KENR7657-01
24 Page, (Dimensions: 34 inches x 28 inches)
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
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
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
T
©
2010 Caterpillar
All Rights Reserved
Printed in U.S.A.
KENR7657-01
February 2010
416E Backhoe Loader
Hydraulic System
BWC1-UP
C-1
34
(A) Extendable Stick Control Valve
(B) Stick Control Valve
(C) Bucket Control Valve
(D) Swing Control Valve
(E) Boom Control Valve
(F) Auxiliary Control Valve
(G) Middle Inlet Manifold
(H) Left Stabilizer Control Valve
(J) Right Stabilizer Control Valve
(K) Solenoid for the Sideshift Lock
K
A
B
C
D
E
F
G
H J
BACKHOE VALVE
29
The 416E is equipped with a
mechanically controlled backhoe
valve that is visible with the floor
plate at the rear of the cab
removed.
IMPLEMENT / STEERING PUMP
The implement and steering pump
on the 416E 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 steering pump
supplies oil flow to the loader valve
group, backhoe valve group, and
steering system.
These illustrations show the implement and steering pump out
of the machine. The following components are visible:
Pressure Cutoff (A), Flow compensator (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
COMPONENT LOCATIONS
2
1
5 6
5
4
4
6
2
1
7
7
8
8
8
9
9
9
10
10
10
11B
11A
13
12
121315
15
14
14
14
16
16
19
192021
202117
17
29
29
34
Tap Description
T1 Pump Discharge
T2 Load Sense
SOS Oil Sampling
TAP LOCATIONS
NOTE: Alpha numeric numbers are represented by the number only on the machine views.
Hydraulic Oil Filter
11B 11A
NAME PART NUMBER
SCHEMATIC
LOCATION
MACHINE
LOCATION
PUMP - GP. 296-6714 B-3 1
HYDRAULIC TANK 297-1233 A-3 2
TANK GP. 297-1232 A-3 3
COOLER 214-2202 C-1 4
FILTER 210-6243 5
HMU 247-7868 B-4 6
CYLINDER -
FRONT STEER 214-5097 A-4 7
CYLINDER - LIFT 215-7298 B-8 8
CYLINDER - TILT 206-3553 B-8 9
CYLINDER - MP BUCKET OPTION 185-1839 A-8 10
LH: 291-2682 F-7 11A
RH: 291-2681 F-6 11B
CYLINDER - BOOM 246-9885 F-4 12
CYLINDER - STICK 210-7077 F-2 13
CYLINDER - SWING 269-0381 F-3 14
CYLINDER
- BUCKET 210-7085 F-3 15
CYLINDER - E-STICK 210-7097 F-1 16
VALVE - RIDE CONTROL (OPT) 245-8780 C-8 19
ACCUMULATOR - RIDE CONTROL (OPT) 162-3960 D-8 20
SWITCH - RIDE C
ONTROL PRESSURE (OPT) 304-5696 C-8 21
VALVE - SHUTTLE 8J-6875 D-7 34
2 BANK 248-0481 D-6 27
3 BANK (SHOWN ON SCHEMATIC) 248-0482 D-6 27
INLET MANIFOLD 259-6745 C-6 27A
LIFT SECTION 259-6732 C-6 27B
TILT SECTION 259-6731 B-6 27C
AUXILIARY (AUX) SECTION 259-6729 A-6 27D
6 BANK 248-0
483 F-7 29
7 BANK 248-0484 F-7 29
8 BANK (SHOWN ON SCHEMATIC) 248-0485 F-7 29
BOOM SECTION 259-6739 D-4 29A
SWING SECTION 259-6738 D-3 29B
BUCKET SECTION 259-6737 D-2 29C
STIC
K SECTION 259-6736 D-2 29D
E-STICK SECTION 259-6734 D-1 29E
STABILIZER SECTION x 2 (Left and Right) 259-6746 D-7 29F
AUXILIARY (AUX) SECTION 259-6733 D-5 29G
INLET MANIFOLD 259-6742 D-5 29J
COMPONENT LOCATIONS
CYLINDER - STABILIZER
LOADER VALVE (27)
BACKHOE VALVE (29)
SOS
Implement and
Steering Pump
HYDRAULIC OIL FILTER
SOS
Pressure Switch
5
The 416E machines are 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
27
D
C
B
A
Hydraulic Oil Filter
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.
