backhoe 420e y 430e interactivo_sis
TRANSCRIPT
KENR7658-01October 2008
Printed in U.S.A.
420E and 430E Backhoe LoaderHydraulic System
© 2008 Caterpillar, All Rights Reserved
420E:PRA1-UPPHC1-UP
430E:SCD1-UPRLN1-UP
Component Tables
ITEM NAME PART NUMBER SCHEMATIC LOCATION1 PUMP GP. 267-27552 HYDRAULIC TANK 297-12333 TANK GROUP 297-12324 HYDRAULIC COOLER 304-78475 FILTER 226-97476 HMU 210-6240
7 FRONT 214-5097
8A ST 228-35098B PL/IT 228-3505
9A ST 200-71289B PL/IT 192-388410 MP BUCKET CYL.(OPT) 185-1839
11A LH 262-704911B RH 262-7050
268-9050(S)210-7076
13 STICK CYL. 210-7091(S)14 SWING CYL. 278-197115 BUCKET CYL. 210-7095(S)16 E-STICK CYL (OPT). 210-7097(S)
17A VALVE PILOT-BODY 223-471317B LEVER W/DTNT & SWTCH (OPT) 223-471518 ACCUMULATOR 226-042019 RIDE CNTRL VALVE (OPT) 245-878020 RIDE CNTRL ACCMLTR (OPT) 162-396021 RIDE CNTR PRES. SWTCH(OPT) 304-569622 TEMP. SENSOR (OPT) N/A23 DIFF. PRES. SWITCH (OPT) 134-040425 COUPLER VALVE (Volume 2) 231-261526 COUPLER CYLINDER (Volume 2) 190-3085
27 2 BANK 266-255227 3 BANK 266-2553
27A INLET SECTION 269-108027B LIFT SECTION 269-109127C TILT SECTION 269-109227D AUX SECTION 269-109327E OUTLET MANIFOLD 269-1079
28 3 BANK 266-256328B LIFT SECTION 269-108128C TILT SECTION 269-108228D AUX SECTION 269-1083
STEER CYLINDER
VALVE PILOT 2-BANK
LOADER VALVE (ST)
LOADER VALVE (PL/IT)
BOOM CYLINDER12
LIFT CYLINDERS
TILT CYLINDERS
STABILIZER CYLINDERS
Component Table
ITEM NAME PART NUMBER SCHEMATIC LOCATION
29 6 BANK 266-255629 7 BANK 266-255729 8 BANK 266-2558
29A BOOM SECTION 269-106229B SWING SECTION 269-106429C BUCKET SECTION 269-106529D STICK SECTION 269-106329G E-STICK SECTION 269-106629H RH STABILIZER SECTION 269-106129E AUX SECTION 269-106729F OUTLET MANIFOLD 269-105929J INLET MANIFOLD 269-106029K PATTERN SWITCHING VALVE 257-7724
29L LH STABILIZER SECTION 269-1061
30 VALVE GP - CUSHION RELIEF 206-3685 (STD)
31 VALVE GP - PILOT (BACKHOE) 267-2758
32 VALVE GP - PILOT (LOADER) 267-2758
33 MANIFOLD - PILOT 268-0094
BACKHOE VALVES (COMMON)
BACKHOE VALVE (CP)
Component Table Continued
Tap Description Schematic LocationT1 Pump DischargeT2 Load SenseT3 Pilot Pressure
SOS Oil Sampling
TAP LOCATIONS
Pressure Tap Table
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 RESTRICTIONVARIABLE and PRESSURE
COMPENSATED
PRESSURECOMPENSATION
PUMP: VARIABLE andPRESSURE COMPENSATED
ENERGY TRIANGLESHYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONERPUMP or MOTOR
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLSRELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED COMPLETE INTERNALSUPPLY 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 ACTINGSINGLE ACTING
BASICSYMBOL
SPRINGLOADED
CHECK VALVES
TWOPOSITION
INFINITEPOSITIONING
FLOW IN ONEDIRECTION
FLOW ALLOWED INEITHER DIRECTION
THREEPOSITION
CROSSFLOW
PARALLELFLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P TSHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOTCONTROLLED
FLUID POWER SYMBOLS
Hydraulic Symbols (Electrical)
325-AG135 PK-14
Circuit IdentificationNumber
Wire Color Wire Gauge
Harness identification codeThis example indicateswire 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 ColorCircuit Number Identification
