KENR6654
16 Page (Print Size 34 x 24 inches)
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 RESTRICTION
VARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
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
A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
KENR6654
August 2006
414E Backhoe Loader
Hydraulic System
ELB1-UP
©
2006 Caterpillar
All Rights Reserved
Printed in U.S.A.
NOTE: Numbers15A through 15D are represented by the number 15 only on the
machine views.
247-7867
245-8777
214-2202
210-6243
247-7868
214-5097
228-3508
206-3553
185-1839
N/A
285-1170
285-1171
285-1172
285-1187
248-0481
248-0482
259-6732
259-6745
259-6731
259-6729
245-8780
131-9203
162-3960
8J-6875
COMPONENT LIST
Item
Numbe
r
Part
Numbe
r
Description:
1
PUMP GP - PISTON
2
TANK GP - MTG
3
COOLER
4
FILTER
5
PUMP GP - METERING
6
FRONT STEER CYL.
7
LIFT CYL. ST
8
TILT CYL. ST
9
MP BUCKET CYL.
10
AUXILIARY CYLINDER
11
PITCH CYLINDER (3 POINT)
12
TILT CYLINDER (3 POINT)
13
LIFT CYLINDER (3 POINT)
14
IMPLEMENT VALVE GROUP
15
LOADER VALVE
LOADER VALVE (ST) 2-BANK
LOADER VALVE (ST) 3-BANK
15A
LOADER INLET
15B
LOADER LIFT VALVE
15C
LOADER TILT VALVE
15D
LOADER AUXILIARY (MP)
16
RIDE CONTROL VALVE
17
PRESSURE SWITCH
18
RIDE CONTROL ACCMLTR
19
VALVE AS - SHUTTLE
N/A
12A
DUAL TILT CYL OPT. (3 POINT)
Hydraulic Oil Filter
VIEW OF AREA - A
3-Point Hitch
COMPONENT LOCATIONS
Tap Description
T1 Pump Discharge
T2 Load Sense
SOS Oil Sampling
TAP LOCATIONS
HYDRAULIC OIL FILTER
SOS
Pressure
Switch
4
The 414E is equipped with a mechanically
controlled loader valve (A). The loader valve
is accessed from below the floor plate.
The loader control valve group contains an
inlet manifold (B), lift control valve (C), tilt
control valve (D), and auxiliary control valve
(E, if equipped).
LOADER VALVE
E
15
D
C
B
A
IMPLEMENT / STEERING PUMP
The implement and steering pump on the
414E is a similar design and operates the
same as the pump on the "A" Series
machines.
The pump is located below the cab floor
plate. The pump control valve is mounted
on top of the pump and contains a flow
compensator spool and pressure cutoff
spool. The implement and
These illustrations show the
implement and steering pump
out of the machine. The follow-
ing components are visible:
Pressure Cutoff (A), Flow com-
pensator (B), Load sensing
pressure tap (T2), Discharge
pressure tap (T1), Inlet port (C),
Case drain port (D), Hydraulic
Oil Tank (E), Outlet port (F)
A
A
T2
T2
T1
T2
SOS
T1
B
F
C
B
D
E
C
D
F
Implement and Steering Pump
1
Travel at high speeds over rough terrain causes bucket movement. The optional Ride Control System acts as a
shock absorber by absorbing bucket forces, which stabilize the machine.
The Ride Control System components include; ride control relay (A), ride control solenoids (B), ride control
accumulator (C), and ride control pressure switch (D).
Two solenoids are now used on the "E" Series machines Ride Control System.
RIDE CONTROL
16
B
A
C
D
The hydraulic oil filter is located below the machine at the left frame rail. The
hydraulic oil filter bypass switch is mounted to the oil filter base.
K
A
B
C
D
E
F
G
H
J
IMPLEMENT VALVE
14
(G) Control valve for the Tilt
(H) Control valve for the Lift
(J) B port
(K) Load signal port
(L) Handle for the manual override
(A) Pump port
(B) Inlet manifold
(C) Tank port
(D) A port
(E) Control valve for the Auxiliary
(F) Control valve for the Pitch
L
L
A
TILT
PITCH
LIFT
2
14 5
3
6
7
8
912
11
1413 1617181519
INLET PORT
STEERING PORT
TANK PORT
LOAD SENSE
WORK PORTS
DUAL TILT
CYLINDER
OPTION
KENR6654
16 Page (Print Size 34 x 24 inches)
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT and STEERING PUMP
STEERING CIRCUIT
E-STICK CYLINDER
LOAD SENSE
SUPPLY LINE
PITCH CYLINDER (IMPLEMENT VALVE)
DUAL TILT CYLINDERS (IMPLEMENT VALVE)
AUXILIARY CYLINDER (IMPLEMENT VALVE)
LIFT CYLINDER (IMPLEMENT VALVE)
LIFT CYLINDERS (LOADER VALVE)
TILT CYLINDER (LOADER VALVE)
MP BUCKET CYLINDERS (LOADER VALVE)
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
3
4
56
7
8
3
4
56
7
1
2
A
B
C
D
E
A
B
C
D
E
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
A
B
A
B
C
D
E
C
D
E
THIS SCHEMATIC IS FOR THE 414E SERIES BACKHOE LOADER
PART #: 286-4215 CHG 00
Components are shown installed on a fully operable machine with the key and
engine off and transmission shifter in neutral.
Refer to the appropriate Service Manual for Troubleshooting, Specifications
and Systems Operations.
TILT
CYLINDER
LIFT
CYLINDER
15A
15B
15C
15D
5
6
4
3
2
1
T2
T1
17
16
18
7A
8A
9A
10
12A
13
15
SOS
14
11
AUXILIARY
CYLINDER
PITCH
CYLINDER
TILT
CYLINDERS
LIFT
CYLINDER
AUXILIARY
CYLINDER
MARGIN
RELIEF
VALVE
MAIN
RELIEF
VALVE
PRESSURE
REDUCING
VALVE
PILOT
RELIEF
VALVE
LINE RELIEF
and MAKEUP
VALVE
PRESSURE
COMPENSATOR
VALVE
RIDE
CONTROL
VALVE
LOADER SIGNAL
RELIEF VALVE
PRIORITY VALVE
HMU
PUMP GROUP
FLOW COMPENSATOR
PRESSURE
CUT OFF
OIL COOLER
OIL
FILTER
SIGNAL
LIMITER
FLOW
COMPENSATOR
FLOW
COMPENSATOR
RESOLVER
19
LS
LS
NOTE: Single tilt cylinder is
standard. Dual tilt cylinders
are optional.
12
DUAL TILT OPTION
AAA
B
A
B
A
B
A
B
A B
