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DESCRIPTION
hydraulic diagram
Citation preview
RE
NR
6432-0
12
0 P
ag
e,
(Dim
en
sio
ns
: 3
9 i
nc
he
s x
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ch
es
)
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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)
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
FLUID POWER SYMBOLS
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
T
RENR6432-01May 2008
924G and 924GZ Wheel LoaderHydraulic SystemDDA1-UPRTA1-UPRBB1-UPWMB1-UPWGX1-UPDFZ1-UP
©2008 CaterpillarAll Rights Reserved
Printed in U.S.A.
9
9
9 13
1311
1114
3
3 8
8
8
10
10
5
5
23
23
1
12
2
24
24
6
6
7
7
12
12
15
1516
16
17
17 18
18
19
19
21
21
22
22
20
20
4
426
26
924G
COMPONENT LOCATIONS
12
SOS
OIL FILTER
IMPLEMENT PUMP
AA
STEERING PUMP LOAD SENSE
BB
IMPLEMENT PUMP PRESSURE
CC
23
ABOVE IMPLEMENT VALVESFOOT BRAKE
FF
22
DD
EE
GG
HH
14
Tap LocationsPressure and Sampling
TapNumber Description Schematic
LocationAA Implement Pump Load Sense Pressure B-8BB Steering Pump Load Sense Pressure B-8CC Implement Pump Pressure C-6DD Steering Pump Pressure B-7EE Pilot Supply Pressure A-7FF Front Brake Pressure B-9GG Tilt Cylinder Rod End Pressure C-6HH Tilt Cylinder Rod Head Pressure C-6II Rear Axle Cooler Circuit Pressure B-9
SOS Hydraulic Oil Sampling Port (SOS) A-9
Note: Refer to Parts Manuals for your specific machine.
COMPONENT LOCATIONS
Description Part No. 924G
Part No. 924GZ
MachineLocation
SchematicLocation
Accumulator Gp -Brake 140-9251 140-9251 1 B-9,C-9Accumulator Gp -Pilot 243-4398 243-4398 2 A-7Accumulator Gp -Ride Control 223-9698 223-9698 3 D-7Connector -Orifice 8C-0564 8C-0564 4 A-4 to A-6 Connector -Orifice 3E-2335 3E-2335 5 C-6Cooler -Hydraulic Oil Cooler, Standard 239-7394 239-7394 6 A-9Cooler -Hydraulic Oil Cooler, Heavt Dut 239-7395 239-7395 6 A-9Cooler As -Dual Disc Axle Oil 205-3652 205-3652 7 B-9Cylinder Gp -Lift 141-7483 152-4187 8 C-6Cylinder Gp -Steering 142-6251 142-6251 9 E-9Cylinder Gp -Tilt 268-9437 152-5306 10 C-6Cylinder Gp -Coupler, Standard 190-3085 11 E-8Cylinder Gp -Coupler, Wide 188-0982 11 E-8Filter Gp -Element 126-1818 209-3149 209-3149 12 A-9Hand Metering Unit 214-4153 214-4153 13 D-9Manifold 209-0789 209-0789 14 C-8Motor Gp -Axle Oil Cooler 205-5268 205-5268 15 A-9Motor Gp -Radiator Hydr. Fan 205-3669 205-3669 16 A-8Motor Gp -Reversing Fan 205-3778 205-3778 16 A-9Pump Gp -Brake / Fan / Filter 262-2875 262-2875 17 A-8Pump Gp -Spplmnt. Steering 205-5266 205-5266 18 C-9Pump Gp -Steering / Implement 163-2428 163-2428 19 B-8Screen As 247-8298 247-8298 21 B-9Sensor Gp -Brake Pump Pressure 224-4536 224-4536 17 B-8Sensor Gp -Xmssm Neutralizer 290-5825 290-5825 22 C-9Switch As -Axle Cooler Press. 