RENR7782-00
20 Page, B/W, DGM
©
2004 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR7782
January 2004
416D and 424D Backhoe Loader
Hydraulic System
416D:
BGJ1050-Up
424D:
RXA1-UP
CJZ1-UP
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
PEDAL
GENERAL 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
AB
PT
AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
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)
3
20
13
21
6
10
2
28
23
33
42
4514
7 8 9 111215161718
19 22
24 27 29 30
25 26
35
3938
41
31
43
40
37
48
47
46
45
52
51
50
49
56
55
54
53
416D, 424D SINGLE TILT LOADER WITH
CENTER PIVOT OR SIDE SHIFT BACKHOE
57
36
34
44A
44B
32A
32B
Hydraulic Pump (19), Signal Pressure
Test Port (AA)
BB
19
Hydraulic Pump (19), Pump Pressure
Test Port (BB)
AA
19
Pressure Reducing Valve (Stabilizer) (52),
Pilot Oil Pressure Test Port (CC)
CC
52
SECTION B-B
SECTION C-C
LEFT SIDE VIEW
C
C
B
B
4
5
4
14
RIDE CONTROL
Ride Control
Solenoid
976-OR
200-BK
Ride Control
Pressure Switch
F738-WH
200-BK
Accumulator (4) , Pressure Switch (14), Ride Control Valve (5)
Backhoe Valve (50, 51 or 52) , Side Shift Clamp Valve (45)
Side Shift
Lock Solenoid
H771-BR
200-BK
50
45
51 52
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
AA PUMP SIGNAL PRESSURE TEST PORT C-9
BB PUMP PRESSURE TEST PORT B-9
CC PILOT PRESSURE TEST PORT E-5
Description Media Number
420D Backhoe Loader (BKC) SEBP3583
420D Backhoe Loader (BMC) SEBP3584
432D Backhoe Loader (WEP & TDR) SEBP3971
442D Backhoe Loader (TBD & SMJ) SEBP3967
Specifications: (Hydraulic & Steering System) RENR7778
Testing and Adjusting: (Hydraulic & Steering System) RENR7779
Specifications: (Axles, Differentials & Brakes) RENR7776
Testing and Adjusting: (Axles, Differentials & Brakes) RENR7777
Schematic: (Electrical system) RENR7781
Related Manuals
Parts Manual
Machine System
Electrical System
Item
Part
Number
Description
Schematic
Location
1 178-7480 Back Pressure Check Valve (Return Oil) D-11
2 167-4235 Steering Cylinder E-10
3 238-8550 Metering Pump D-10
4
162-3960
Ride Control Accumulator E-9
5
190-8315
Ride Control Solenoid Valve D-9
6
206-3553
Tilt Cylinder E-9
7
9T-0704
Line Relief Valve for Head End of Tilt Cylinder E-8
8
9T-0704
Line Relief Valve for Rod End of Tilt Cylinder E-8
9
124-8818
Auxiliary Control Valve E-8
10
185-1839
Multipurpose Bucket Cylinder (If Equipped) F-8
11
188-7471
Auxiliary Relief Valve F-8
12
168-0361
Loader Tilt Control Valve D-8
13
206-3549
Loader Lift Cylinders D-8
14
131-9203
Pressure Switch D-9
15
130-6520
Loader Lift Control Valve D-8
16
188-7471
Steering Priority Valve C-8
17
185-5906
Two Bank Vavle for Loader C-8
18
185-5907
Three Bank Valve for Loader C-8
19
180-9588
Piston Pump C-10
20
240-9716
Hydraulic Tank C-11
21* ----- Hydraulic Oil Cooler C-11
22
143-0421
Hydraulic Oil Filter D-11
23
185-5902
Pilot Valve E-7
24
192-0827
Stabilizer Control Valve E-5, E-4
25
206-0520
Stabilizer Cylinder F-4
26
206-0522
Stabilizer Cylinder F-3
27
192-0827
Stabilizer Control Valve E-3
28
186-3629
Return Manifold E-7
29
185-5898
Stabilizer Contol Valve (Two Bank) D-6
