RENR3568-02 VOL 1
20 Page, RBM
Volume 1: Single Tilt Loader with Side Shift Backhoe
RENR3568-02
October 2004
428D & 438D Backhoe Loader
Hydraulic System
428D:
BLL1-UP
BMT1-UP
BNB1-UP
BNS1-UP
438D:
BPE1-UP
BPN1-UP
©
2004 Caterpillar
All Rights Reserved
Printed in U.S.A.
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
AB
PT
AB
PT
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)
Description
Part
Number
Machine
Location
Schematic
Location
Cooler Gp 154-3799 1 B-12
Cover Gp - Outlet 193-9189 2 B-1
Cover Gp - Steer Priority Valve 191-4010 3 F-8
Cylinder Gp - (ST) Lift 196-4523 4 D-9
Cylinder Gp - Boom 206-3630 5 C-6
Cylinder Gp - Bucket 206-0514 6 C-4
Cylinder Gp - Stabilizer 173-4565 7 F-5
Cylinder Gp - Stabilizer 173-4565 8 F-3
Cylinder Gp - Steer 167-4235 9 F-11
Cylinder Gp - Stick 235-9831 10 C-3
Cylinder Gp - Swing 228-3506 11 C-5
Cylinder Gp - Swing 228-3507 12 C-5
Cylinder Gp - Tilt 206-3555 13 D-9
Filter Gp 178-0094 14 D-11
Pump Gp - Metering, HMU 238-8550 15 E-10
Pump Gp - Piston 235-4110 16 B-10
Tank Gp - Hydraulic 240-9721 17 B-11
Valve Gp - Check, Back Press 178-7480 18 E-11
Valve Gp - Control 202-2236 19 B-7
Valve Gp - Control, Back Hoe 203-5486 20 B-1, B-7
Valve Gp - Control, Boom 204-0532 21 B-6
Valve Gp - Control, Bucket 193-3124 22 B-4
Valve Gp - Control, Lift 130-6520 23 C-9, D-9
188-7471
*185-5911
**185-5912
Valve Gp - Control, Stick 204-0533 26 B-3
Valve Gp - Control, Swing 166-7950 27 B-5
Valve Gp - Control, Tilt 191-4012 28 D-9, E-9
Valve Gp - Stabilizer, Control 222-0364 39 D-3, F-4
Valve Gp - Stabilizer, Control 222-0364 40 D-4, F-6
Valve Gp - Stabilizer, Control 185-5898 42 D-6, E-6
Cover Gp - Inlet 116-1317 43 B-7
Cylinder Gp - E Stick 191-7725 44 C-2
Cylinder Gp - E Stick Bucket 206-0518 45 C-4
Cylinder Gp - MP Bucket 185-1839 46 F-9
Switch As - Differential 134-0404 47 D-11
Valve Gp - Control, Aux 124-8818 48 E-9, F-9
203-5486
*203-5487
**203-5488
Valve Gp - Control, E Stick 190-3450 51 B-2
Valve Gp - Control, Aux 190-3450 52 B-7
185-5908
*185-5909
**185-5910
Valve Gp - Cushion 206-3685 57 C-4, C-5
Valve Gp - Relief 9T-0704 58 F-8
Cylinder Gp - AWD Steer 178-7190 59 F-11
Accumulator Gp - Ride Control 162-3960 60 D-10
Switch As - Pressure 131-9203 61 C-10
Valve Gp - Mounting 222-1684 62 D-10
Filter Gp 224-6812 63 D-12
Component Locations (Volume 1)
24 C-9, F-9
B-1, B-7
Attachments
Ride Control
Optional Filter Assembly For Cab Deluxe
All Wheel Steer
53 B-1, B-7
Valve Gp - Control, Sideshift
(See Note C)
Valve Gp - Control, Steer Priority
(See Note A)
Valve Gp - Control, Back Hoe
(See Note B)
49
15
1
57
19
46
4
95960 61 62
14
16
48
17 23 24
63
47
3
26
2
51
52
49
20 22
21
44
10
13
456
43
78
11 12
39 40
42
18
5
27
53
58
28
17
Machine Component Locations
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
AA Pilot Pressure Test Port E-6
BB Signal Pressure Test Port B-11
CC Pump Pressure Test Port A-11
AA
BB
CC
42
16
16
Hydraulic Pump (16),
Pump Pressure Test Port (CC)
Hydraulic Pump (16),
Signal Pressure Test Port (BB)
Valve Group - Stabilizer, 2 Bank (42),
Pilot Oil Pressure Test Port (AA)
NOTES:
