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390D Excavator Hydraulic System
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INTERACTIVE SCHEMATIC
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Cover PageInformation
SchematicMachine Views
Component TableTap Table
Fluid Power Symbols
Electrical Symbols
Front Frame
Rear Frame
Tap Views
Features
Options
Bookmarks X
EC-C3EC-C2 E-C60
EC-C1
E-C61
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©2010 Caterpillar, All Rights Reserved Printed in U.S.A.
KENR7742November 2010
390D Excavator Hydraulic System - AttachmentWAG1-UPBYP1-UPWAP1-UPWBT1-UPKCZ1-UP
Boom Float
COMPONENT LOCATION
Description PartNumber
MachineLocation
SchematicLocation
335-0538335-0547212-5467210-8157
Note ANote ANote A
242-6878234-4531185-03366E-55346E-5534310-0122247-8978225-4614295-9447295-9446209-5895209-5895170-9918295-9678334-9990155-9222221-8859221-8859260-2180260-2180295-9595227-0678173-3429201-9382201-9381 241-8929295-7767140-0736352-6819116-3420155-9200155-9200
Accumulator GP - Hydraulic (Charged) 335-0547Sensor AS - Pressure (Boom Lowering) 221-8859Switch AS - Pressure (Boom Lower) 202-9002Valve GP - Check 297-0370Valve GP - Load Control (Boom) 274-9053Valve GP - Main Control (Smartboom, Boom Load Control) 295-7767Valve GP - Manual (Boom Lower) 270-5692Valve GP - Solenoid 171-0028
Attachment - Boom Float
Note A: Check Parts Manual For Proper Cylinder Part Number
Accumulator GP - Charged (Return Line)Accumulator GP - Hydraulic (Charged)Breather GPCooler GP - Hydraulic OilCylinder GP - BoomCylinder GP - BucketCylinder GP - StickFilter GP - Oil (Hydraulic)(Return) 1Filter GP - Oil (Hydraulic)(Return) 2Filter GP - Oil (Hydraulic)Filter GP - Oil (Hydraulic)(Case Drain, Motors)Filter GP - Oil (Hydraulic)(Case Drain, Pumps)Manifold and Valve GP - Load SensingMotor GP - FanMotor GP - Hydraulic FanMotor GP - Swing (Front)Motor GP - Swing (Rear)Motor GP - Travel (Left)Motor GP - Travel (Right)Pump GP - Fan MotorPump GP - Hydraulic (Swing)Pump GP - Hydraulic (Main)Pump GP - PilotSensor AS - Pressure (Load Sensing)Sensor AS - Pressure (Overload Warning)Sensor AS - Pressure (Main Pump)Sensor AS - Pressure (Swing Pump)Swivel GPTank AS - Hydraulic OilValve GP - Check 1Valve GP - Check 2Valve GP - Check 3Valve GP - Control (Swing)Valve GP - Control (Main)Valve GP - Manifold and ReducingValve GP - Solenoid (High Pressure Cutoff)Valve GP - Swing CushionValve GP - Travel Counterbalance (Left)Valve GP - Travel Counterbalance (Right)
1 C-12 D-43 A-84 B-75 F-76 F-87 F-88 A-89 A-810 B-811 A-712 A-713 B-514 A-615 A-716 F-417 F-318 F-619 F-520 A-521 A-422 A-323 A-524 B-625 C-626 A-327 A-528 E-529 A-830 A-631 C-132 C-833 E-33435 D-536 B-537 E-438 E-639 E-5
