Pi1
Pi4
Pi2
RENR3819-07 August 2005
FLUID POWER SYMBOLS
BASIC COMPONENT SYMBOLS
MAIN AUX.
PUMP or MOTOR
FLUID CONDITIONER
SPRING
CONTROL VALVES
RESTRICTION
HR HL
VARIABLILTY SPRING (ADJUSTABLE) LINE RESTRICTION (VARIABLE) PRESSURE COMPENSATION
LINE RESTRICTION (FIXED)
2-SECTION PUMP
PUMP: VARIABLE and PRESSURE COMPENSATED
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
LINE RESTRICTION (VARIABLE and PRESSURE COMPENSATED)
R3
VALVE ENVELOPES
VALVES
VALVE PORTS
ONE POSITION
TWO POSITION
THREE POSITION
TWO-WAY
THREE-WAY
FOUR-WAY
aR5
aR4
aR3
aR2
aR1
aL1
aL2
aL3
aL4
CONTROL VALVES
AB AB
CHECK VALVES
23 AR5 AR4
22 AR3
21 AR2
20
19 18 AR1 Pi4 17
30 AL1
16 AL2
15
14 AL3
13 AL4
P T NORMAL POSITION
P T SHIFTED POSITION
INFINITE POSITION
BASIC SYMBOL
SPRING LOADED
MEASUREMENT
ROTATING SHAFTS
PRESSURE
TEMPERATURE
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
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
FLUID STORAGE RESERVOIRS
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
COMBINATION CONTROLS
SOLENOID
SOLENOID or MANUAL
SOLENOID and PILOT
SOLENOID and PILOT or MANUAL
SERVO
THERMAL
DETENT
MANUAL CONTROL SYMBOLS
PUSH-PULL LEVER
GENERAL MANUAL
PUSH BUTTON
PEDAL
SPRING
PILOT CONTROL SYMBOLS
RELEASED PRESSURE REMOTE SUPPLY PRESSURE
BR5
BR4
BR3
BR2
BR1
BL1
BL2
BL3
R2
Pi3
EXTERNAL RETURN
INTERNAL RETURN
SIMPLIFIED
COMPLETE
INTERNAL SUPPLY PRESSURE
ACCUMULATORS
CROSSING AND JOINING LINES
HYDRAULIC AND PNEUMATIC CYLINDERS
SPRING LOADED
GAS CHARGED
LINES CROSSING
LINES JOINING
SINGLE ACTING
DOUBLE ACTING
HYDRAULIC PUMPS
FIXED DISPLACEMENT VARIABLE DISPLACEMENT NON-COMPENSATED
HYDRAULIC MOTORS
FIXED DISPLACEMENT VARIABLE DISPLACEMENT NON-COMPENSATED
INTERNAL PASSAGEWAYS
INFINITE POSITIONING THREE POSITION TWO POSITION
UNIDIRECTIONAL
UNIDIRECTIONAL
FLOW IN ONE DIRECTION PARALLEL FLOW CROSS FLOW FLOW ALLOWED IN EITHER DIRECTION
BIDIRECTIONAL
BIDIRECTIONAL
bR5
bR4
bR3
bR2
bR1
DST
bL1
bL2
bL3
bL4
2005 Caterpillar All Rights Reserved
Printed in U.S.A.
10 MAIN
CONTROL VALVE
P1 P2 RD3
PIN
45
RD4 Pi2
RENR3819-07
46 PSA2 T-OUT(2) 47 DR5
PSA1
48
T-OUT(1)
DR2
DRG
PAC
f04860
41
PILOT OIL MANIFOLD
16 Page, B/W
Hydraulic Schematic 158-8176
MAIN CONNECTOR LINE PILOT LINE DRAIN LINE
10
56
55 8
PG DR MU
7 9 5
T Pp3 Pp3 T
9 11 35 10 12 5 2 6 3 54 50 49 57 59 58 53 1
BP2 SPi SDr SP3 SP1 T AL4 aL4 (RAISE) BL3 R2 ST AL3 aL3 (IN) BL2 AL2 (L) BL1 aL2 AL1 (REV) aL1 Di4 Pi4 aR1 (REV) BR1 AR1 aR2 BR2 AR2 aR3 BR3 AR3 aR4 (LOWER) Pi1 AR4 BP1 BR4 SP2 BP3
BPi BDr
BR5 BT R1 AR5 aR5 R3 (CLOSE)
13
14
15
16
17
18
19
20
21
22
23
(IN)
24
36
DB2 DB1 PB1 DB6 PD6
37
PB2
COMPONENTS
39
38
25
26
27
28
Item No.
Component
Item No. 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
Component
29
30 31 32 33
(RAISE) bR4
1 2
Swing Motor Left Travel Motor Right Travel Motor Stick Cylinder Travel Brake Valve (Left) Travel Brake Valve (Right) Bucket Cylinder Boom Cylinder Swivel Main Control Valve Stick Drift Reduction Valve Boom Drift Reduction Valve Boom II Control Valve Stick I Control Valve Swing Control Valve Left Travel Control Valve Straight Travel Control Solenoid Main Relief Valve Right Travel Control Valve Attachment Control Valve Bucket Control Valve Boom I Control Valve Stick II Control Valve Negative Flow Control Relief Valve Negative Flow Control Relief Valve Stick Regeneration Valve Stick Unloading Valve Line Relief Valve (Stick Cylinder Head End) Variable Swing Priority Valve Straight Travel Control Valve
Line Relief Valve (Bucket Cylinder Rod End) Line Relief Valve (Bucket Cylinder Head End) Boom Regeneration Valve Line Relief Valve (Boom Cylinder Rod End) Pilot Control Valve (Travel) Pressure Switch Pressure Switch Pilot Control Valve (Swing and Stick) Pilot Control Valve (Boom and Bucket) Pressure Switch Pilot Oil Manifold Accumulator Reducing Valve (Boom/Swing Priority Mode) Pressure Sensor (Left Pump) Travel Speed Solenoid Valve Swing Parking Brake Solenoid Valve Valve Solenoid Valve (Hydraulic Activation) Left Pump Pilot Pump Slow Return Check Valve Bypass Check Valve Return Filter Right Pump Oil Cooler Hydraulic Tank Case Drain Filter Pilot Relief Valve Pilot Filter Pressure Sensor (Right Pump)
34
3 4 5 6 7 8 9 10 11 12
DOWN
OUT
CLOSE
OPEN
UP
IN
HL
bL4
Di2
Pi2
(OUT) bL3
(R) Pi3 Di3 bL2
(FWD) bL1
(FWD) DST PL PR bR1 bR2
(OPEN) bR3
(OUT) Di1 bR5
HR
A1
A2
A3
A4
A5
A6
A7
A8
RENR3819-07
B1
B2
B3
B4
C B5
B6
B7
B8
13 14
A2 FR B1 A1 DR M2 G2
44
15 16 17 18 19 20 21
G4
16 Page, B/W
40
41
42
U B2 RR P2 P1 A2
49
Pn2 Ps2 PsM2
45
P1 P2 Pi1
46
Pi2 (SW PARKING) PSA1 PSA2 NO1 (TRAVEL)
47
NO3 (LOCK) PAC
48
S3
43
S1
22 23 24 25 26 27 28 29 30
51 52
50
Dr2 Dr1 G3 PsM1
B C
G F E
53
DR1 DR2 DR3 DR4 DR5 DR6 TOUT1 TOUT2 PIN
Ps1 A1
54
OUT IN A3 M1 G1 Pm
Pn1 Pi
55
56
f04859
57
58
59
60