3E-7690 3E-7690 15 B-9Switch As -Float Press. 229-1537 23 A-6Switch As -Ride Contr Disable 126-6916 23 A-6Switch As -Sec. Steering 230-5771 230-5771 14 C-8Tank Gp-Hydraulic Oil 201-8108 201-8108 20 A-8Valve As -Foot Brake 144-8521 144-8521 22 B-9Valve Gp -Ball, Dead Eng. Lwr 112-1817 112-1817 5 C-6Valve Gp -Check 9T-1013 9T-1013 13 D-9, D-8, D-6 Valve Gp -Check, Back Press. 212-7521 212-7521 14 C-8Valve Gp -Combination, Rlf/ Dvtr 173-4032 14 C-6Valve Gp -Coupler Control 233-2549 14 D-8
Valve Gp -Implement 2 Section 209-0273 23 B-4 to B-6, D-1 to D-3
Valve Gp -Implmnt 2 Sec. W/ Regen 209-0270 23
B-4 to B-6,D-1 to D-3
Valve Gp -Implement 3 Section 209-0274 23Valve Gp -Implmnt 3 Sec. W/ Regen 209-0271 23Valve Gp -Implmnt 4 Sec. 209-0275 23Valve Gp -Implmnt 4 Sec. W/ Regen 209-0272 23Valve Gp -Intgrtd 3rd Fnct. Cntrl 262-9706 23 E-2
Valve Gp -Pilot, 2 Single Func. Lvrs 212-1301 212-1301 4 A-4 to A-6, C-1 to C-3
Valve Gp -Pilot, 3 Single Func. Lvrs 212-1304 212-1304 4
A-4 to A-6,C-1 to C-3
Valve Gp -Pilot, 4 Single Func. Lvrs 212-1306 212-1306 4Valve Gp -Pilot, Joystick 212-1302 212-1302 4Valve Gp -Pilot, Joystick / 2 Aux. 212-1307 212-1307 4Valve Gp -Pilot, Joystick / Aux. 212-1305 212-1305 4Valve Gp -Pressure Reducing 185-5209 185-5209 24 B-7Valve Gp -Relief 251-0907 251-0907 25 C-9Valve Gp -Ride Control 141-1481 141-1481 3 D-7Valve Gp -Shutoff, Hydr. Drain 6V-7238 6V-7238 24 B-7Valve Gp -Pilot Shut-Off 233-7133 233-7133 26 A-7Valve Gp -Sol, Ride Control 297-1209 297-1209 26 D-7
RE
NR
6432-0
12
0 P
ag
e,
Co
lor
2,
(Dim
en
sio
ns
: 3
9 i
nc
he
s x
24
in
ch
es
)
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 924G AND 924GZPART NUMBER: 203-3878, CHANGE: 04, VERSION: (-)PART NUMBER: 203-3879, CHANGE: 03, 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
LINES GROUP COLOR DESCRIPTIONSSTEERING / PILOT PUMP CIRCUIT
IMPLEMENT PUMP CIRCUIT
STEERING CIRCUIT
PILOT
AXLE OIL
SUPPLY LINE
COUPLER CYLINDER
LOAD SENSING
THIRD FUNCTION
SECONDARY STEERING PUMP
LIFT CYLINDERS
FOURTH FUNCTION
TILT CYLINDERS
AXLE COOLING / BRAKE / FAN PUMP CIRCUITAXLE COOLING / FAN CIRCUIT
