Click here to view the
Schematic Symbols
and Definitions page
INTERACTIVE SCHEMATIC
The Bookmarks panel will allow you to
quickly navigate to points of interest.
Click on any text that is BLUE and
underlined. These are hyperlinks
that can be used to navigate the
schematic and machine views.
When only one callout is showing on a
machine view, clicking on this button will
make all of the callouts visible. This
button is located in the top right corner
of every machine view page.
VIEW ALL CALLOUTS
Cover Page
Tables
Schematic
Machine Views
Component
Connector
Chassis View
Cab View
Engine View
Features
Options
Bookmarks
X
EC-C3
EC-C2
E-C60
EC-C1
E-C61
To set your screen resolution do the following:
RIGHT CLICK on the DESKTOP.
Select PROPERTIES.
CLICK the SETTINGS TAB.
MOVE THE SLIDER under SCREEN RESOLUTION
until it shows 1024 X 768.
CLICK OK to apply the resolution.
*This document is best viewed at a
screen resolution of 1024 X 768.
*Due to different monitor sizes and PDF reader preferences
there may be some variance in linked schematic locations
FUNCTION
Zoom In
HOTKEYS (Keyboard Shortcuts)
Zoom Out
Fit to Page
Hand Tool
“CTRL” / “+”
KEYS
“CTRL” / “-”
“CTRL” / “0” (zero)
“SPACEBAR” (hold down)
Find
“CTRL” / “F”
Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch
Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
(Adjustable)
Variability
Fluid
Conditioner
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
Click here to save a copy of
this interactive schematic
to your desktop
SCHEMATIC SYMBOLS AND DEFINITIONS
HYDRAULIC SYMBOLS - ELECTRICAL
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical
Wire
Pressure
Switch
M
Electric
Motor
Pressure Switch
(Adjustable)
Temperature
Switch
Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch
Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
Control
Valves
Restriction
Line Restriction
(Fixed)
2-Section
Pump
MAIN
AUX.
Spring
(Adjustable)
Variability
Line Restriction
(Variable)
Pressure
Compensation
Pump: Variable and
Pressure Compensated
Hydraulic Pneumatic
Energy Triangles
Fluid
Conditioner
Attachment
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
Line Restriction
Variable and Pressure
Compensated
Vented Pressurized Return Above Fluid Level Return Below Fluid Level
FLUID STORAGE RESERVOIRS
Pressure
Temperature
Flow
MEASUREMENT
Unidirectional
Bidirectional
ROTATING SHAFTS
One Position
Two Position
Three Position
Two-way
Three-Way
Four-Way
ENVELOPES
PORTS
CONTROL
Basic
Symbol
Spring
Loaded
Normal Position
A B
P T
A B
P T
Shifted Position
Infinite Position
Shuttle
Pilot
Controlled
VALVES
CHECK
Solenoid
or Manual
Solenoid
and Pilot
Solenoid and
Pilot or Manual
Solenoid
Servo
Thermal
Detent
COMBINATION CONTROLS
T
Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it.
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.
Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.).
No circle indicates that the wire cannot be disconnected from the component.
Ground (Wired): This indicates that the component is connected to a grounded wire.
The grounded wire is fastened to the machine.
Ground (Case): This indicates that the component does not have a wire connected to ground.
It is grounded by being fastened to the machine.
Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of
a normally open reed switch; it opens the contacts of a normally closed reed switch.
Sender:
A component that is used with a temperature or pressure gauge.
The sender measures the temperature or pressure.
Its resistance changes to give an indication to the gauge of the temperature or pressure.
Relay (Magnetic Switch):
A relay is an electrical component that is activated by electricity.
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.
Solenoid:
A solenoid is an electrical component that is activated by electricity.
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.
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
when current flows through them. It also has an internal switch that places
the latch coil circuit open at the time the coil latches.