50 D-451 E-752 F-753 F-854 F-75556 E-757 F-8
C-4
C-3
TAP LOCATION
TapNumber Description Schematic
LocationDrive Pump Output PressureIdler Pump Output PressureLoad Sense Pressure (Main Hydraulic Pump)Stroking Pressure (Swing Pump) Pilot Pump Output PressurePilot Pressure to Swing PumpPilot Accumulator PressurePower Shift Pressure (Main Hydraulic Pump)
A A-3B A-3
LS2 A-2M1 A-4P A-5P1 A-5PG D-4PS1 A-3
FLUID POWER SYMBOLS
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 RESTRICTIONVARIABLE 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
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
SOLENOIDor MANUAL
SOLENOIDand PILOT
SOLENOID and PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID SERVO THERMAL DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASICSYMBOL
SPRINGLOADED
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
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOTCONTROLLED
ELECTRICAL SYMBOLSHydraulic Symbols (Electrical)
325-AG135 PK-14
Circuit IdentificationNumber
Wire Color Wire Gauge
Harness identification codeThis example indicateswire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example Hydraulic Schematic Example
325-PK
Wire ColorCircuit Number Identification
B A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer(Fluid)
Transducer(Gas / Air)
G
Generator
Electrical WirePressure Switch
MElectric Motor
Pressure Switch (Adjustable)
Temperature Switch
PressureSymbol
TemperatureSymbol
LevelSymbol
FlowSymbol
Electrical Symbols (Electrical)
T
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSPILOT PUMP OUTPUTDRIVE PUMP OUTPUTHIGH PRESSURE CUTOFF CIRCUITDRIVE AND IDLER PUMPS COMBINED CIRCUITFAN PUMP AND CIRCUITSUPPLY LINESTICK CYLINDER & CONTROL CIRCUITLEFT TRAVEL MOTOR & CONTROL CIRCUITATTACHMENT CONTROL CIRCUITSWING MOTOR & CONTROL CIRCUITDRAIN / RETURN LINESWING BRAKESIDLER PUMP OUTPUT BUCKET CYLINDER & CONTROL CIRCUITRIGHT TRAVEL MOTOR & CONTROL CIRCUITBOOM CYLINDER & CONTROL CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)YY
(52) VALVE GP - CONTROL 138-1234
Callout Number(Machine Location from
Component LocationsTable)
ComponentName
Part Number
Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
390D EXCAVATOR HYDRAULIC SYSTEMATTACHMENT: BOOM FLOAT
PART NUMBER: 297-0424, CHANGE: 00, VERSION: HEMEDIA NUMBER : KENR7742
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
TRAVEL MOTOR (RIGHT)TRAVEL MOTOR (LEFT)
Pi5
Pi4
Pi3
Pi2
Pi1
PS
A4
PS
A3
PS
A2
PSA1
PAC
DR
1
DR
2
DR
3
DR
4
DR
5
DR
6P-INT-OUT
Pi6
DR6
DR5
GT2T1 R
AM2
A
S DR1 DR S M1
L2
L1
P2
D2S1D1
P1PS1 SA1 SA2a1 a2
LS1 LS2
AL3 BL3
PP3
T1
T2
BG
BA
AG BG AG
AB
T2
T1
PP3
A
DR
B
DR
A B
DR1
PS2
Pi1
P.P.
I
P.P.O
SWING MOTOR (FRONT) SWING MOTOR (REAR)DB
PG
SDr2PTSDr1
MM
PG2 DBPG1
PA
B
BA
PA PB