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
19
B
A
C
D
KENR7657-01
24 Page, (Dimensions: 34 inches x 28 inches)
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT and STEERING PUMP
STEERING CIRCUIT
PILOT PUMP OUTPUT
STICK CYLINDER
E-STICK CYLINDER
LOAD SENSE
SUPPLY LINE
AUX. VALVE
LOADER and BACKHOE LOAD SENSE RELIEF
BOOM CYLINDER
SWING CYLINDER
STABILIZER (STAB) LEFT and RIGHT
BUCKET CYLINDER
LIFT CYLINDERS
TILT CYLINDERS
MP BUCKET CYLINDERS
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
F
A
B
C
D
E
F
1
2
3
4
56
7
8
1
2
3
4
56
7
8
A
B
A
B
C
D
E
F
C
D
E
F
STAB-RH
STAB-LH
AUX.
BOOM
SWING
BUCKET
STICK E-STICK
AUX.
TILT
LIFT
T2
T1
SOS
THIS SCHEMATIC IS FOR THE 416E BACKHOE LOADERS
PART #: 297-5426 CHG 03
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.
BACKHOE VALVE
LOADER VALVE
(1) PUMP GP.
296-6714
(2) HYD. TANK
297-1233
(3) TANK GP.
297-1232
(4) COOLER
214-2202
(5) FILTER
210-6243
(6) HMU
247-2868
(7) CYL. FRONT STEER
214-5097
(8) CYL. LIFT
215-7298
(9) CYL. TILT
214-2202
(4) CYL. MP BUCKET
(OPTION) 214-2202
(11A) CYL. STABILIZER
LH: 291-2682
(11B) CYL. STABILIZER
RH: 291-2681
(12) CYL. BOOM
246-9885
(13) CYL. STICK
210-7077
(14) CYL. SWING
269-0381
(15) CYL. BUCKET
210-7085
(16) CYL. E-STICK
210-7097
(19) VALVE GP.
RIDE CONT. (OPT)
245-8780
(20) ACCUMULATOR
RIDE CONT. (OPT)
162-3960
(21) PRESS. SWITCH
RIDE CONT. (OPT)
304-5696
(34) SHUTTLE VALVE
8J-6875
(27) LOADER VALVE
3 BANK: 248-0481
(27A) INLET MANIFOLD
259-6745
(27B) LIFT SECTION
259-6732
(27C) TILT SECTION
259-6731
(27D) AUX SECTION
259-6729
(29) BACKHOE VALVE
8 BANK: 248-0485
(29A) BOOM SECTION
259-6739
(29B) SWING SECTION
259-6738
(29C) BUCKET SECTION
259-6737
(29D) STICK SECTION
259-6736
(29E) E-STICK SECTION
259-6734
(29G) AUX SECTION
259-6733
(29F) STABILIZER SECTION
259-6746
(29J) INLET MANIFOLD
259-6742
P1
P2
P3
P4
P5
P6
P7
P7
P8
P8
P12
P12
P10
P14
P14
P11
P11 P13 P13
P16
P15
P17
P18
P18
P9
ITEM
SCHEMATIC
LOCATION
DESCRIPTION SPECIFICATIONS
P1 C-6 LS RELIEF LOADER
SYS. PRES. 20800 Kpa
(MARGIN 2200 kPa)
P2 E-6 LS RELIEF BACKHOE
SYS. PRES. 22800 Kpa
(MARGIN 2200 kPa)
P3 B-6 STEERING LS RELIEF 1
7200 kPa
P4 B-7 TILT RE 29000 kPa
P5 B-7 TILT HE 24000 kPa
P6 A-7 LOADER AUX HE 24000 kPa
P7 E-7, E-6 STABI
LIZER RE 24000 kPa
P8 E-2 BUCKET RE and HE 32000 kPa
P9 E-4 BOOM HE 16000 kPa
P10 E-4 BOOM RE 32000 kPa
P11 E-2 STICK HE and RE 26500 kPa
P12 E-3 SWING HE and RE 23000 kPa
P13 E-1 E-STICK
24000 kPa
(HE and RE)
P14 E-4 BACKHOE AUX HE and RE 26500 kPa
P15 C-1 BACK PRESSURE CHECK VALVE 785 kPa
P16 B-1 FILTER BYPASS 345 kPa
P17 B-1 COOLER BYPASS 379 kPa
P1
8 B-4 STEERING CYLINDER RELIEF 23400 kPa
SPECIFICATIONS
* Please refer to KENR7654 for current specifications.
P