B A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer(Fluid)
Transducer(Gas / Air)
G
Generator
Electrical WirePressure Switch
MElectric Motor
Pressure Switch (Adjustable)
Temperature Switch
PressureSymbol
TemperatureSymbol
LevelSymbol
FlowSymbol
Electrical Symbols (Electrical)
T
ELECTRICAL SYMBOLS
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
THIS SCHEMATIC IS FOR THE 420E BACKHOE LOADER (ST)VOLUME 1 of 2 PART NUMBER: 297-5426, CHANGE: 01, VERSION: -Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSIMPLEMENT and STEERING PUMP CIRCUIT
SWING CYLINDER CIRCUIT
STEERING CYLINDER CIRCUIT
PILOT OIL CIRCUIT
BUCKET CYLINDER CIRCUIT
STICK CYLINDER CIRCUIT
LOAD SENSE CIRCUITSUPPLY LINE
AUXILIARY CIRCUIT (BACKHOE VALVE)E-STICK CYLINDER CIRCUIT
BOOM CYLINDER CIRCUITSTABILIZER CYLINDER CIRCUIT
BOOSTED BRAKE OIL CIRCUIT
LIFT CYLINDER CIRCUITTILT CYLINDER CIRCUITAUXILIARY CIRCUIT (LOADER VALVE)
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
STAB RH BOOM STICK SWING BUCKET E-STICK AUX. STAB LH
HMU
PUMP
TANK
BACKHOE VALVE
1
3
2
5
22
23
4
FRONT STEER CYL.
AUX
TILT
LIFT
LOADER VALVE
LEFT JOYSTICK RIGHT JOYSTICKSTABILIZER JOYSTICK
33
BOOSTED BRAKES (REF)
BS BT
LEFT BRAKEPEDAL
RIGHT BRAKEPEDAL
TO REAR AXLE LEFT WHEEL BRAKE
TO REAR AXLE RIGHT WHEEL BRAKE
DEL
27
T3
T2
T1
11B 12 13
14
3315 16
11A
29F29L29E29G29C29B
29K
29A29H29J
18
29
27A
27B
27C
27D
10
A8 A9
21
20
19
17C 17A 31 31
29D
SOS
6
27E
7
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
THIS SCHEMATIC IS FOR THE 420E BACKHOE LOADER ( PL / IT )VOLUME 2 of 2 PART NUMBER: 297-5426, CHANGE: 01, VERSION: -Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSIMPLEMENT and STEERING PUMP CIRCUIT
SWING CYLINDER CIRCUIT
STEERING CYLINDER CIRCUIT
PILOT OIL CIRCUIT
BUCKET CYLINDER CIRCUIT
STICK CYLINDER CIRCUIT
LOAD SENSE CIRCUITSUPPLY LINE
AUXILIARY CIRCUIT (BACKHOE VALVE)E-STICK CYLINDER CIRCUIT
BOOM CYLINDER CIRCUITSTABILIZER CYLINDER CIRCUIT
BOOSTED BRAKE OIL CIRCUIT
LIFT CYLINDER CIRCUITTILT CYLINDER CIRCUITAUXILIARY CIRCUIT (LOADER VALVE)
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
STAB RH BOOM STICK SWING BUCKET E-STICK AUX. STAB LH
HMU
PUMP
TANK
BACKHOE VALVE
11B 12 13
14
3315 16
11A
29F29L29E29G29C29B
29K
29A29H29J
6
1
3
2
5
22
23
4
18
FRONT STEER CYL.
29
AUX
TILT
LIFT
LOADER VALVE
LEFT JOYSTICK RIGHT JOYSTICKSTABILIZER JOYSTICK
33
3117C 17B 17A
BOOSTED BRAKES (REF)
BS BT
LEFT BRAKE PEDAL
RIGHT BRAKE PEDAL
TO REAR AXLE LEFT WHEEL BRAKE
TO REAR AXLE RIGHT WHEEL BRAKE
31
DEL
LOADER JOYSTICK
32
FLOAT RTD
T3
T2
T1
9B
10
26 25
8B
21
20
19
27A
28B
28C
28B
27E28
29D
SOS
7
15
16
13 12 31 33 5 6 3 2 8 4 9 10
26
25
101414 11B
11A
17 32 18
2930
28 1 19 20 8 7 9
Hydraulic Components - Chassis View
29F 29L 29C 29G 29C 29B 29D 29A 29H
29J
(29F) Outlet Manifold(29L) Left Stabilizer Control Valve(29E) Auxiliary Control Valve(29G) Extendable Stick Control Valve(29C) Bucket Control Valve(29B) Swing Control Valve(29D) Stick Control Valve
J
EIGHT BANK VALVE (PILOT OPERATED)
For other bank valve configurations see RENR6487 (Specifications Manual).
