FLUID POWER SYMBOLS
KENR8230-01 December 2008
BASIC COMPONENT SYMBOLS
A MAIN AUX.
COMPONENT LIST ITEM
NAME
432E
PUMP or MOTOR
434E
442E
1
PUMP GP.
289-6370
2
HYDRAULIC TANK
246-5286
3
TANK GROUP
4
COOLER
5
FILTER
6
HMU
CONTROL VALVES
SPRING
FLUID CONDITIONER
LINE RESTRICTION (FIXED)
RESTRICTION
PUMP: VARIABLE and PRESSURE COMPENSATED
2-SECTION PUMP
444E
A
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
SPRING (ADJUSTABLE)
VARIABILITY
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
ATTACHMENT
LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED
VALVES
245-8777 VALVE ENVELOPES
HYDRAULIC COOLER
VALVE PORTS
226-9747 210-6240
TWO POSITION
ONE POSITION
TWO-WAY
THREE POSITION
FOUR-WAY
THREE-WAY
STEER CYLINDERS
7
7A
B
N/A
REAR
7B
CONTROL VALVES
N/A
FRONT
8
LIFT CYLINDERS
214-9373
249-6710 LH 249-6711 RH
249-6712 LH 249-6713 RH
9
TILT CYLINDERS
192-3884
210-7101
214-9372
MP BUCKET CYL.(OPT)
10
P T SHIFTED POSITION
P T NORMAL POSITION
MP BUCKET CYL.
N/A
CHECK VALVES
AB
AB
INFINITE POSITION
SHUTTLE
SPRING LOADED
BASIC SYMBOL
MEASUREMENT
PILOT CONTROLLED
ROTATING SHAFTS
STABILIZER CYLINDERS
11
173-4565
11A
LH
11B
RH
12
BOOM CYLINDER
13
STICK CYLINDER
14
SWING
15
BUCKET CYLINDER
16
E-STICK CYLINDER (OPT).
This illustration shows the optional powered sideshift attachment. The powered sideshift moves the backhoe across the slider using two hydraulic cylinders (A). Wear pads (B) on the slider and powered sideshift assembly are serviceable.
173-4565 268-9049(S) 210-7076 210-7083(S) 210-7084 278-1971
268-9051(S) 246-9884 210-7093(S) 210-7094
268-9049(S) 210-7076 210-7083(S) 210-7084
268-9051(S) 246-9884 210-7093(S) 210-7094
210-7085(S) 210-7086
210-7085(S) 210-7095(S) 210-7095(S) 210-7086 210-7096 210-7096 210-7097(S) / 210-7089
CYLINDER
D
PRESSURE
17A
VALVE PILOT (SWITCH)
297-4394
17B
VALVE PILOT (SWITCH+DETENT)
297-4395
18
ACCUMULATOR
226-0420
19
RIDE CNTRL VALVE (OPT)
245-8780
20
RIDE CNTRL ACCMLTR (OPT)
162-3960
432E, 434E, 442E, and 444E Backhoe Loaders Hydraulic System
C
432E: BXE2200-UP
131-9203
21
RIDE CNTR PRES. SWTCH(OPT)
22
TEMP. SENSOR (OPT)
23
DIFF. PRES. SWITCH (OPT)
24
ALL WHEEL STEER VALVE
25
COUPLER VALVE (See Volume 2)
231-2615
26
COUPLER CYLINDER (See Volume 2)
190-3085
27
LOADER VALVE (3 BANK)
27
LIFT SECTION
27B
TILT SECTION
27C
AUX SECTION
27D
INLET SECTION
BIDIRECTIONAL
434E: FSH900-UP
VENTED
RETURN ABOVE FLUID LEVEL
PRESSURIZED
RETURN BELOW FLUID LEVEL
COMBINATION CONTROLS
SOLENOID
442E: GKZ600-UP
SOLENOID or MANUAL
444E: LBE600-UP
SERVO
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
TEMP SENSOR MANUAL SHUTOFF
PUSH-PULL LEVER
134-0404 256-3089 (OPT)
GENERAL MANUAL
256-3089 (STD)
PUSH BUTTON
"E" Series sideshift machines have a new slide frame with new externally serviceable slide frame lock cylinders and reversible/replaceable wear plates (C). The lock cylinders can be serviced in the field with standard tools. The stabilizers (D) are now externally adjustable. A powered sideshift (bottom right illustration) is available, which allows the operator to hydraulically shift the backhoe across the slider.