(A) Valve Gp - Control, Steer Priority
*185-5911
**185-5912
(B) Valve Gp - Control, Back Hoe
203-5486
*203-5487
(C) Valve Gp - Control, Sideshift
185-5908
*185-5909
**185-5910
**203-5488
2 Bank Loader
3 Bank Loader
4 Bank
5 Bank
6 Bank
4 Bank Without TUV
5 Bank Without TUV
6 Bank Without TUV
RENR3568-02 VOL 1
20 Page, Color 2, RBM
Stick Cylinder Control Circuit
Stabilizer Cylinder Control Circuit (RIGHT)
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Main Pump Output
Pilot 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
Bucket Cylinder Control Circuit
Boom Cylinder Control Circuit
Swing Cylinder Control Circuit
Bucket / E-Stick Control Circuit
E-Stick Cylinder Control Circuit
Stabilizer Cylinder Control Circuit (LEFT)
A
B
C
D
E
F
A
C
D
E
F
B
8
9
10
1112
89
10
1112
1
2
3
4
56
7
1
23
4
56
7
P
T
T1
CYLINDER GP- STICK
235-9831
CYLINDER GP- E STICK
191-7725
VALVE GP- CONTROL
E STICK 190-3450
VALVE GP- CONTROL
BUCKET 193-3124
VALVE GP- CONTROL
STICK 204-0533
COVER GP- OUTLET
193-9189
CYLINDER GP- SWING
228-3507
S1
S
VALVE GP- CUSHION
CROSSOVER RELIEF
206-3685
ACC
H
R
T
CYLINDER GP-
MP BUCKET
85-1839
PS
CYLINDER GP- E STICK BUCKET
206-0518
CYLINDER GP- BUCKET STD
206-0514
CYLINDER GP- SWING
228-3506
CYLINDER GP- BOOM
206-3630
COVER GP- INLET
116-1317
VALVE GP- CONTROL
SIDESHIFT
185-5908,4BANKWITHOUTTUV
185-5909,5BANKWITHOUTTUV
185-5910,6BANKWITHOUTTUV
VALVE GP- CONTROL
SWING 166-7950
VALVE GP- CONTROL
BOOM 204-0532
VALVE GP- CONTROL
AUX 190-3450
CYLINDER GP- STABILIZER
173-4565
VALVE GP- CONTROL
STABILIZER
222-0364
VALVEGP-2BANK
STABILIZER CONTROL
185-5898
COVER GP- OUTLET
STEER PRIORITY
191-4010
VALVE GP- CONTROL
AUX
124-8818
VALVE GP- CONTROL
TILT 191-4012
VALVE GP- CONTROL
LIFT 130-6520
CYLINDER GP-
TILT 206-3555
CYLINDER GP-
(ST) LIFT 196-4523
VALVE GP- MOUNTING
222-1684
ACCUMULATOR GP-
RIDE CONTROL
162-3960
PUMP GP- METERING
HMU 238-8550
PUMP GP- PISTON
235-4110
TANK GP- HYDRAULIC
240-9721
FILTER GP-
OIL 178-0094
VALVE GP- CHECK
BACK PRESSURE
178-7480
VALVE GP- CONTROL
STEER PRIORITY
188-7471
185-5911, 2 BANK LOADER
185-5912, 3 BANK LOADER
SWITCH AS- PRESSURE
131-9203
FILTER GP
224-6812
SWITCH AS-
DIFFERENTIAL
134-0404
VALVE GP- CONTROL
BACK HOE
203-5486, 4 BANK
203-5487, 5 BANK
203-5488, 6 BANK
VALVE GP- CONTROL
202-2236
COOLER GP-
154-3799
CYLINDER GP- STEER
167-4235
CYLINDER GP- STEER, AWD
178-7190
THIS SCHEMATIC IS FOR THE 428D and 438D SINGLE TILT LOADER WITH SIDE SHIFT BACKHOE
(VOLUME 1)
Part #: 201-6838
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
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
AA
BB
CC
LEFT RIGHT
SOLENOID
3E-8622
RELIEF VALVE
187-0528
RELIEF VALVE
187-0529
RELIEF VALVE
187-0527
RELIEF VALVE
187-0524
RELIEF VALVE
137-9466
RELIEF VALVE
187-0523
RELIEF VALVE
6E-6285
SOLENOID
179-5593
RELIEF VALVE
187-0530
RELIEF VALVE
9T-0704
TEMP. SW.
7N-0758
RENR3568-02 VOL 2
20 Page, RBM
Volume 2: Parallel Lift Loader with Side Shift Backhoe
RENR3568-02
October 2004
428D & 438D Backhoe Loader
Hydraulic System
428D:
BNB1-UP
BLL1-UP
BMT1-UP
BNS1-UP
438D:
BPE1-UP
BPN1-UP
©
2004 Caterpillar
All Rights Reserved
Printed in U.S.A.