BASIC ELECTRICAL COMPONENT SYMBOLS
Push-pull Lever PedalGeneral Manual Push Button SpringManual Shutoff
MANUAL CONTROL
External Return
Internal Return
Simplified
Complete
Internal
Supply Pressure
RELEASED PRESSURE
REMOTE SUPPLY PRESSURE
PILOT CONTROL
Spring Loaded
Gas Charged
ACCUMULATORS
Crossing
Joining
LINES
Double Acting
Single Acting
CYLINDERS
Unidirectional
Bidirectional
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT
NON- COMPENSATED
PUMPS
Unidirectional
Bidirectional
Unidirectional
Bidirectional
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT
NON- COMPENSATED
MOTORS
Unidirectional
Bidirectional
Two
Position
Infinite
Positioning
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
Three
Position
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
1
2
AG-C4
111-7898
L-C12
3E-5179
9X-1123
Component
Part Number
Pin or Socket Number
Part Number: for
Connector Plug
Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...)
Plug
325-AG135 PK-14
Wire Color
Wire Gauge
Receptacle
1
1
2
2
Sure-Seal connector: Typical representation
of a Sure-Seal connector. The plug and receptacle
contain both pins and sockets.
Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
sockets and the recept
acle contains all pins.
Fuse (5 Amps)
5A
Harness identification code:
This example indicates wire group 325,
wire 135 in harness "AG".
L-C12
3E-5179
Wire, Cable, or Harness Assembly Identification:
Includes Harness Identification Letters and Harness
Connector Serialization Codes (see sample).
Harness Connector Serialization Code: The "C" stands for
"Connector" and the number indicates which connector in the
harness (C1, C2, C3, ...)
HARNESS AND WIRE SYMBOLS
UENR2308
May 2012
416F Backhoe Loader
Hydraulic System
KSF1-UP
LWT1-UP
Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved
COMPONENT AND TAP TABLE
Description
Part
Number
Machine
Location
Schematic
Location
IMPLEMENT PUMP GP 307-3069 1
B-4
HYDRAULIC TANK 358-9301 2 A-5
TANK GROUP 351-5888 3 A-5
HYDRAULIC COOLER 337-9751 4 B-4
HYDRAULIC FILTER 359-7232 5 B-3
HMU 341-7654 6 C-6
STEER CYL-FRONT 217-5097 7 B-6
LH: 358-5034
RH: 358-5035
TILT CYL (ST) 358-5044 9
B-8
MP BUCKET CYL (OPT) 185-1839 11 A-8
F-6
F-3
432F (14FT): 320-6520
432F (16FT), 444F: 320-6522
432F (14FT): 320-6521
432F (16FT), 444F: 320-6523
LH: 381-8055
RH: 381-8054
BUCKET CYL 320-5937 16
F-4
E-STICK CYL (OPT) 320-5935 17 F-3
ACCUMULATOR (PILOT) 226-0420 18 D-5
RIDE CNTRL VALVE (OPT) 245-8780 19 C-8
RIDE CNTRL ACC (OPT) 382-8033 20 C-8
RIDE CNTRL SENSOR (OPT) 344-7391 21 C-8
2 BANK: 359-7201
3 BANK: 359-7203
6 BANK: 359-7202
7 BANK: 359-7204
8 BANK: 359-7206
F-3
F-6
BOOSTED BRAKE VALVE 220-8226 37 D-3
PRV (BRAKE) MANIFOLD (NOT SHOWN) 373-6966 38 D-5
359-7213 31STAB CHECK VALVE
B-8
12320-5938STABILIZER CYL
F-4
15 F-5SWING CYL
STICK CYL 14
COMPONENT LOCATIONS
8LIFT CYL
13
F-6BOOM CYL
26
C-7LOADER VALVE (ST)
BACKHOE VALVE 28
F-7
(NOT SHOWN)
= Graphic not avalible at time of publication.
Tap Number Description
Schematic
Location
T1
PUMP DISCHARGE PRESSURE C-5
T2 RIGHT REAR SERVICE BRAKE C-4
T3 REAR PARK BRAKES C-5
TAP LOCATIONS
Pressure, Sampling, Sensor
UENR3237-00
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.
