Component Locations
KENR6122-05 June 2008
Part Machine Schematic Number Location Location
3
Quick Coupler Attachment
1
E-2
123-4750
2
B-2
Valve Gp - Shuttle (Quick Coupler)
123-2549
3
C-5
Valve Gp - Quick Coupler
254-3080
4
E-2
Valve Gp - Solenoid (Quick Coupler) 258-6749 Standard Machine
5
E-2
Accumulator Gp
Note B
20
A-4
Block
Note B
21
D-7
Cylinder Gp - Boom
Note A
22
E-6
Cylinder Gp - Bucket
Note A
23
E-7
Cylinder Gp - Stick
Note A
24
E-7
Filter Gp - Case Drain
Note B
25
A-6
MAIN AUX.
PUMP or MOTOR
32
26
A-3 A-6
Manifold Gp - Control
Note B
28
B-4 , B-5
Motor Gp - Swing
Note B
29
F-5
Motor Gp - Travel Left
Note B
30
F-4
Motor Gp - Travel Right
Note B
31
F-3
Pump GP - Main Hydraulic
Note B
32
B-2
Sensor As - Left Pump Pressure
Note B
33
B-3
Sensor As - Right Pump Pressure
Note B
34
A-3
Switch As - LH Travel Pressure
Note B
35
D-7
Switch As - Pilot Pressure
Note B
36
B-7
Switch As - RH Travel Pressure
Note B
37
D-6
Swivel Gp
Note B
38
E-4
Tank Gp - Hydraulic Oil
Note B
39
A-4
Valve Gp - Cooler Bypass
Note B
40
B-7
Valve Gp - Heavy Lift Solenoid
Note B
41
B-3
Valve Gp - LH Joystick
Note B
42
C-7
Valve Gp - Load Control Boom Cylinder
Note B
43
D-2
Valve Gp - Load Control Stick Cylinder
Note B
44
D-5
Valve Gp - Main Control
Note B
45
C-2 thru C-5
Valve Gp - Pilot Travel
Note B
46
D-6, D-7
Valve Gp - Press Reducing Boom/Swing
Note B
47
B-3
Valve Gp - Press Reducing Boom/Swing
Note B
48
B-4
Valve Gp - RH Joystick
Note B
49
C-6
Valve Gp - Shuttle
Note B
50
C-6, C-7
Valve Gp - Swing Cushion
Note B
51
E-5
Valve Gp - Travel LT Counterbalance
Note B
52
E-4
Valve Gp - Travel RT Counterbalance
Note B
53
E-3
45
38
Right Pump Delivery Pressure
A-2 A-3
HH
Left Pump Power Shift Pressure
B-2
JJ
Case Drain Pressure
B-2
KK
Right Pump Power Shift Pressure
A-2
LL
Quick Coupler Unlock Pressure
E-3
MM
Quick Coupler Lock Pressure
E-2
SOS
Hydraulic Oil Sampling Port
A-3
30 52
40
LL MM
5 32
2
EE
28
3
QUICK COUPLER CIRUIT LOCK SOLENOID
TRAVEL SPEED SOLENOID
SWING SOLENOID
4
320D, 321D, 323D, 324D, 325D and 330D Excavator Hydraulic System - Attachment 320D: A6F1-UP A8F1-UP A9F1-UP KGF1-UP MCH1-UP FAL1-UP WBN1-UP PHX1-UP
321D: PBD1-UP NAS1-UP
323D: RAC1-UP SDC1-UP WGC1-UP CYD1-UP SED1-UP YSD1-UP NDE1-UP JLG1-UP BYM1-UP PBM1-UP DKW1-UP SBZ1-UP
324D: EJC1-UP T2D1-UP JJG1-UP SYM1-UP
325D: GPB1-UP PKE1-UP LAL1-UP MCL1-UP AZP1-UP A3R1-UP GBR1-UP T2S1-UP CYW1-UP
330D: GBC1-UP GGE1-UP B6H1-UP THJ1-UP LRM1-UP ERN1-UP JLP1-UP MWP1-UP RAS1-UP EDX1-UP T2Y1-UP
42
21
RETURN ABOVE FLUID LEVEL
PRESSURIZED
PILOT CONTROLLED
RETURN BELOW FLUID LEVEL
MEASUREMENT
PRESSURE
ROTATING SHAFTS
FLOW
TEMPERATURE
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
SOLENOID or MANUAL
SOLENOID
SERVO
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
PUSH-PULL LEVER
GENERAL MANUAL
MANUAL SHUTOFF
EXTERNAL RETURN
PUSH BUTTON
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
SIMPLIFIED
ACCUMULATORS
SPRING LOADED
PEDAL
CROSSING AND JOINING LINES
LINES CROSSING
GAS CHARGED
VARIABLE DISPLACEMENT NON-COMPENSATED
