65
69
17
15
44
RIGHT
C
PRPB
E
F
SWING
PR
A
Dr
B
Dr
Pi
Pi

Pa
Pb
L2
D
L1
Qmax Qmin
LEFT
D
F
E
P2
Dr
TRACK
BL2
AL2
PSA3
PSA2
PSA1
PG
PIN
TOUT
DR1
DR2
DR3
Pi5
PAC
Pi3
Pi2
Pi1
Pi4

Pi6
M1
T2T1
R
S
A
PSA4
DR6
M
G
aL3
bL3
PF
PR
D1
D2
AL4
BR1
R2
BOTTOM
DUMP
AR1
BL1
AL1
AR3AL3
PSga2a1
DR5
BL4
A
B

bL2
LS2
B
L1
PS1
B
A
L
R1
STICK
REV
FWD
BUCKET
FWD
S
REV
BOOM
TRAVEL
(L)
TRAVEL
(R)
aL1
aR1
DR4
bL4
LS1
aL4
SA1
P2
Pb

Pa
Pi
Pi
Dr
P1
)(
)(
C
bR1
bL1
OUT
IN
P1
aR3
aL3
bR3
bL3
BR3
BL3
aL2
UP
CLOSE
DOWNOPEN
FRONT
P
T
B
M2
Dr
A

P1
P2
M1
Dr
REAR
B
CLOSE
PR
B1
A
NN
SA2
OPEN
MAIN CONNNECTOR LINE
PILOT LINE
DRAIN LINE
Hydraulic Schematic
185-0379
P
P
Item
Component
STANDARD COMPONENTS
Component
No.
Item
No.
1
2
3

4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
27
26
28
29
30
31
32
33

34
35
36
37
38
39
40
41
42
43
44
45
88
87
86
85
84
83
82
46
47
48
49
50
51
52
53
54
55
56

57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
81
80
89
Master Cylinder
Bucket Cylinder
Bottom Dump Cylinders
Boom Cylinders

Right Travel Motor
Left Travel Motor
Front Swing Motor
Swing Parking Brake Solenoid Valve
Rear Swing Motor
Travel Brake Valve (Right)
Travel Brake Valve (Left)
Swivel
Swing Control Valve
Proportional Valve (Bottom Dump Spool)
Proportional Valve (Bucket Cylinder Rod End)
Proportional Valve (Boom Cylinder Rod End)
Main Control Valve
Signal Duplication Valve
Proportional Valve (Stick Cylinder Rod End)
Proportional Valve (Left Travel) (Forward)
Proportional Valve (Right Travel) (Forward)
Solenoid Valve (Neutral Bypass)
Differential Pressure Relief Valve (Rear Pump)
Flow Compensator Valve (Bottom Dump)
Bottom Dump Control Valve
Flow Compensator Valve (Bucket)
Bucket Control Valve
Flow Compensator Valve (Boom)
Load Check Valve
Boom Control Valve
Neurtal Flow Control Valve
Signal Relief Valve (Low Pressure)
Signal Relief Valve (High Pressure)
Stick Control Valve

Flow Compensator Valve (Stick)
Left Travel Control Valve
Flow Compensator Valve (Left Travel)
Right Travel Control Valve
Flow Compensator Valve (Right Travel)
Defferential Pressure Relief Valve (Front Pump)
Line Relief Valve (Bottom Dump Head End)
Proportional Valve (Bottom Dump Spool)
Line Relief Valve (Bottom Dump Rod End)
Line Relief Valve (Bucket Cylinder Rod End)
Proportional Valve (Bucket Cylinder Head End)
Line Relief Valve (Bucket Cylinder Head End)
Proportional Valve (Boom Cylinder Rod End)
Line Relief Valve (Boom Cylinder Rod End)
Line Relief Valve (Boom Cylinder Head End)
Solenoid Valve (Boom Drift Reduction Valve)
Boom Drift Reduction Valve
Inlet Port (Front Pump Flow)
Stick Drift Reduction Valve
Solenoid Valve (Stick Drift Reduction Valve)
Line Relief Valve (Stick Cylinder Rod End)
Proportional Valve (Stick Cylinder Head End)
Line Relief Valve (Stick Cylinder Head End)
Proportional Valve (Left Travel) (Reverse)
Proportional Valve (Right Travel) (Reverse)
Return Port
Travel Speed Solenoid Valve
Proportional Reducing Valve (PS Pressure)
Pilot Relief Valve
Valve

Solenoid Valve (Hydraulic Activation)
Accumulator
Pilot Oil Manifold
Pilot Filter
Drain Filter
Bypass Check Valve
Return Filter
Back Pressure Valve
Retrun Filter
Hydraulic Tank
Radiator Fan Motor
Oil Cooler Fan Motor
Drain Filter
Front Pump Pressure Sensor
Front Pump
Charge Pump
Rear Pump
Pilot Pump
Cooling Pump
Swing Pump
Swing Pump Pressure Sensor
Return Port
Inlet Port (Rear Pump Flow)
77
5
2
2
8
13
83

82
81
6 11
84 85 86
7 12
9 10
1
22
4
33
5
5
6
11
13
12
7
8
9
10
14
15
16
17
20
22
21
42
41
40

39
38
37
36
18
19
33
34
35
54
55
56
57
58
59
60
61
62
80
23
24
25
32
88
43
44
26
27
28
29

30
31
45
46
47
48
49
50
51
52
53
63
64
65
66
67
68
69
70
71
73
76
75
74
77
78
79
82
83
81

84
85
86
87
89
f05438
Stick Cylinder
Solenoid Valve (High/Low Relief)