(29A) Boom Control Valve(29H) Right Stabilizer Control Valve(J) Pilot On/Off Solenoid Valve(29J) Inlet Manifold(L) A Ports(M) B Ports
L
M
Backhoe Valve (8 Bank)
C
B
H
E
G
C
A
D
D
T2
T1
T2
T2
T1
1
C
A
B
EF
These illustrations show the implement and steering pump (1) out of the machine. The following components are visible:
Torque control adjustment (A), Flow compensator adjustment (B), Load sensing pressure tap (T2), Inlet port (C), Case drain port (D), Torque control solenoid (E), Discharge pressure tap (T1), Torque limiter (F), Outlet port (G), Loader Valve (27).
The implement and steering pump on the 420E/430E machines are similar to the "D" Series machines, but now includes a torque control solenoid (not visible). The torque control solenoid provides an additional pump setting.
The implement and steering pump is located below the floor plate in the cab. The pump control valve (H) contains a torque control spool adjustment screw (B) and a flow compensator adjustment screw (A). The adjustment screws and the load sensing pres-sure tap (T2) are accessible from the cab.
Drain
27
Implement and Steering Pump
SOS
Filter Bypass Switch
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.
Temp Sensor
Filter Bypass Switch
Temp Sensor
SOS
Hydraulic Oil Filter
HYDRAULIC OIL FILTER
SOS Filter Bypass Switch
5
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.
SOS
Temp Sensor
Filter BypassSwitch
Temp Sensor
SOS
The loader valve is accessed from below the floor plate. The loader control valve group contains:
F
NOTE: Machines with a mechanically controlled loader valve or a pilot controlled loader valve use the same inlet manifold.
For other bank valve configurations see RENR6487 (Specifications Manual).
THREE BANK VALVE (PILOT OPERATED)
GH
J K L
M
P
R
N
(27E) Outlet manifold (27D, 28D) Auxiliary control valve (27C, 28C) Tilt control valve (27B, 28B) Lift control valve (27A) Inlet manifold (F) Load sensing relief valve (G) Solenoid for the B circuit (H) Solenoid for the A circuit (J) Makeup and relief valve (K) B pilot line port (L) A pilot line port (M) Priority Valve (N) Dead engine lower valve (P) A ports (R) B ports
27D27A
27C
27B
27
1
2827E
28D
28C 28B27A
Three Bank (Mechanically Controlled)
5
Loader Valve
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 Valve (19), Ride Control Relay, Ride Control Sole-noids, Ride Control Accumulator (20), and Ride Control Pressure Switch (21).
Two solenoids are now used on the "E" Series machines Ride Control System.
The Ride Control System, on machines with the optional autoshift transmission, is controlled by the Machine ECM. The Machine ECM monitors the position of the ride control switch and determines when to operate the ride control system.
21
ECM
Ride Control Relay
20
19
Ride Control (Option)
Ride Control Solenoids
The 420E/430E machines are equipped with hydraulically assisted master cylinders. The brake boost valves are connected to the master cylinder (A) at each brake pedal (B). Oil enters the master cylinder through the supply hose (C) and exits the master cylinder through the return hose (D). The oil flows to the service brakes through the hoses (E) at the bottom of the master cylinder. The master cylinders can be removed from the machine from inside the operator's compartment.
This illustration shows a sectional view of the boosted brake valve group. When the brake pedal is depressed, the boost brake valve moves to the left and inlet oil from the pilot manifold is directed to the master cylinder.
To Wheel Brake
Boost Brake Valve
From PilotAccumulatorTo Tank
Master Cylinder
SlaveCylinder
A BE D C
Boosted Brakes