INTERACTIVE SCHEMATIC

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E-C61

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EC-C1
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ELECTRICAL SYMBOLS BASIC HYDRAULIC

HOTKEYS (Keyboard Shortcuts) COMPONENT SYMBOLS
T

Pressure Temperature Level Flow

Pump

FUNCTION KEYS
Switch Switch Switch Switch Circuit Breaker
or Motor Variability

Click here to view the

Zoom In “CTRL” / “+” Schematic Symbols
Fluid
Conditioner
Spring
(Adjustable)

Zoom Out “CTRL” / “-” and Definitions page

Fit to Page “CTRL” / “0” (zero)

Hand Tool “SPACEBAR” (hold down)
Find “CTRL” / “F”
Search “CTRL” / “SHIFT” / “F”
SCHEMATIC SYMBOLS AND DEFINITIONS

VALVES INTERNAL PASSAGEWAYS PUMPS BASIC HYDRAULIC

ENVELOPES FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
PARALLEL
FLOW
CROSS
FLOW
FIXED DISPLACEMENT
COMPONENT SYMBOLS

One Position Two Position Three Position Unidirectional Bidirectional Pump

Infinite Two Three Variability
Positioning Position Position or Motor
PORTS VARIABLE DISPLACEMENT
NON- COMPENSATED

CYLINDERS Fluid Spring

(Adjustable)
Two-way Three-Way Four-Way Conditioner
Unidirectional Bidirectional
CONTROL
AB AB
Single Acting Double Acting
MOTORS Pressure
FIXED DISPLACEMENT Spring
P T P T Compensation
Normal Position Shifted Position Infinite Position

CHECK
Control
ACCUMULATORS Unidirectional Bidirectional
Valves
Line Restriction
(Variable)
VARIABLE DISPLACEMENT
Basic Spring Shuttle NON- COMPENSATED
Pilot
Symbol Loaded Line Restriction
Controlled Spring Loaded Gas Charged Restriction
(Fixed)

Unidirectional Bidirectional

MAIN AUX.
Line Restriction
PILOT CONTROL 2-Section
RELEASED PRESSURE ROTATING SHAFTS Variable and Pressure
Compensated
Pump

Unidirectional Bidirectional
External Return Internal Return
Attachment Pump: Variable and
REMOTE SUPPLY PRESSURE Pressure Compensated

Internal Hydraulic Pneumatic

Simplified Complete Supply Pressure Energy Triangles

COMBINATION CONTROLS
LINES MEASUREMENT

Solenoid Solenoid Solenoid Solenoid and Servo Thermal Detent Crossing Joining
or Manual and Pilot Pilot or Manual Pressure Temperature Flow

MANUAL CONTROL FLUID STORAGE RESERVOIRS

Push-pull Lever Manual Shutoff General Manual Push Button Pedal Spring Vented Pressurized Return Above Fluid Level Return Below Fluid Level

HYDRAULIC SYMBOLS - ELECTRICAL ELECTRICAL SYMBOLS

G
M T

Pressure Temperature Level Flow

Transducer Transducer Generator Electric Pressure Pressure Switch Temperature Electrical
Switch Switch Switch Switch Circuit Breaker
(Fluid) (Gas / Air) Motor Switch (Adjustable) Switch Wire

BASIC ELECTRICAL COMPONENT SYMBOLS HARNESS AND WIRE SYMBOLS

Wire, Cable, or Harness Assembly Identification:
Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it. Includes Harness Identification Letters and Harness
Connector Serialization Codes (see sample).
Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates
that the component has screw terminals and a wire can be disconnected from it.
AG-C4 L-C12
Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.). 111-7898 3E-5179
No circle indicates that the wire cannot be disconnected from the component. Part Number: for 1
Connector Plug
Ground (Wired): This indicates that the component is connected to a grounded wire. 2
The grounded wire is fastened to the machine.
Plug Receptacle
Pin or Socket Number
Ground (Case): This indicates that the component does not have a wire connected to ground.
It is grounded by being fastened to the machine. Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...)

Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of Harness Connector Serialization Code: The "C" stands for
"Connector" and the number indicates which connector in the
a normally open reed switch; it opens the contacts of a normally closed reed switch.
harness (C1, C2, C3, ...)
L-C12
Sender: A component that is used with a temperature or pressure gauge. 3E-5179
The sender measures the temperature or pressure.
T Its resistance changes to give an indication to the gauge of the temperature or pressure. 5A
Component
Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity. Fuse (5 Amps) 9X-1123 Part Number
It has a coil that makes an electromagnet when current flows through it.
The electromagnet can open or close the switch part of the relay. 325-AG135 PK-14
Harness identification code:
This example indicates wire group 325, Wire Gauge
Solenoid: A solenoid is an electrical component that is activated by electricity. wire 135 in harness "AG". Wire Color
It has a coil that makes an electromagnet when current flows through it.
The electromagnet can open or close a valve or move a piece of metal that can do work. 1 Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
2 sockets and the receptacle contains all pins.
Magnetic Latch Solenoid: An electrical component that is activated by electricity and held latched by a
permanent magnet. It has two coils (latch and unlatch) that make electromagnet 1 Sure-Seal connector: Typical representation
when current flows through them. It also has an internal switch that places of a Sure-Seal connector. The plug and receptacle
2 contain both pins and sockets.
the latch coil circuit open at the time the coil latches.
 UENR3988-02
May 2017

329F and 330F Excavator

Hydraulic System
329F: 330F:
WBA1-UP JFR1-UP
ERL1-UP HBT1-UP
LBN1-UP MBX1-UP

Attachment: Medium Pressure - Electric Control

© 2017 Caterpillar, All Rights Reserved Printed in U.S.A.

COMPONENT LOCATION

Part Machine Schematic

Description
Number Location Location
Accumulator Gp 227-8807
1 B-3
Accumulator Gp (For Canada BC/AL Regulation) 352-6860
Control Gp - Joystick (LH) 323-7948 2 E-3
Control Gp - Joystick (RH) 323-7947 3 E-1
Filter Gp - Oil 188-4145 4 A-4
Filter Gp - Oil (Case Drain) 289-8194 5 A-3
Filter Gp - Oil (Pilot) 158-8987 6 B-3
Motor Gp - Swing 334-9971 7 F-6
Motor Gp - Travel (LH) 215-9952 8 F-4
Motor Gp - Travel (RH) 215-9952 9 F-4
Pump Gp - Hydraulic 339-0514 10 B-2
Sensor Gp - Pressure (Boom Cylinder Head) 344-7390 11 F-6
Sensor Gp - Pressure (Boom Down Control) 344-7390 12 D-3
Sensor Gp - Pressure (Drive Pump) 344-7390 13 A-7
Sensor Gp - Pressure (Idler Pump) 344-7390 14 A-6
Sensor Gp - Pressure (NFC Drive Pump) 344-7390 15 D-7
Sensor Gp - Pressure (NFC Idler Pump) 344-7390 16 D-6
Sensor Gp - Pressure (Swing Control) 344-7390 17 D-1
Swivel Gp 234-4440 18 E-4
Valve Gp - Check (MCV) 389-2477 19 B-8
Valve Gp - Check (Oil Cooler Bypass) 455-3961 20 D-5
Valve Gp - Load Control (Boom) 323-7610 21 A-8
Valve Gp - Load Control (Stick) 335-0200 22 D-5
Valve Gp - Main Control (Heavy Lift) 323-7903
23 D-7
Valve Gp - Main Control (STD) 323-7907
Valve Gp - Pilot (Travel) 369-8502 24 F-2
Valve Gp - Pilot (Manifold) 215-5037 25 C-3
Valve Gp - Pressure Reducing (Boom Priority) 352-7065 26 C-2
Valve Gp - Shuttle (Cab) 323-7560 27 D-3
Valve Gp - Swing Cushion 322-8716 28 F-6
Valve Gp - Travel Couterbalance (LH) 322-8714 29 E-5
Valve Gp - Travel Couterbalance (RH) 322-8714 30 E-4
Attachment: Medium Pressure - Electric Control
Pump Gp - Medium Pressure 448-3702 31 B-3
Valve Gp - Control (Medium Pressure) 310-0165 32 F-8
Valve Gp - Solenoid (Medium Pressure) 259-7430 33 D-4

Note: Check Part Number In The Part Manual For Your Specific Machine.
TAP LOCATION

