Component Locations
BASIC COMPONENT SYMBOLS MAIN AUX.
Part Machine Schematic Number Location Location
Description
FLUID POWER SYMBOLS
RENR9107-02 October 2009 PUMP or MOTOR
CONTROL VALVES
SPRING
FLUID CONDITIONER
LINE RESTRICTION (FIXED)
RESTRICTION
PUMP: VARIABLE and PRESSURE COMPENSATED
2-SECTION PUMP
Attachment Block Valve Gp - Check Valve Gp - Check Valve Gp - Flow Control Valve Gp - Load Control
201-9379 215-4890 215-4919 201-9236 225-4843
1 2 3 4 5
D-5 E-1 D-1 D-1 E-7
Valve Gp - Solenoid
185-0472
6
C-1
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
SPRING (ADJUSTABLE)
VARIABILITY
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
VALVES VALVE ENVELOPES
VALVE PORTS
TWO POSITION
ONE POSITION
Standard 324D
TWO-WAY
THREE POSITION
Accumulator Gp - Pilot Manifold
Note B
20
B-5
Block
Note B
21
D-8
Cylinder Gp - Boom
Note A
22
F-2, F-3
Cylinder Gp - Bucket
Note A
23
F-8
Cylinder Gp - Stick
Note A
24
F-8
Filter Gp - Case Drain
Note B
25
A-5
Note B
26
A-4
Note B
27
A-7
Manifold Gp - Control
Note B
28
B-5, B-6
Motor Gp - Swing
Note B
29
F-6
Motor Gp - Left Travel
Note B
30
F-5
Motor Gp - Right Travel
Note B
31
F-4
Pump Gp - Main Hydraulic
Note B
32
B-2
PRESSURE
Tap Locations Pressure, Sampling, and Sensor Tap Number EE
Description
Schematic Location
Left Pump Delivery Pressure
B-3 A-3
Note B
33
B-3
FF
Right Pump Delivery Pressure
Sensor As - Left Pump Pressure
Note B
34
B-3
GG
Pilot Pump Delivery Pressure
A-4
Sensor As - Right Pump Pressure
Note B
35
A-3
HH
Left Pump Power Shift Pressure
B-2
Switch As - Boom Down Pilot Pressure Switch As - LH Travel Pressure
Note B Note B
36 37
D-8 D-8
JJ
Case Drain Pressure
B-2
KK
Right Pump Power Shift Pressure
A-2
Hydraulic Oil Sampling Port
A-3
Switch As - Pilot Pressure
Note B
38
B-7
Switch As - RH Travel Pressure
Note B
39
D-7
40
E-5
Note B
41
A-5
INFINITE POSITION
SOS
Valve Gp - Check and Relief
Note B
42
D-1, E-1
Valve Gp - Cooler Bypass
Note B
43
A-8
Valve Gp - Heavy Lift Solenoid
Note B
44
A-4
Valve Gp - LH Joystick
Note B
45
C-8
Valve Gp - Main Control
Note B
46
C-1 thru C-6
Valve Gp - Pilot Travel Valve Gp - Pressure Reducing Boom/Swing Valve Gp - RH Joystick
Note B Note B Note B
47 48 49
D-7, D-8 B-3, B-4 C-7
Valve Gp - Shuttle
Note B
50
B-7, B-8
Valve Gp - Swing Cushion Valve Gp - Travel LT Counterbalance Valve Gp - Travel RT Counterbalance
Note B Note B Note B
51 52 53
E-6 E-5
SHUTTLE
SPRING LOADED
BASIC SYMBOL
PILOT CONTROLLED
ROTATING SHAFTS
FLOW
TEMPERATURE
UNIDIRECTIONAL
BIDIRECTIONAL
FLUID STORAGE RESERVOIRS
Sensor As - Head In Boom Cylinder Press.
Note B
P T SHIFTED POSITION
P T NORMAL POSITION
MEASUREMENT
Filter Gp - Pilot Hydraulic
Swivel Gp
CHECK VALVES
AB
AB
Filter Gp - Return Oil
FOUR-WAY
THREE-WAY
CONTROL VALVES
Tank Gp - Hydraulic Oil
ATTACHMENT
LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED
320D Excavator Hydraulic System - Attachment
VENTED
RETURN ABOVE FLUID LEVEL
PRESSURIZED
COMBINATION CONTROLS
KGF1-UP MCH1-UP TDH1-UP DHK1-UP FAL1-UP KLM1-UP SPN1-UP PHX1-UP
SOLENOID
SOLENOID or MANUAL
SERVO
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
MANUAL SHUTOFF
PUSH-PULL LEVER
GENERAL MANUAL
PUSH BUTTON
PEDAL
SPRING
PILOT CONTROL SYMBOLS RELEASED PRESSURE
EXTERNAL RETURN
REMOTE SUPPLY PRESSURE
INTERNAL RETURN
SIMPLIFIED
CROSSING AND JOINING LINES
ACCUMULATORS
SPRING LOADED
GAS CHARGED
LINES CROSSING
HYDRAULIC PUMPS FIXED DISPLACEMENT
E-4
Note A: Refer to parts manual for specific cylinder information. Note B: Part numbers are located on the main Hydraulic System Schematic according to the effectivity of the machine.
RETURN BELOW FLUID LEVEL
HYDRAULIC AND PNEUMATIC CYLINDERS
LINES JOINING
SINGLE ACTING
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
DOUBLE ACTING
INTERNAL PASSAGEWAYS
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
INTERNAL SUPPLY PRESSURE
COMPLETE
FLOW IN ONE DIRECTION
TWO POSITION
THREE POSITION
INFINITE POSITIONING
CROSS FLOW
PARALLEL FLOW
FLOW ALLOWED IN EITHER DIRECTION
Stick Lowering Control Printed in U.S.A.
© 2009 Caterpillar All Rights Reserved
Electrical Symbols Table
33 40
49
45
6
21
Hydraulic Symbols (Electrical)
37
38 50
G
39 47
1
Transducer (Fluid)
36 46
22
24
Transducer (Gas / Air)
M
Generator
Electric Motor
5 27
4
Pressure Switch (Adjustable)
Pressure Switch
Electrical Wire
Temperature Switch
20 28 Electrical Symbols (Electrical)
44 48 22 32 34 35
23 KK
32
JJ
T
EE
Pressure Symbol
42 29
31
25
53
26 27
51
41
HYD. TANK
2
Flow Symbol
Level Symbol
Wire Number Identification Codes Electrical Schematic Example
25
3
Temperature Symbol
Hydraulic Schematic Example Current Standard
Current Standard Harness identification code This example indicates wire 135 in harness "AG".
Wire Circuit Number Identification
Wire Color
325-AG135 PK-14
4
43
1
20 28
41
45
36 46
49
325-PK Circuit Identification Number
42
Wire Color
Wire
5
Wire Gauge
Previous Standard
GG
24
44 48
Wire Color
325-PK-14 B
32
FF
34 35
34
HH
35
26
22
25 26 27
23 37
30 31
29
2
52 53
51
3 33
6 21 40
39 47
38 50
MACHINE COMPONENT LOCATIONS
MAIN PUMP AND FILTER CIRCUITS
SOS
Circuit Number Identification
A
Wire Gauge (EXAMPLE VALVE)
24 Page, (Dimensions: 34 inches x 28 inches)
43
RENR9107-02
30 52