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
AB
PT
AB
PT
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)
15
1
57
19
46
4
95960 61 62
14
16
48
17 23 24 25
63
47
3
26 37
2
51 52
20 22
21
44
10
13
456
43
38
78
11
12
39 40
41 42
64
18
5
27
53
5828
17
65
66
67
68
Machine Component Locations
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
AA Pilot Pressure Test Port E-6
BB Signal Pressure Test Port B-11
CC Pump Pressure Test Port A-11
16
16
BB
CC
AA
42
Valve Group - Stabilizer, 2 Bank (42),
Pilot Oil Pressure Test Port (AA)
Hydraulic Pump (16),
Signal Pressure Test Port (BB)
Hydraulic Pump (16),
Pump Pressure Test Port (CC)
NOTES:
(B) Valve Gp - Control, Steer Priority
*185-5913
**185-5914
(A) Valve Gp - Control, Back Hoe
203-5486
*203-5487
(C) Valve Gp - Control, Sideshift
185-5908
*185-5909
**185-5910
**203-5488
2 Bank Loader
3 Bank Loader
4 Bank
5 Bank
6 Bank
4 Bank Without TUV
5 Bank Without TUV
6 Bank Without TUV
Description
Part
Number
Machine
Location
Schematic
Location
Cooler Gp 154-3799 1 B-11
Cover Gp - Outlet 193-9189 2 B-1
Cover Gp - Steer Priority Valve 191-4010 3 F-8
Cylinder Gp - (IT) Lift 192-3791 4 D-9
Cylinder Gp - Boom 206-3630 5 C-5
Cylinder Gp - Bucket 206-0514 6 C-4
Cylinder Gp - Stabilizer 173-4565 7 F-5
Cylinder Gp - Stabilizer 173-4565 8 F-3
Cylinder Gp - Steer 167-4235 9 E-10
Cylinder Gp - Stick 235-9831 10 C-3
Cylinder Gp - Swing 228-3506 11 C-5
Cylinder Gp - Swing 228-3507 12 C-5
Cylinder Gp - Tilt 192-3884 13 D-9
Filter Gp 178-0094 14 C-11
Pump Gp - Metering, HMU 238-8550 15 E-10
Pump Gp - Piston 235-4110 16 B-9
Tank Gp - Hydraulic 240-9721 17 A-10
Valve Gp - Check, Back Press 178-7480 18 E-11
Valve Gp - Control 202-2236 19 B-7
203-5486
*203-5487
**203-5488
Valve Gp - Control, Boom 204-0532 21 B-5
Valve Gp - Control, Bucket 193-3124 22 B-3
Valve Gp - Control, Lift 130-6520 23 C-8, D-8
Valve Gp - Control, Steer Priority 188-7471 24 C-9, F-9
188-7471
*185-5913
**185-5914
Valve Gp - Control, Stick 204-0533 26 B-2
Valve Gp - Control, Swing 166-7950 27 B-4
Valve Gp - Control, Tilt 191-4032 28 D-8, E-8
Valve Gp - Stabilizer, Control 222-0364 39 D-3, F-3
Valve Gp - Stabilizer, Control 222-0364 40 D-5, F-5
Valve Gp - Stabilizer, Control 185-5898 42 D-6, E-6
Cover Gp - Inlet 116-1317 43 B-7
Cylinder Gp - Coupler 178-3713 65 F-9
Cylinder Gp - E Stick 191-7725 44 C-2
Cylinder Gp - E Stick Bucket 206-0518 45 C-4
Cylinder Gp - MP Bucket 185-1839 46 F-9
Motor Gp - Broom 68 F-9
Switch As - Differential 134-0404 47 D-10
Valve Gp - Control, Aux 191-4035 48 E-8, F-8
Valve Gp - Control, Aux 190-3450 52 B-6
Valve Gp - Control, E Stick 190-3450 51 B-1
185-5908
*185-5909
**185-5910
Valve Gp - Cushion 206-3685 57 C-4, C-5
Valve Gp - Manual Shutoff 201-0947 67 E-9
Valve Gp - Mounting Coupler 138-1979 66 E-9
Cylinder Gp - AWD Steer 178-7190 59 E-10
Accumulator Gp - Ride Control 162-3960 60 D-10
Switch As - Pressure 131-9203 61 C-9
Valve Gp - Mounting 222-1684 62 C-10
Filter Gp 224-6812 63 D-11
All Wheel Steer
Optional Filter Assembly For Cab Deluxe
Attachments
Ride Control
20 B-1, B-7
Component Locations (Volume 2)
Valve Gp - Control, Back Hoe
(See Note A)
Valve Gp - Control, Steer Priority
(See Note B)
25 C-8, F-8
Valve Gp - Control, Sideshift
(See Note C)
B-1, B-753
RENR3568-02 VOL 2
20 Page, Color 2, RBM
A
B
C
D
E
F
A
C
D
E
F
B
8
9
10
11
89
10
11
1
2
3
4
56
7
1
23
4
56
7
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Main Pump Output
Pilot 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
Bucket Cylinder Control Circuit
Boom Cylinder Control Circuit
Swing Cylinder Control Circuit
Bucket / E-Stick Control Circuit
E-Stick Cylinder Control Circuit
Stabilizer Cylinder Control Circuit (LEFT)
P
T
T1
S1
S
LS
RS
ACC
H
R
T
PS
COVER GP- OUTLET
193-9189
SOLENOID
3E-8622
VALVE GP- CONTROL
TILT 191-4032
VALVE GP- CONTROL
LIFT 130-6520
MP BUCKET
CYLINDER
185-1839
CYLINDER GP-
COUPLER 178-3713
MOTOR GP-
BROOM
MOUNTING
COUPLER
138-1979
VALVE GP-
MANUAL SHUTOFF
201-0947
CYLINDER GP.