N/A
269-1081 308-2157
N/A
308-2163
EXTERNAL RETURN
SPRING
N/A
REMOTE SUPPLY PRESSURE
INTERNAL RETURN
SIMPLIFIED
CROSSING AND JOINING LINES
ACCUMULATORS
SIDESHIFT
308-2159 269-1083
PEDAL
PILOT CONTROL SYMBOLS RELEASED PRESSURE
LOADER VALVE (PL/IT) 3 BANK 27A
UNIDIRECTIONAL
FLUID STORAGE RESERVOIRS
VALVE PILOT
17
FLOW
TEMPERATURE
SPRING LOADED
GAS CHARGED
LINES CROSSING
INTERNAL SUPPLY PRESSURE
COMPLETE
HYDRAULIC AND PNEUMATIC CYLINDERS
SINGLE ACTING
LINES JOINING
DOUBLE ACTING
LOADER VALVE (EST) 3 BANK LOADER VALVE (3 BANK)
N/A
293-8702
28A
INLET SECTION
N/A
308-2156
28B
TILT SECTION
N/A
308-2158
To Wheel Brake
To Tank
HYDRAULIC PUMPS
From Pilot Accumulator
FIXED DISPLACEMENT
INTERNAL PASSAGEWAYS
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT NON-COMPENSATED
BACKHOE VALVE (SS) 7 BANK
293-8701
29A
BOOM SECTION
308-2149
29B
STICK SECTION
308-2152
29C
E-STICK SECTION
308-2153
29D
OUTLET SECTION
308-2154
29E
INLET MANIFOLD
308-2147
29F
STABILIZER SECTION
308-2148
29G
SWING SECTION
308-2150
29H
BUCKET SECTION
308-2151
30
PATTERN SWITCH VALVE
300-4491
31
VALVE GP - CUSHION RELIEF (OPT)
206-3685
32
VALVE GP - PILOT (BACKHOE)
267-2758
33
VALVE GP - PILOT (LOADER)
267-2760
34
PRV MANIFOLD
300-4493
35
PO CHECK VALVE
308-3437
36
CHECK VALVE ADAPTER
165-7948
ITEM
TAP LOCATIONS Tap T1 T2 T3 SOS
30 18
LS RELIEF BACKHOE
P3
HMU LS RELIEF
P4
TILT RE
Oil Sampling
P5
TILT HE
P6
LOADER AUX HE
P7
BUCKET RE & HE
P8
BOOM HE
P9
BOOM RE
P10a
STICK HE
P10b
STICK RE
CROSS FLOW
PARALLEL FLOW
FLOW IN ONE DIRECTION
FLOW ALLOWED IN EITHER DIRECTION
Printed in U.S.A.
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.
Electrical Symbols Table Hydraulic Symbols (Electrical)
G Transducer (Fluid)
Transducer (Gas / Air)
M
Generator
Electric Motor
Temp Sensor SIDESHIFT CLAMP SOLENOID VALVE
SOS Filter Bypass Switch
SIDESHIFT CLAMP GAUGE (PLUGGED)
A
SWING RE + HE
P12
E-STICK RE + HE
P13
BACK PRESSURE CHECKVALVE
P14
FILTER BYPASS
P15
COOLER BYPASS
P16
STEERING CYL. RELIEF
P17
REAR WHEEL LINE RELIEF
P18
FLUSHING / MARGIN RELIEF
PR1
PILOT PRESSURE REDUCING
E
D
C
B
The 432E, 434E, 442E and 444E machines are equipped with hydraulically assisted master cylinders, which decreases the amount of pedal effort when braking. This illustration shows the boosted brakes valve group, which uses oil from the pilot accumulator to add boost to the master cylinder. The hydraulic force multiplies the pedal effort so the operator can get more braking force with less effort.