SCHEMATIC PART NUMBER: 362-9207, CHANGE: 01, VERSION: -
416F BACKHOE LOADER HYDRAULIC SYSTEM SCHEMATIC
MEDIA NUMBER: UENR2308
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
MAIN PUMP OUTPUT
LIFT CYLINDER CIRCUIT
BUCKET CYLINDER CIRCUIT
LOAD SENSE CIRCUIT
STEERING CIRCUIT
STICK CYLINDER CIRCUIT
SUPPLY LINE
AUX CIRCUIT
BOOM CYLINDER CIRCUIT
TILT CYLINDER CIRCUIT
MP BUCKET (OPT)
DRAIN / RETURN LINE
STABILIZER CYLINDER CIRCUIT
SWING CYLINDER CIRCUIT
E-STICK CYLINDER CIRCUIT
BOOSTED BRAKE OIL CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
YY
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
351-5888
358-9301
337-9751
307-3063
214-5097
361-6768
220-8226
341-7654
210-7098
291-2682
359-7213
210-7078
381-8054
LH:
RH:
381-8055
291-2681
210-7074
359-7213
6 BANK: 359-7202
HAB
HAA
B8
A8
210-7088
7 BANK: 359-7204
8 BANK: 359-7206
TA
FRONT STEER CYL.
RH STAB
BOOM
SWING
BUCKET
STICK
LH STAB
E-STICK
A4
B4
B3
A6
B6
A1
B1
RS2
RS1
BA
BB
R4
R2
SB
SA
LS1
LS2
EA
EB
A3
LEFT
BRAKE
PEDAL
TO REAR AXLE
LEFT WHEEL
BRAKE
TO REAR AXLE
RIGHT WHEEL
BRAKE
S
U
A2
B2
A5
B5
A7
B7
R
L
T7
P7
L1
L3
RIGHT
BRAKE
PEDAL
AUX
D
DLS
LIFT
TILT
AUX
ACC
R
T
PS
H
LB
LA
TB
LAB
LAA
P
A1
B1
A2
B2
A3
B3
LIFT
TILT
AUX
304-5696
149-0686
245-8780
358-5044
185-1839
149-0686
373-6966
358-5034LH:
358-5035RH:
359-7201
359-7203
T2
T1
(8) CYLINDER - LIFT
(9) CYLINDER - TILT
(11) CYLINDER -
MP BUCKET (OPT)
(26) VALVE - LOADER (ST)
(21) SENSOR -
RIDE CONTROL (OPT)
(20) ACCUMULATOR - OPTIONAL
(19) VALVE - RIDE CONTROL (OPT)
(12) CYLINDER - STAB
(31) VALVE -
CHECK (STAB)
(3) TANK GROUP - FILTER / BREATHER / SIGHT GAGE
(2) TANK - HYDRAULIC
(7) CYLINDER - FRONT STEER
(6) VALVE HMU - LOAD SENSE RELIEF
(13) CYLINDER - BOOM
(1) PUMP GP - IMPLEMENT
(4) COOLER - HYDRAULIC
(5) FILTER - HYDRAULIC
(14) CYLINDER - STICK
(15) CYLINDER - SWING
(16) CYLINDER - BUCKET
(37) VALVE - BOOSTED BRAKE
(12) CYLINDER - STAB
(31) VALVE - CHECK (STAB)
(17) CYLINDER - E STICK
(OPT)
(18) ACCUMULATOR - PILOT
T3
(28) VALVE - BACKHOE
(38) PRV BRAKE - MANIFOLD
FRONT VIEW
9
8
4
VIEW ALL CALLOUTS
BOOM WITH E-STICK
17
VIEW ALL CALLOUTS
UNDER CAB VIEW
T2
T1
37
28
26
21
20
19
7
6
5
3
2
1
VIEW ALL CALLOUTS
REAR MACHINE VIEWS
T3
31
16
15
14
13
12
11
VIEW ALL CALLOUTS