Tap Schematic
Description
Number Location
AA Drive Pump Pressure A-3
BB Idler Pump Pressure B-3
CC Idler NFC Pressure B-2
DD Drive NFC Pressure A-2
EE Power Shift Pressure B-1
FF Boom Regeneration Pressure B-8
GG Pump Case Drain Pressure B-2
HH Att Stem 3 Extend EPRV Pressure D-4
II Att Stem 3 Retract EPRV Pressure D-4
JJ Medium Pump Pressure E-7
PG Pilot Pressure A-3
SOS Oil Sampling Port A-3
 8 7 6 5 4 3 2 1
SWING MOTOR TRAVEL MOTOR (LEFT) (7) MOTOR GP TRAVEL MOTOR (RIGHT)
SWG
PRKG BK TRAVEL (LH)
BUCKET CYLINDER STICK CYLINDER BOOM CYLINDER TP (24) VALVE GP
CONTROL PG 215-9952 IDENT CONNECTOR
PILOT (TRAVEL)
(8) MOTOR GP
TT 369-8502 1 LEFT TRAVEL PRESS SW NOTE A
SWG DR 2 RIGHT TRAVEL PRESS SW NOTE A
TRAVEL (RH) TRAVEL(R)
MOTOR TRAVEL(L)
215-9952 3 IMPLEMENT PRESS SW NOTE A
DRAIN
MU
MU 12 PS PRESS EPRV
F 13 BOOM REGEN REPRV F
(7) MOTOR GP AG BG 15 NFC 1 LIMIT EPRV
Pp3 Pp3
L5 R5 L6 SP2 SWING 16 NFC 2 LIMIT EPRV
334-9971 17 SWING BRAKE SOL
(11) SENSOR GP A1 DR B1 T1 T1
(32) VALVE GP R3 BP2 PRESSURE (BOOM CYLINDER HEAD) (FWD) (BKWD) (BKWD) (FWD) 18 TRAVEL SPEED CHANGE SOL
CONTROL (MEDIUM PRESSURE) 344-7390 T2 T2 T5 T1 T3 T6 T4 19 STRAIGHT TRAVEL SOL
T2
310-0165
T2 pR1f pL1f pL2b pR2b 20 HYD LOCK SOL
(28) MOTOR GP
21 SWING PRIORITY VALVE
SWING CUSHION
322-8716 1 2 22 HEAVY LIFT SOL
BG NOTE A NOTE A
AG BG AG
(EXT) (RET) 55 ATT STEM 3 RETRACT EPRV
Pa1 Pb1
56 ATT STEM 3 EXTEND EPRV
PD-Dr
(R) A B (L) 5 6 3 2
4 1
L4 R4
(RET) B1
A B B A
(29) VALVE GP 4 1
(30) VALVE GP
(EXT) A1 TRAVEL COUTERBALANCE (LH) 5 6 3 2
TRAVEL COUTERBALANCE (RH) PD-Pi
E 322-8714 322-8714 E
(BKWD) (FWD) (BKWD) (FWD)
JLP JRP
P L1 R1 L2 R2 (2) CONTROL GP (3) CONTROL GP
PLS M.P.V-P JLT JRT
2 SPEED JOYSTICK (LH) JOYSTICK (RH)
TRAVEL 323-7948 323-7947
T1 PPS STICK SWING BUCKET BOOM
M.P.V-T CONTROL
SWG (18) SWIVEL GP
DRAIN
MOTOR 234-4440
FILTER
JJ R.C.V-D DRAIN

(OUT) (IN) (R) (L) (OPEN) (CLOSE) (DOWN) (UP)

(15) SENSOR GP (16) SENSOR GP (20) VALVE GP JL1 JL3 JL2 JL4 JR2 JR4 JR1 JR3
PRESSURE (NFC IDLER PUMP) C
(23) VALVE GP PRESSURE (NFC DRIVE PUMP) CHECK (OIL COOLER BYPASS) M.P.V-T
MAIN CONTROL 344-7390 344-7390 455-3961
323-7907 (STD) NFC-Dr NFC-Pi
323-7903 (HEAVY LIFT)
NFC-S1 NFC-Dr1 NFC-Dr2 NFC-S2
B
NFC1 15 16 NFC2