FIXED DISPLACEMENT
HYDRAULIC AND PNEUMATIC CYLINDERS
LINES JOINING
SINGLE ACTING
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
DOUBLE ACTING
INTERNAL PASSAGEWAYS
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
COMPLETE
HYDRAULIC MOTORS
HYDRAULIC PUMPS
SPRING
REMOTE SUPPLY PRESSURE
INTERNAL RETURN
FIXED DISPLACEMENT
PARALLEL FLOW
FLOW IN ONE DIRECTION
TWO POSITION
THREE POSITION
INFINITE POSITIONING
CROSS FLOW
Electrical Symbols Table
36
Hydraulic Symbols (Electrical)
35
50
G
37 46
43
Transducer (Fluid)
44 45 22
Transducer (Gas / Air)
M
Generator
Electric Motor
24 27
3 20
Pressure Switch (Adjustable)
Pressure Switch
Electrical Wire
Temperature Switch
28 41 Electrical Symbols (Electrical)
47 48
22
23
KK
32
JJ
EE
T
Pressure Symbol
2 32
Temperature Symbol
HYD. TANK
33 34
31
25 26
53
27
39
29
1
51
5
4
Level Symbol
Flow Symbol
Wire Number Identification Codes
25
Electrical Schematic Example
Hydraulic Schematic Example Current Standard
Current Standard Harness identification code This example indicates wire 135 in harness "AG".
Wire Circuit Number Identification
1
43
40
44 45
3 20
4
5
Wire Color
325-AG135 PK-14
42
325-PK Circuit Identification Number
49
GG
Wire Color
28 41
Wire Color
325-PK-14
24
47 48
Wire Gauge
Previous Standard Wire
B
FF
2 32
34
HH
33 26
Circuit Number Identification
SOS
(EXAMPLE VALVE)
26 27
52 53
29 39
51
38
21
35
36 50
37 46
MACHINE COMPONENT LOCATIONS
45 MAIN PUMP and FILTER CIRUITS
MAIN CONTROL VALVE
OM (
BO
ST
IC K
(1
)
23
2)
) G
EL
(L SW IN
AV EL
TR AV
ST
R
TR
) (R EL
EN T T
CH M
TR AV
TA AT
CK E
)
BU
(1
BO OM
ST IC
K(
2)
33 34 25
A
Wire Gauge
22
30 31
FLOW ALLOWED IN EITHER DIRECTION
Printed in U.S.A.
© 2008 Caterpillar All Rights Reserved
CONTROL MANIFOLD
49
SHUTTLE
SPRING LOADED
BASIC SYMBOL
INFINITE POSITION
Universal Quick Coupler
28
38
FOUR-WAY
THREE-WAY
CHECK VALVES
P T SHIFTED POSITION
VENTED
Schematic Location
Pilot Pump Delivery Pressure
TWO-WAY
THREE POSITION
FLUID STORAGE RESERVOIRS
Tap Locations Pressure, Sampling, and Sensor
FF
VALVE PORTS
AB
P T NORMAL POSITION
FWD
ATTACHMENT
LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED
EE
2
NOTE A: Check the parts manual for the correct cylinder part number. NOTE B: Check the parts manual or the Standard Machine Hydraulic Schematic for specific part numbers that match the effectivity of the machine.
GG
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
CONTROL VALVES
27
B-2
TWO POSITION
ONE POSITION
AB
Note B
Left Pump Delivery Pressure
PUMP: VARIABLE and PRESSURE COMPENSATED
2-SECTION PUMP
VALVES
VALVE ENVELOPES
MM
Note B
EE
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
SPRING (ADJUSTABLE)
VARIABILITY
Filter Gp - Pilot Hydraulic
Description
LINE RESTRICTION (FIXED)
RESTRICTION
LL
Filter Gp - Return Oil
Tap Number
CONTROL VALVES
SPRING
FLUID CONDITIONER
(Dimensions: 34 inches x 28 inches)
148-8321
Valve Gp - Check (Quick Coupler)
BASIC COMPONENT SYMBOLS
24 Page
Connector As - Quick Coupler
FLUID POWER SYMBOLS
KENR6122-05
Description