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8/3/2019 HIDRAULIC 320C
http://slidepdf.com/reader/full/hidraulic-320c 1/2
R E N R 3 8 1 9 - 0 7
1 6 P a g e , B / W
RENR3819-07August 2005
320C ExcavatorsHydraulic SystemBEA1-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 a R3 aR2 aR1 aL1 aL2 a L3 aL4
AR 4 AR 3 A R2 AR1 Pi4 AL1 AL2 AL3 AL4
BR5 BR4 BR3 BR2 BR1 BL1 BL2 BL3 R2 Pi3
bR5 bR4 bR3 bR2 b R1 D ST b L1 b L2 b L3 b L4
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 MANIFOLDf04860
17
30
ONE POSITION T WO POSI T ION T H R EE POSI TI ON
V EN TE D P RE SS UR IZ ED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
L INE S CROS SING L INE S J OINING
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 andPRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
U NI DI RE CT IO NA L B ID IR EC TI ON AL
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 CONDITIONERPUMP 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
SOLENOIDor MANUAL
SOLENOIDand PILOT
SOLENOID andPILOT or MANUAL
COMBINATION CONTROLS
SOLENOID SERVO THERMAL DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
B AS IC S YM BO L S PR IN G L OA DE D
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOWPARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SH I F TED POSI T ION I N F I NI T E POSI T ION
CONTROL VALVES
8/3/2019 HIDRAULIC 320C
http://slidepdf.com/reader/full/hidraulic-320c 2/2
R E N R 3 8 1 9 - 0 7
1 6 P a
g e , B / W
Hydraulic Schematic
PILOT LINE
DRAIN LINE
IN
T
OUT
BDr
Pi2
(LOCK)
Pi
Dr1
A3 M1
M2
A1
A2
NO3
TOUT1
PIN
PAC
Pi1P2P1 PSA2
DR6DR5
PSA1
DR4DR3DR2DR1
BP1 BT
B A
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
A 2 B 1
B8B7B6C B5B4B3B2B1
A8A7A6A5A4
Pn2
A3A2A1
E
D
C
B
G3
SDr
PD6
ST
G4
DB6
Pm
PB2
SP1
A
SP2
P i3 D i3 DST
(IN)
PRPL
(OUT)
AR4
R1BR4
AR3BR3AR2BR2
Dr2
Ps2
SPi
SP3
(RAISE)
AR1BR1
BR5Di4
Pi4
AL1
bL3
AR5
G2
G1
AL4
DB2
BL1
C L O S E
AL2
O P E N
A B
DB1
A1
R3BL2
BPi
AL3
PB1
D O W N
R2
BP3
L R
BP2
bR4
aR5Pi1aR4
bR5
HR
Di1
aR3
bR3
aR2
bR2
aR1
bR1
aL1
bL1HL
aL2
bL2bL4 Pi2
aL4
Di2
I N U P
Pp3Pp3
O U T
NO1
TOUT2
(SW
PARKING)
BL3
aL3
MU
DR
AB
PG
158-8176
1 2 3
4
5 6 7 8
9
11
1
ItemComponent
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
ComponentNo.ItemNo.
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
Pressure Switch
Pressure Switch
Pilot Control Valve (Swing and Stick)
Pilot Control Valve (Boom and Bucket)
Pressure Switch
Accumulator
Reducing Valve (Boom/Swing Priority Mode)
Pressure 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
Pressure 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
1012
13 14 1516
18 19 20 21 22 23 24
25
17
28 3026
27
29
3 1 3 2 33 34
35
36 37
38
39
4041 42
43
44
45 46 47 48
49
5051
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