30
239-2226
Pressure Reducing Valve D-6
31
179-5593
Lockout Solenoid Valve (If Equipped) C-7
32A
202-2236
Side Shift Bank Valve Cover (If Equipped) C-7
32B
200-0161
Center Pivot Bank Valve Cover (If Equipped) A-8
33
206-3628
Boom Cylinder C-6
34
6E-6285
Line Relief for Rod End of Boom Cylinder C-6
35
191-8161
Swing Cylinders C-5
36
137-9466
Line Relief For Rod End of Swing Cylinder C-5
37
187-0524
Line Relief for Head End of Backhoe Bucket Cylinder C-4
38
206-0518
Backhoe Bucket Cylinder C-4
39
206-0514
Backhoe Bucket Cylinder (Extendable Stick) C-4
40
9T-0704
Line Relief Valve for the Head End of Stick Cylinder C-3
41
206-0503
Stick Cylinder C-3
42
191-7725
Extendable Stick Cylinder (If Equipped) C-2
43
190-3450
Extendable Stick Control Valve (If Equipped) C-2
44A
6E-4158
Side Shift Bank Valve Cover (If Equipped) C-1
44B
193-9189
Center Pivot Bank Valve Cover (If Equipped) A-2
45
3E-8622
Side Shift Valve C-1
46
190-3402
Stick Control Valve B-3
47
6E-6281
Line Relief for Rod End of Stick Cylinder B-3
48
190-3400
Backhoe Bucket Control Valve B-4
49
187-0527
Line Relief for Rod End of Backhoe Bucket Cylinder B-4
50
180-8592
Backhoe Control Valve (Four Bank) B-4
51
180-8593
Backhoe Control Valve (Five Bank) (Attachment) B-4
52
180-8594
Backhoe Control Valve (Six Bank) (Attachment) B-4
53
166-7950
Swing Control Valve B-5
54
190-3397
Boom Control Valve B-5
55
6E-6284
Line Relief for Head End of Boom Cylinder B-6
56
190-3450
Auxilary Control Valve (If Equipped) B-6
57
206-3685
Swing Cushion Crossover Relief Valve (If Equipped) C-4
58
203-5489
Backhoe Control Vavle (Four Bank) (Attachment - TUV) B-4
59
203-5490
Backhoe Control Valve (Five Bank) (Attachment - TUV) B-4
60
203-5533
Backhoe Control Valve (Six Bank) (Attachment - TUV) B-4
61
185-5901
Pilot Valve (Two Bank) (Pilot Lever with Switch) E-7
62
191-4010
Outlet Cover F-8
63*
-----
Steer Cylinder (AWD) E-10
64
178-7481
Back Pressure Check Valve (Hammer Option) D-11
Component Locations
* Part number not available at time of publication.
RENR7782-00
20 Page, B/W, DGM
A
C
D
E
F
B
8
9
10
11
89
10
11
1
2
3
4
5
6
7
1
23
4
56
7
A
B
C
D
E
F
57
45
39
33
35
38
41
42
43
40
36
34
48
47
46
49
53
54
55
56
30
UP
DOWN UP
DOWN
STABILIZER STABILIZER
27
25
26
51
50
58
AUX BOOM SWING BUCKET STICK E-STICK
44A
23
61
28
32A
60
59
52
29
24
37
H
PUMP
22
21
20
19
3
14
5
16
15
12
13
8
11
10
2
9
17
18
6
LIFT
TILT
AUX
1
63
64
4
62
7
HMU
44B
32B
THIS SCHEMATIC IS FOR THE 416D, 424D Backhoe Loader
Part #: 201-6837 CHG01
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Main Pump Output.
Load Sense Circuit.
Supply Line.
Drain / Return Line.
Hand Metering Unit Control Circuit.
Lift Cylinder Control Circuit.
Auxiliary Control Circuit.
Tilt Cylinder Control Circuit.
Pilot Shutoff Control Circuit.
Bucket Cylinder Control Circuit
Boom Cylinder Control Circuit.
Swing Cylinder Control Circuit.
Bucket / E-Stick Control Circuit.
Stick Cylinder Control Circuit.
Stabilizer Cylinder Control Circuit.
Stabilizer Cylinder Control Circuit.
E-Stick Cylinder Control Circuit.
31
BB
AA
CC
