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304CR hyd
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RENR6667-01September 2003
304 CR Excavator
NAD1-UPBTN1-UP
Hydraulic System
P3
T2B9
A9 A8
B8
A7
B7 B6
A6 A5 A4
B5 B4
P2
P1
A3
B3
B2
A2
T1
B1
A1
Main Control Valve
Pilot Oil Manifold
24
2220 18 31
29 13
2627 2830
32
15
19
21
23
25
12
f05648
B A
PAC
4341
44
40
16
17
2003 CaterpillarAll Rights Reserved
Printed in U.S.A.
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)
PRESSURECOMPENSATION
PUMP: VARIABLE andPRESSURE COMPENSATED
ENERGY TRIANGLESHYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONERPUMP or MOTOR
FLUID POWER SYMBOLS
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLSRELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED COMPLETE INTERNALSUPPLY 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 ACTINGSINGLE ACTING
BASIC SYMBOL SPRING LOADED
CHECK VALVES
TWOPOSITION
INFINITEPOSITIONING
FLOW IN ONEDIRECTION
FLOW ALLOWED INEITHER DIRECTION
THREEPOSITION
CROSSFLOW
PARALLELFLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P TSHIFTED POSITION INFINITE POSITION
CONTROL VALVES
L3 STICK L1 L4 SWING L2
P TP
R3 BOOM R1 R2 BUCKET R4
T
Pa2,Pi1 Pb2,Pi4 Pa1 Pb1 Pb5 Pa5 Pa7 Pb7
P
Pb3(LH)
Pa3
4 TRAVEL1
Pb4
2
Pa4
TRAVEL(RH)
P
2 1
Pb8Pa8
P
T
Pa9 Pb9
C A PAC B
D
T
P
T
M
ENGINE
P1 P2 P4 P3
Pb1 Pb2 Pb3 P1T1
Pp P2
B A
P
Dr
B A
P
DrDr
A
A
C
C
D
D
B
B
DBSH
PG
A M B
F
F E
E
G G
P P
A1 B1 B2Pa1
DR1Pi1
A2Pa2
A7 B7A8 B8 A9 B9Pa7
Pa8 Pa9
T2
Pi4Pb9Pb8Pi3Pb7
B3 PsPa3 Pa4
B4 A4Pa5
B5 A5Pa6
B6A6A3
Pb4 Pb5 Pb6 Pi2
Hydraulic Schematic222-0614
T
B A
DR2
B6 A6
Pb6Pa6
T1 P
T
B A
BOOM CYLINDER
C2
V2 Pi1
A8 B8
R3R1
STICK CYLINDER BOOM CYLINDER
L3 L1 R1 R3
B1A1
C1D1
A2B2
L3R3
D2C2
R1L1
BUCKET CYLINDER
A7 B7
R2R4
PILOT LINE
DRAIN LINE
MAIN CONNECTOR LINE
SECOND AUXILIARY FUNCTION ATTACHMENT
ItemComponent
STANDARD COMPONENTS
ComponentNo.ItemNo.
123456789
101112131415161718192021222324
1 2 3
45
6
7 8 9
66
6
10 11
33
34
13 14
15 16 1718
26 27 28
29
30
31
32
19 20
21
2223
24 25
3536
37
3839
45
46
40 41 4243
44
4748
49
19
5 7 5
4
13
49
25
Travel Motor (Left)
Travel Motor (Right)
Swing Motor
Bucket Cylinder
Boom Cylinder
Swivel
Stick Cylinder
Blade Cylinder
Pilot Control Valve (Boom/Bucket)
Pilot Control Valve (Stick/Swing)
Main Control Valve
Bucket Control Valve
Boom I Control Valve
Stick Control Valve
Attachment Control Valve
Flow Switching Valve
Swing Control Valve
Blade Control Valve
Boom II Control Valve
Boom Drift Reduction Valve
Left Travel Control Valve
Right Travel Control Valve
Swing Boom Cylinder
Swing Boom Control Valve
Main Relief Valve
26272829
Line Relief Valve (Boom Cylinder Head End)
Line Relief Valve (Boom Cylinder Rod End)
Line Relief Valve (Bucket Cylinder)
303132333435363738394041424344454647484950515253545556 Quick Disconnects
Joystick Control Selector Valve
Ball Valve
Ball Valve
Ball Valve
Pilot Control Valve (Work Tool)Boom Lowering Control Valve
Hydraulic Tank
Pilot Control Valve (Blade)
Return Filter
Accumulator
Pilot Manifold
Oil Cooler
Swing Boom PumpPilot Pump
Left Pump
Right PumpPilot Control Valve (Travel)
Manifold
Line Relief Valve (Stick Cylinder Head End)
Line Relief Valve (Stick Cylinder Rod End)
12
5354
52
51
AUXILIARY HYDRAULIC SYSTEM
50
15
18 15
55
BOOM LOWERING CONTROL VALVE JOYSTICK CONTROL SELECTOR
56 56
Attachment Schematics
Solenoid Valve (Parking Brake Release)
Solenoid Valve (Hydraulic Activation Control)
Pilot Relief Valve
Relief Valve
Pilot Control Valve (Swing Boom)
P3
Main Relief Valve
Main Relief Valve
f05647
33 93
45 6 48 39
2
10
1
114055
5134478
35 36 37 38
7
4
50
39
4055
33
34 47 51 1 2
35 36 37 38
10 11
8
48
5
45
123
6