A
A1 B1A1 B1
(R) (L)
(R)(L)
(FWD)(FWD) (REV)
(REV)
L1G
Dr
L2
T
C1
C2
P
Dr
PF PR
BR2 AR2 BR3 AR3
AL2 BL2
AL1 BL1
PR
PF
AR1BR1
BR2 AR2 BR3 AR3
A
BLBRL BR
A
B
Qmax Qmin
(REV)(REV)(IN)
(FWD)(FWD)(OUT)
STI
CK
TRAV
EL(
L)
TRAV
EL(
R)
(CLOSE) (UP)
(OPEN) (DOWN)
BO
OM
BU
CK
ET
ATC
H
HPC-ON
aR3aR2aR1
bR3bR2bR1
R2
aL1aL2aL3
bL1bL2bL3
R1 HPC-OFF
(RET)
(EXT)
PS2
PS2
PS3
PS3 DR3
DR3 DR2
DR2
PS4 DR4
Pi2
Pi2
DR4
MU
PS4
AL1
BL1
BR1AR1AL2 BL2
MU
SP
PR
PD
PG
PB
TT CV CV
CYLCYL
Pi Pi DRDR
A1
A2
DR
A B
XX
P T
A1
A2
(1) ACCUMULATOR GPCHARGED (RETURN LINE)335-0538
(50) ACCUMULATOR GPHYDRAULIC (CHARGED)335-0547
(8) FILTER GPOIL (HYDRAULIC)
(RETURN) 1242-6878
(9) FILTER GPOIL (HYDRAULIC)
(RETURN) 2234-4531
(10) FILTER GPOIL (HYDRAULIC)
185-0336
(11) FILTER GPOIL (HYDRAULIC)(CASE DRAIN, MOTORS)6E-5534
(13) MANIFOLD AND VALVE GPLOAD SENSING310-0122
(14) MOTOR GPFAN247-8978
(15) MOTOR GPHYDRAULIC FAN225-4614
(16) MOTOR GPSWING (FRONT)295-9447
(17) MOTOR GPSWING (REAR)295-9446
(18) MOTOR GPTRAVEL (LEFT)209-5895
(19) MOTOR GPTRAVEL (RIGHT)209-5895
(20) PUMP GPFAN MOTOR
170-9918
(21) PUMP GPHYDRAULIC(SWING)295-9678
(22) PUMP GPHYDRAULIC (MAIN)334-9990
(23) PUMP GPPILOT
155-9222
(28) SWIVEL GP295-9595
(30) VALVE GPCHECK 1173-3429
(31) VALVE GPCHECK 2201-9382
(32) VALVE GPCHECK 3201-9381
(33) VALVE GPCONTROL (SWING)241-8929
(35) VALVE GPMANIFOLD AND REDUCING140-0736
(36) VALVE GPSOLENOID(HIGH PRESSURE CUTOFF)352-6819
(37) VALVE GPSWING CUSHION116-3420
(38) VALVE GPTRAVEL COUNTERBALANCE (LEFT)
155-9200 (39) VALVE GPTRAVEL COUNTERBALANCE(RIGHT)155-9200
LS2
PS1
M1
P
P1 BA
PG
(26) SENSOR ASPRESSURE (MAIN PUMP)260-2180
(27) SENSOR ASPRESSURE
(SWING PUMP)260-2180
(25) SENSOR ASPRESSURE(OVERLOAD WARNING)221-8859
(24) SENSOR ASPRESSURE(LOAD SENSING)221-8859
(3) BREATHER GP212-5467
(4) COOLER GPHYDRAULIC OIL210-8157
(29) TANK ASHYDRAULIC OIL
227-0678
(12) FILTER GPOIL (HYDRAULIC)(CASE DRAIN, PUMPS)6E-5534
(5) CYLINDER GPBOOM
(7) CYLINDER GPSTICK
(6) CYLINDER GPBUCKET
(57) VALVE GPSOLENOID171-0028 (53) VALVE GP
CHECK297-0370
(54) VALVE GPLOAD CONTROL (BOOM)
274-9053
(56) VALVE GPMANUAL (BOOM LOWER)270-5692
(55) VALVE GPCONTROL (MAIN)(SMART BOOM,
BOOM LOAD CONTROL)295-7767
(51) SENSOR ASPRESSURE
(BOOMLOWERING)
221-8859
(52) SWITCH ASPRESSURE
(BOOM LOWER)202-9002
(34) VALVE GPCONTROL (MAIN)295-7767
F8
E8
D8
C8
B8
A8
F7
E7
D7
C7
B7
A7
F6
E6
D6
C6
B6
A6
F5
E5
D5
C5
B5
A5
F4
E4
D4
C4
B4
A4
F3
E3
D3
C3
B3
A3
F2
E2
D2
C2
B2
A2
F1
E1
D1
C1
B1
A1
MACHINE COMPONENT LOCATIONS
P
P1
M1
A
PS1
B
LS2
3938
37
34
33
30
29
2827
26
24
23
22
2120
19
18
1716
1514
13
12
11
10
9
8
7
6
5
4
3
BOOM FLOAT
57
56
55
54 53
52
51
50
MAIN CONTROL COMPONENT LOCATIONS
REAR VIEW
FRONT VIEW
PG
36
35
32
31
25
2
1
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