(IY) TILT
192-3884
VALVE GP-
CONTROL RIDE
222-1684
SWITCH AS-
PRESSURE
131-9203
VALVE GP- CONTROL
E STICK 190-3450
VALVE GP- CONTROL
STICK 204-0533
VALVE GP- CONTROL
BUCKET 193-3124
VALVE GP- CONTROL
SIDESHIFT
185-5908, 4 BANK WITHOUT TUV
185-5909, 5 BANK WITHOUT TUV
185-5910, 6 BANK WITHOUT TUV
VALVE GP- CONTROL
SWING 166-7950
VALVE GP- CONTROL
BACK HOE
203-5486, 4 BANK
203-5487, 5 BANK
203-5488, 6 BANK
VALVE GP- CONTROL
BOOM 204-0532
VALVE GP- CONTROL
AUX 190-3450
VALVE GP- CONTROL
202-2236
CYLINDER GP- E STICK
191-7725
CYLINDER GP- STICK
235-9831
RELIEF VALVE
187-0528
CYLINDER GP- E STICK BUCKET
206-0518
CYLINDER GP- BUCKET STD
206-0514
VALVE GP- CUSHION
CROSSOVER RELIEF
206-3685
CYLINDER GP- SWING
228-3507
CYLINDER GP- SWING
228-3506
CYLINDER GP- BOOM
206-3630
COVER GP- INLET
116-1317
CYLINDER GP- STABILIZER
173-4565
VALVE GP- CONTROL
STABILIZER
222-0364
COVER GP- OUTLET
STEER PRIORITY
191-4010
VALVE GP- CONTROL
AUX 191-4035
VALVE GP- CONTROL
STEER PRIORITY
188-7471
185-5913, 2 BANK LOADER
185-5914, 3 BANK LOADER
CYLINDER GP-
(IT) LIFT
192-3791
ACCUMULATOR GP-
CONTROL RIDE
162-3960
PUMP GP-
METERING HMU
238-8550
CYLINDER GP- STEER
167-4235
CYLINDER GP- STEER, AWD
178-7190
VALVE GP- CHECK
BACK PRESSURE
178-7480
SWITCH AS-
DIFFERENTIAL
134-0404
FILTER GP-
178-0094
SWITCH AS-
TEMPERATURE
7N-0758
FILTER GP-
224-6812
TANK GP- HYDRAULIC
240-9721
PUMP GP- PISTON
235-4110
VALVE GP- STABILIZER
CONTROL 185-5898,
2BANK
COOLER GP.
154-3799
THIS SCHEMATIC IS FOR THE 428D and 438D PARALLEL LIFT LOADER WITH SIDE SHIFT BACKHOE
(VOLUME 2) Part #: 201-6838
AA
BB
CC
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Tap s (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.
RELIEF VALVE
187-0529
RELIEF VALVE
187-0527
RELIEF VALVE
187-0524
RELIEF VALVE
137-9466
RELIEF VALVE
6E-6285
RELIEF VALVE
187-0523
SOLENOID
179-5593
LEFT
RIGHT
RELIEF VALVE
197-3124
RELIEF VALVE
187-0532
RELIEF VALVE
9T-0704
TEMP. SW.
7N-0758
PRESSURE REDUCING
VALVE 239-2226
Stick Cylinder Control Circuit
Stabilizer Cylinder Control Circuit (RIGHT)
