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)
PUMP
(2 - SECTION)
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
PRESSURE
COMPENSATION
PUMP
(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
OR MANUAL
SOLENOID
& PILOT
SOLENOID &
PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
2 POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW IN
EITHER
DIRECTION
3 POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT
AB
PT
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
MAIN AUX
LINE RESTRICTION
(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
INTERNAL
SUPPLY PRESSURE
COMPLETE
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
HARNESS IDENTIFICATION CODE THIS EXAMPLE
INDICATES WIRE 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 COLOR
CIRCUIT NUMBER
IDENTIFICATION
B
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER
(FLUID)
M
ELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
KENR7787-03
30 Page, (Dimensions: 39 inches x 28 inches)
KENR7787-03
April 2012
345D and 349D Excavator
Hydraulic System - Attachment
Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved
345D:
RGD1-UP
RGG1-UP
KFH1-UP
NLM1-UP
GYR1-UP
LKY1-UP
349D:
RBJ1-UP
KHS1-UP
System 17: Combined Function
MAIN CONTROL / PILOT
1263637 2032
19
31
AR4
AR2AR1
BR1 BR2
AL1AL2
BL1BL2BL3
AL3
AL4
BL4
X
AR3
STICK(2) BUCKET TRAVEL(R) TRAVEL(L) STICK(1)
PTA PSW
PiH
BOOM(1) ATCH STR TRAVEL SWING BOOM(2)
SYSTEM 17
4042 43 4445 4647 4851 5253
42 46
50
48
IIHH GG
FF
GG FF
Y
BR3
COMPONENT LOCATIONS
31
31
1
1
24
3
24
2
19
19
15
15
23
23
11
12
11
12
18
17
18
17 6
6
10
10
27
27
25
2513
13
38
21
21
22
22
30 34
30 34 33
33
8
8
5
5
7
7
26
26
13
28
28
PILOT SHUTTLE
4149
UNDER CAB
Tap Locations
Pressure and Sampling
Tap
Number
Description
Schematic
Location
AA Pump Pressure (Right Bank) B-3
BB Pump Pressure (Left Bank) A-3
CC Power Shift Pressure A-3
DD Pump case drain A-2
EE Pilot Pressure B-2
FF Attachment Pilot Pressure (B2) F-4
GG Attachment Pilot Pressure (B1) F-4
HH Pump Pilo
t Pressure (B2) D-3
II Pump Pilot Pressure (A2 ) D-3
SOS SOS (Scheduled Oil Sampling) B-2
PUMPS AND FILTERS
14
7
5
6
BB DD FF AA SOS EE
7
15
HH II
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Pilot Man. 164-6981 1 C-1
Cylinder Gp - Boom Note A 2 F-3
Cylinder Gp - Bucket Note A 3 F-4
Cylinder Gp - Stick Note A 4 E-4
Filter Gp - Case Drain 289-8194 5 B-2
Filter Gp - Drain Return 289-8194 6 C-2
Filter Gp - Pilot 158-8987 7 B-1
Filter Gp - Return 188-4145 8 C-
1, C-2
Motor Gp - Cooling Fan 295-9429 10 B-4
Motor Gp - Left Travel 232-6180 11 B-8
Motor Gp - Right Travel 232-6180 12 B-7
Motor Gp - Swing 225-4506 13 A-5, B-6
Pump Gp - Cooling Fan 295-9426 14 A-3
Pump Gp - Drive, Idler, Pilot 295-9663 15 A-2
Sensor Gp - Pressure, Bm Dn Pilot 297-4483 31 C-4
Sensor Gp - Pressure, Boom Cyl. Head 221-8859 25 F-3