Pa1 Pb1
E (27) VALVE GP A1 A2 A3 A4 A5 A6 A7 A8
D D
(22) VALVE GP
HH II (33) VALVE GP
SHUTTLE (CAB)
323-7560
LOAD CONTROL (STICK) SOLENOID (MEDIUM PRESSURE)
A 335-0200 259-7430
MU A2 B2 A1 B1
T
(EXT) (RET)
SDr
56 55 B1 C1 B2 B3 C2 B4 C3 B5 B6 B7 C4 B8
L6 SPi
pL5f pR4b
pL4b
P (12) SENSOR GP
SP2 PRESSURE (BOOM DOWN CONTROL) 3 (17) SENSOR GP
R6 T 344-7390 PRESSURE (SWING CONTROL)
pBR pR5f NOTE A pR6f SPi 344-7390
SP1
SOL3-T
pL3b pR5b pSR
ST6 ST
BPi pL3f pR3B
pL6f
(IN) pSR 2 SPEED pL5b
STICK(2) pR3f
TRAVEL
PD-Pi
pR6f CONTROL
(OUT) NFC-Dr
L5
C pST MF-P MF-TANK NFC-Dr C
R5 (26) VALVE GP
PRESSURE REDUCING (BOOM PRORITY)
pR5f P2 Pi1 P-IN DR1 PSA1 T-OUT2 DR2 352-7065
(OPEN) B
(CLOSE) PSA2
pL5f pR5b 18 20 (25) VALVE GP
(OUT)
STICK(1) PILOT (MANIFOLD)
BUCKET 17 P A
215-5037 pL6f
(IN)
pL5b
NFC-Pi
L4 T
(R) RDr PAC (1) ACCUMULATOR GP
21 P1 227-8807
pL4b PRV-T
352-6860 (FOR CANADA
R4 BC/AL REGULATION)
BRG
FF 13 (L)
pR4b DR3 DR4 Pi2 DR5 T-OUT1 DR6 BB (10) PUMP GP
(UP)
pL3b
SWING
HYDRAULIC
339-0514
CC LINE PATTERNS
BDr M2
(19) VALVE GP Pressure Line
(UP) pBR PD-Dr Pn2
CHECK (MCV) pL3f NFC2 Pilot / Load Sensing Pressure
B 389-2477 PRV-T SWG
SOL3-T M.P.V-P B
BT3 R3 PRKG BK Drain / Return Lines
(31) PUMP GP Ps2
CONTROL
BT MEDIUM PRESSURE Component Group
MF-P 448-3702 P2 PsM2
(6) FILTER GP A2
Air Line
BP1 L3 OIL (PILOT) CALLOUTS
158-8987
BP2 pR3b Dr2 EE YY Taps (Pressure, Sampling, Sensor - by letter)
OUT IN Dr1
BOOM(1) BOOM(2) S1
DL DL D Connectors (By letter)

Callout Number
pR3f
Component

BPi (DOWN) T S3
(Machine Location from
Component LocationsTable)
(52) VALVE GP - CONTROL Name

138-1234 Part Number

DrM
BDr R2
SDr PG HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
(21) VALVE GP pR2b PC PILOT PUMP OUTPUT
(FWD) DRIVE PUMP OUTPUT
LOAD CONTROL (BOOM) TRAVEL(R) dR1b PG SOS PsM1 HEAVY LIFT CONTROL CIRCUIT
323-7610 L2
R1 GG LEFT TRAVEL CONTROL CIRCUIT
POWER SHIFT CONTROL CIRCUIT
A3 SUPPLY LINE

pL2b pR1f RDr P1 Ps1 RIGHT TRAVEL CONTROL CIRCUIT

STICK CYLINDER CONTROL CIRCUIT
(BKWD) (FWD) A1
R.C.V-D NFC1 SWING MOTOR CONTROL CIRCUIT
TRAVEL(L) dR1b MF-TANK Pn1 DRAIN / RETURN LINE

STR-TRAVEL SWING BREAK CONTROL CIRCUIT

L1
AA IDLER PUMP CONTROL CIRCUIT

A TRAVEL SPEED CONTROL CIRCUIT

A
M1 BUCKET CYLINDER CONTROL CIRCUIT

pL1f
(BKWD)
Pi DD RIGHT TRAVEL CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
12 MEDIUM PRESSURE CONTROL CIRCUIT
pST
(5) FILTER GP THIS SCHEMATIC IS FOR THE 329F AND 330F EXCAVATOR HYDRAULIC SYSTEM
dST 19 OIL (CASE DRAIN) ATTACHMENT: MEDIUM PRESSURE - ELECTRIC CONTROL
PUMP-S1 PUMP-S2 289-8194
DRAIN MEDIA NUMBER: UENR3988-02
(13) SENSOR GP FILTER SCHEMATIC PART NUMBER: 337-8428, CHANGE: 02, VERSION: HE
(14) SENSOR GP
PRESSURE (DRIVE PUMP) (4) FILTER GP NOTE A: SCHEMATIC PART NUMBER: 497-8637, CHANGE: 00, VERSION: HE
344-7390 PRESSURE (IDLER PUMP) 319-4407 PRESSURE SWITCH FOR SERIAL NUMBERS 1 - 10000 Components are shown installed on a fully operable machine with the key and engine off, with parking brake set.
P1 344-7390 P2 OIL (TANK) 454-5075 PRESSURE SWITCH FOR SERIAL NUMBERS 10001 - UP Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
188-4145 Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.

8 7 6 5 4 3 2 1
CAB - TOP VIEW
VIEW ALL CALLOUTS

2 24 3

17 27 12
MACHINE - TOP RIGHT VIEW
VIEW ALL CALLOUTS

32 JJ HH 7

II
28

NOT
SHOWN

11
33

18

29
9
30
MAIN CONTROL VALVE
REAR 23
VIEW ALL CALLOUTS

15 16

19 20
26

14
13

FF

22 21

25
FRONT
PUMP GP - RIGHT SIDE VIEW

5 6
VIEW ALL CALLOUTS
10 GG 4

EE

AA

DD

CC

31 BB SOS PG