© 2003 Caterpillar
RENR3613-01 January 2003
320C U Excavator Hydraulic System
APA1-UP
CLM1-UP ALX1-UP CLZ1-UP
FBB1-UP GAB1-UP MAC1-UP PAC1-UP
DR2
T-OUT(2)
PSA1
DR1
PSA2
P-IN
Pi1
P2
PAC
P1
DR6
T-OUT(1)
DR5
Pi2
DR4
X
TANK3
AL4 AL3
AL2 AL1 BL4 BL3 BL2 BL1
28 27 26 25 24 35
23
22 21 20 18
47
46 45
44
Main Conrol Valve
Pilot Oil Manifold
13
43
Trang 2IN T
OUT
BDr
Pi2
Pi Dr1
M2
A1
A2
NO3
PIN
PAC Pi1
P2
DR6 DR5
PSA1
DR4 DR3 DR2 DR1
B A
T
T
S1 S3
Pn1
TOUT2 TOUT1
RR
E F
FR
PsM2
Ps1 PsM1
T
P1 P2
B2 A2 B1
C
B A
U
Pn2
B8 B7 B6
C B5 B4 B3 B2 B1
A8 A7 A6 A5 A4 A3 A2 A1
SDr
ST SP1 SP2
AR4
R1 BR4
AR3 BR3 AR2
BR2
SPi
SP3
AR1 BR1
BR5
PB6
DB6 PB2
PB1
Di4 Pi4 AL1
bL3
AR5
Pm
G2
G1
AL4
DB1
BL1
DB2
AL2
A B
PB5
A1
BL2
BPi
AL3 R2
G4 BP3
G3
BP2
bR4
aR5 Pi1
aR4
bR5
HR Di1
aR3
bR3
aR2
bR2
aR1
bR1
aL1
bL1
Dr2
HL
Ps2
aL2
bL2
aL4
Di2 DB5
Pp3
R3
Pp3
DR
BL3
aL3
MU DR
A B
PG
PILOT LINE DRAIN LINE
Hydraulic Schematic
MAIN CONNECTOR LINE 171-0097
Item
Component
STANDARD COMPONENTS
Component
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
35 36 37 38 39 40 41
33 34
45 46 47 48
42 44 43
50 49 51
54 55 56 57
52 53
58
1
4
10
11
14
15
16
17
23
31
32 33
34
35
36 37
38 39 40
41
42
43 44 45
46
47
48
49
50
51
30 31 32
59 60 61 62
Stick Cylinder Swing Motor Travel Motor (Left) Travel Motor (Right) Anti-Reaction Valve (Swing Motor) Travel Brake Valve (Left)
Travel Brake Valve (Right) Bucket Cylinder
Boom Cylinders Swivel
Pilot Control Valve (Travel) Stick Drift Reduction Valve Main Control Valve Boom Drift Reduction Valve Pressure Switch
Pressure Switch Negavtive Flow Control Relief Valve Boom II Control Valve
Stick Regeneration Valve Stick I Control Valve Swing Control Valve Left Travel Control Valve Straight Travel Control Solenoid Right Travel Control Valve Attachment Control Valve Bucket Control Valve Boom I Control Valve Stick II Control Valve Pilot Control Valve (Swing and Stick) Pilot Control Valve (Boom and Bucket) Stick Unloading Valve
Line Relief Valve (Stick Cylinder Head End)
Variable Swing Priority Valve Straight Travel Control Valve Main Relief 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) Negative Flow Control Relief Valve Logic Valve
Pressure Switch Pilot Oil Manifold Travel Speed Solenoid Valve Swing Parking Brake Solenoid Valve Valve (Hydraulic Activation) Solenoid Valve (Hydraulic Actation) Accumulator
Reducing Valve (Boom/Swing Priority Mode) Pressure Sensor (Left Pump)
Bypass Check Valve Slow Return Check Valve Oil Cooler
Hydraulic Tank Return Filter Case Drain Filter Pilot Relief Valve Pilot Filter Left Pump Right Pump Pilot Pump Pressure Sensor (Right Pump)
52
53
54
55
56 57
58
59
60
61
62
1
8
56 54
53
61
60 59 58
55 57
12 13 14 17 18 19 20
21 22 23 24 25 26 27
28 31 32 33 34 35
36 37 38 39 40
6 3
7 4
43 44 45 46 47
9
2 10
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