Sensor Gp - Pressure, Pump 260-2180 17 A-3
Sensor Gp - Pressure, Pump 260-2180 18 B-3
Switc
h As - Press., Bm Up/Stck In Pilot 167-3466 20 E-7
Switch As - Press., Implmnt, Trvl Pilot 106-0179 21 D-5, D-6
Switch As - Pressure, Swing Pilot 167-3466 19 E-8
Swivel Gp 225-4547 22 A-7
Valve Gp - Boom Control 297-0595 25 E-3
Valve Gp - Check, Clr Bypass 123-2505 27 B-4
Valve Gp - Check, Slow Return 285-1715 27 B-5
Valve Gp - Heavy Lift 121-6303 28 B-5
Valve Gp - Left, Travel/Brake 266-7843 11 A-8
Valve Gp - LH Plt Cntrl, Stck/Swn
g 270-5951 30 F-6
Valve Gp - Main Control 310-0101 31 C-3 To D-8
Valve Gp - Pilot Manifold 215-5037 32 C-2
Valve Gp - Pilot, Pump 171-0188 23 D-3
Valve Gp - Plt Contr. Travel 165-9522 33 F-7
Valve Gp - Priority, Boom/Swing 232-4102 26 E-8
Valve Gp - RH Plt Cntrl, Bckt/Bm 270-5952 34 F-6
Valve Gp - Right, Travel/brake 266-7843 12 A-7
Valve Gp - Shuttle, Stick Pilot 123-2430 36 E-7
Valve Gp - Shuttle, Swing Pilot 259-7732 37 E-8
Valve Gp
- Swing Motor 295-9423 38 A-6
Sensor As - Pressure, Attachment 221-8859 40 E-4
Switch As - Pressure, Pilot 309-5769 41 E-6
Tee As 164-5550 42 D-5
Valve Gp - Check 239-9036 43 C-5
Valve Gp - Check, Sol., 1 Way / 2 Way, EC3 297-0370 44 B-4
Valve Gp - Flow Control, Pump 297-0641 45 D-2
Valve Gp - Flow Control, Drain, Boom 2 4I-7836 46 F-5
Valve Gp - Priority, 1 Pump / 2 Pump, Boom 119-5219 47 F-5
Valve Gp - Relief 239-8984 48 C-5
Valve Gp - Shuttle, Pilot 185-0462 49 E-6
Valve Gp - Solenoid, 1 Pump / 2 Pump 121-6303 50 E-5
Valv
e Gp - Solenoid / Press. Reducing 259-7430 51 E-4
Valve Gp - Solenoid / Relief, LH, ER1 297-0265 52 E-5
Valve Gp - Solenoid / Relief, RH, ER2 297-0266 53 E-4
NOTE A : CHECK PARTS MANUAL FOR IDENTIFICATION NUMBERS
Component Locations
System 17 Attachment
KENR7787-03
30 Page, (Dimensions: 39 inches x 28 inches)
Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
ATTACHMENT: SYSTEM 17: COMBINED FUNCTION
SCHEMATIC PART NUMBER: 285-1799, CHANGE: 00, VERSION: HE
MEDIA NUMBER: KENR7787-03
THIS SCHEMATIC IS FOR THE 345D AND 349D EXCAVATOR HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
YY
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
DRIVE PUMP OUTPUT
IDLER PUMP OUTPUT
POWER SHIFT CONTROL CIRCUIT
PILOT PUMP OUTPUT
HYDRAULIC OIL COOLING PUMP OUTPUT
ATTACHMENT CONTROL CIRCUIT
SUPPLY LINE
BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
HEAVY LIFT CONTROL CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
SWING BRAKE CONTROL CIRCUIT
BOOM CYLINDER
STICK CYLINDER
BUCKET CYLINDER
CV
CH CR
Pi DR
T
TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)
X
B
A
B
A
AG
AG
BG
BG
T2
T2
T1
T1
BR
BR
X
B
A
L
L
B
A
DR3 DR4 DR5 T-OUT1
DR6
DR2
T-OUT2
PSA1DR1
PSA2P-IN
P2
P1
1
2
3
4
5
6
7
SDr HL
Dr
X
R2
Pp1
Pp2
SPi2
SDr2 dSW dST1 PiH
Pi2
P1 P2
A1
B1
A2B2
TP
TT