M14x2
9
PUMP (PLUGGED)
Electrical Symbols (Electrical)
HYDRAULIC OIL FILTER
5 T
Pressure Symbol
BOOSTED BRAKES 4
7
Wire Number Identification Codes
TANK (LS DRAIN)
LOAD SENSE RELIEF VALVE
A
31
STAB
STAB
LINE MAKE-UP/ RELIEF VALVE
Loader Valve
Electrical Schematic Example
SOS
Implement and Steering Pump
Harness identification code This example indicates wire 135 in harness "AG".
Current Standard Wire Circuit Number Identification
Loader Valve
STICK
SWING
Hydraulic Schematic Example
Current Standard
Hydraulic Oil Filter
E-STICK
BOOM
13
Flow Symbol
Level Symbol
Temperature Symbol
LOAD SENSE
Implement and Steering Pump
10
Electrical Wire
Temperature Switch
Temp Sensor
Filter Bypass Switch
SOS
The master cylinders can be removed from the machine from inside the operator's compartment.
B
Pressure Switch (Adjustable)
Pressure Switch
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.
22 36 28 8
TANK (PLUGGED)
M14x2
LS DRAIN REGULATOR
2
BIDIRECTIONAL
T3
P11
21 20 19
BIDIRECTIONAL
View of pilot controlled backhoe valve with floor plate removed.
P2
23 27 5
The pilot manifold can also be accessed with the floor plate removed. The pilot pressure tap (T3) is located on the pilot manifold. The pilot manifold routes pilot oil to and from the loader and backhoe pilot control valves.
Boost Brake Valve
Pilot Manifold
Pump Discharge Load Sense Pilot Pressure
11
Master Cylinder
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.
LS RELIEF LOADER
34 29 14
Slave Cylinder
VALVE
R1
UNIDIRECTIONAL
© 2008 Caterpillar All Rights Reserved
P1
Description
UNIDIRECTIONAL
325-AG135 PK-14
BUCKET
16 15
Wire Color
325-PK Circuit Identification Number
SEVEN BANK VALVE
Wire Color
Wire Gauge
Previous Standard
12
The “E” series machines are equipped with a pilot controlled backhoe valve that is visible with the floor plate at the rear of the cab removed.
14
This illustration shows a seven bank backhoe valve in a 432E Backhoe Loader.
H
C
J
L
K
Wire Color
Wire
D
G E
325-PK-14
B
11 32
33 17
7
1
6
8
10
9
For other bank valve configurations see RENR6487 (Specifications Manual).
16 15
13
32
33 17
1
2
9
B
A
25 26
4 C
T2
BACKHOE VALVE
H
B
C
29
D
Circuit Number Identification
A
Wire Gauge (EXAMPLE VALVE)
E
P
The implement and steering pump on the 432E, 434E, 442E and 444E machines is 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 pressure tap (T2) are accessible from the cab.
12 14 31
11
29 18 34 30
7
22 27 5
21 20 19
6
8
7
10 25 26
R
A D
T2
N
F
T2
The 432E/434E/442E and 444E machines are all equipped with the pilot controlled loader valve as shown in this illustration.
Drain
T1
T1 E
E G These illustrations show the implement and steering pump out of the machine. The following components are visible:
View of mechanically controlled loader valve with floor plate removed.
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)
23 36 28
NOTE: Alpha numeric numbers are represented by the number only on the machine views.
COMPONENT LOCATIONS
IMPLEMENT / STEERING PUMP
1
For other bank valve configurations see RENR6487 (Specifications Manual).
Outlet manifold (A) Auxiliary control valve (B) Tilt control valve (C) Lift control valve (D) Inlet manifold (E) Load sensing relief valve (F) Solenoid for the B circuit (G)
LOADER VALVE
27 28
Solenoid for the A circuit (H) Makeup and relief valve (J) B pilot line port (K) A pilot line port (L) Priority Valve (M) Dead engine lower valve (N) A ports (P) B ports (R)
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.
The loader valve is accessed from below the floor plate. The loader control valve group contains:
C
D
A
THREE BANK VALVE (PILOT OPERATED)
B C
M
B
F
D
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.
C
ECM
RIDE CONTROL 19
20 21
(Dimensions: 39 inches x 28 inches)
29
29
TWO POSITION
THREE POSITION
INFINITE POSITIONING
BACKHOE VALVE (SS) 7 BANK
30 Page,
28
KENR8230-01
28