JLP JRP
JLT
JRT
PSW PTA
R3
Y
R1
A
B
A2
B2
MU1
MU2
PG2
DB2
DB1
PG1
DE2
Pi1
aL4
T
A4
B1
Dr1
Di
PS2
PB
D0
PS1
S
L1
L
X
B
a2
a5
a3
PSV
JL1
JL3
JL2
JL4
JR4
JR2
JR3
JR1
PAT
BL2
AL2
bL2
A1
B1
A2
A1
a1
a4
AL4BL4
aL5
SPi
T
OUT
PGPC
IN
SWING MOTOR
AG1 BG1
AG2 BG2
1
2
3
4
5
6
1
2
3
4
5
6
T1 T2 T3 T4
STICK SWING BUCKET
BOOM
(OUT) (IN)
(R)
(L)
(OPEN) (CLOSE) (DOWN)
(UP)
DE1
Pi1
Pi2
SWING MOTOR
HR
AR4
TRAVEL(L) TRAVEL(R)
(BACK)
(FWD)
(FWD)(BACK)
AR1BR1 AL1 BL1
PR
PL
PLPR
BR2AR2
BR3
aR4
aR3
AR3 BR2 AR2
bR2
BR1
AR1
bR1
bL3
bL1
BL1
AL1
AL3BL3
bR3
bR1
aR4bL3 bL4 aL3 aR3 bR2 bR3 aR2
aR1 aL1 bL1
aR2 aR1 aL1
aL3
bL5
bL5 PiL
PiL
DR DR1
L2
L3
A
B
AL3BL3
AR3BR3
TRAVEL(R)
TRAVEL(L)
STICK(1)
SWING
ATCH
BOOM(2)
(UP)
(DOWN)
BUCKET
(OPEN)
(CLOSE)(BACK)
(FWD)
BOOM(1)
(IN)
(OUT)
(FWD)
(BACK)
STICK(2)
(IN)
(OUT)
(R)
(L)
(UP)
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
BB
AA
CC
DD
SOS
EE
FF
bL4
aL2
A
P
T
bR4
T
P
A1
B1
A2
B2
T
P
11
55
4
4
A1 B1A2 B2
A1
A2
A3
A4
A5
A6
A8
A7
B1
B2
B3
B4
B5
B6
B7
B8
GG
II
HH
ACCUMULATOR GP
PILOT MANIFOLD
164-6981
PUMP GP
DRIVE, IDLER
PILOT
295-9663
PUMP GP
COOLING FAN
295-9426
FILTER GP
PILOT
158-8987
FILTER GP
CASE DRAIN
289-8194
FILTER GP
DRAIN RETURN
289-8194
FILTER GP
RETURN
188-4145
SENSOR AS
PUMP PRESS.
260-2180
SENSOR AS
PUMP PRESS.
260-2180
MOTOR GP
COOLING FAN
295-9429
MOTOR GP
SWING
225-4506
VALVE GP
CHECK
SLOW RETURN
285-1715
VALVE GP
CHECK
CLR BYPASS
123-2505
MOTOR GP
SWING
225-4506
VALVE GP
SWING MOTOR
295-9423
VALVE GP
RIGHT
TRAVEL/BRAKE
266-7843
VALVE GP
SOLENOID
HEAVY LIFT
121-6303
SWIVEL GP
225-4547
MOTOR GP
RIGHT TRAVEL
232-6180
MOTOR GP
LEFT TRAVEL
232-6180
VALVE GP
LEFT
TRAVEL/BRAKE
266-7843
VALVE GP
SHUTTLE
SWING
PILOT
259-7732
VALVE GP
SHUTTLE
BOOM / STICK
PILOT
123-2430
VALVE GP
PRIORITY
BOOM/SWING
232-4102
VALVE GP
PILOT CONTROL
TRAVEL
165-9522
VALVE GP
LH PILOT CONTROL
STICK/SWING
270-5951
SWITCH AS
PRESSURE
SWING PILOT
167-3466
SWITCH AS
PRESSURE
BM UP / STICK IN
PILOT
167-3466
VALVE GP
RH PILOT CONTROL
BUCKET/BOOM
270-5952
SWITCH AS
PRESSURE
PILOT
106-0179
VALVE GP
CONTROL
BOOM
297-0595
SENSOR AS
PRESSURE
BOOM
CYL. HEAD
221-8859
VALVE GP
PILOT MANIFOLD
215-5037
VALVE GP
MAIN CONTROL
310-0101
SENSOR AS
PRESSURE,
BOOM DOWN
PILOT : 297-4483
bL2
aL2
CA
CD
CB1
CB2
SINGLE
SINGLE
DOUBLE
DOUBLE
AB
P1
P2
P1
P2
R
G
R
AB
Dr
A
TP
TEE AS.
164-5550
bR4
VALVE GP
SHUTTLE
PILOT
185-0462
SWITCH AS
PRESSURE
PILOT
167-3466
VALVE GP
SOLENOID
1 PUMP / 2 PUMP
121-6303
VALVE GP
PRIORITY
1 PUMP / 2 PUMP
BOOM
119-5219
VALVE GP
FLOW CONTROL
DRAIN
BOOM 2
4I-7836
VALVE GP
SOL., RLF
LH, ER1
297-0265
SENSOR AS
PRESSURE
ATTACHMENT
221-8859
VALVE GP
SOL., RELIEF
RH, ER2
297-0266
VALVE GP
SOLENOID /
PRESSURE REDUCING
259-7430
VALVE GP
CONTROL
PUMP
297-0641
VALVE GP
CHECK, SOL
1 WAY / 2 WAY
EC3
297-0370
VALVE GP
CHECK
239-9036
VALVE GP
RELIEF
239-8984