A
B
C
D
E
123456789
A
B
C
D
E
123456789
S3S2
P T
N1
T LS P
S3S2
S1
DUMP LOWER /FLOAT
RACKBACK
WIRED TO CONTROLLER
RAISE
M
FROM CONTROLLER
P
LS
T
TO FOURTH FUNCTION
TO REAR BRAKES
TO FRONT BRAKES
TO THIRD FUNCTION
AXLE OIL
S4
O
P
T
A1 A2
EF
BACK FORWARD
DUMP LOWER /FLOAT
RACKBACK
WIRED TO CONTROLLER
RAISE
P
LS
T
TO FOURTH FUNCTIONTO THIRD FUNCTIONPT3
P T
C1 C2
PILOT SUPPLY(FROM SHUT-OFF VALVE)
INTEGRATED THIRD FUNCTION
TANK GPHYDRAULIC201-8108
VALVE GP2 SECTIONWITH REGENERATION 924G: 209-0270
VALVE GP3 SECTIONWITH REGENERATION 924G: 209-0271
VALVE GP4 SECTIONWITH REGENERATION 924G: 209-0272
VALVE GPCHECKBACK PRESSURE212-7521
VALVE ASFOOT BRAKE144-8521
VALVE GPPRESS. REDUCING185-5209
VALVE GPRELIEF251-0907
VALVE GPPILOT,JOYSTICK212-1302
VALVE GPPILOTJOYSTICK / AUX212-1305
VALVE GPPILOTJOYSTICK / 2 AUX924G: 212-1307
VALVE GPRIDE CONTROL141-1481
CYLINDER GPLIFT924G: 141-7483924GZ: 152-4187
MANIFOLD209-0789
ACCUMULATOR GPPILOT243-4398
MOTOR GPAXLE OIL COOLER205-5268
COOLERHYDR. OILSTANDARD : 239-7394HEAVY DUTY : 239-7395
HAND METERING UNIT214-4153
PUMP GPSUPPLEMENTALSTEERING205-5266
CYLINDER GPSTEERING142-6251
ACCLMTR.GPBRAKE140-9251
PUMP GPBRAKE AND FAN262-2875
MOTOR GPOPTIONALREVERSING FAN289-6394
FILTER GP209-3149
CONNECTORORIFICE8C-0564
CONNECTORORIFICE8C-0564
CONNECTORORIFICE8C-0564
VALVE GPBALLDEAD ENG. LOWER112-1817
COOLER ASDUAL DISC BRAKES205-3652
SWITCH ASRIDE CNTRL DSBL924G: 126-6916
SWITCH ASFLOAT PRESS.924GZ: 229-1537
SWITCH ASSEC. STEERING.230-5771SENSOR GP
TRANSMISSIONNEUTRALIZER290-5825
SENSOR GPBRAKE PUMPPRESSURE224-4536
SWITCH ASAXLE CLR PRESS.3E-7690
SCREEN AS247-8298
CONNECTORORIFICE3E-2335
VALVE GPSHUTOFFHYDR. DRAIN6V-7238
ACCUMULATOR GPRIDE CONTROL223-9698
CYLINDER GPCOUPLERSTANDARD924G: 190-3085WIDE924G: 188-0982
VALVE GPCOUPLER CONTROL233-2549
VALVE GPCOMBINATIONRELIEF / DVRTR924G: 173-4032
VALVE GPINTEGRATED 3RD FUNCTION CONTROL924G: 262-9706
VALVE GPSOLENOIDPILOT SHUTOFF233-7133
MOTOR GPRAD. HYDR. FAN289-6393
VALVE GPPILOT2 SINGLE FUNCTION LEVERS924GZ: 212-1301
VALVE GPPILOT3 SINGLE FUNCTION LEVERS924GZ: 212-1304
VALVE GP2 SECTION924GZ: 209-0273
VALVE GP3 SECTION924GZ: 209-0274
VALVE GPPILOT3 SINGLE FUNCTION LEVERS924GZ: 212-1306
VALVE GP4 SECTION924GZ: 209-0275
VALVE GPCHECK9T-1013
VALVE GPCHECK9T-1013
CYLINDER GPTILT924G: 268-9437924GZ: 152-5306
VALVE GPSOLENOIDRIDE CONTROL297-1209
PUMP GPIMPLEMENT /STEERING 163-2428
AABB
CC
DD
EE
FF
GG
HH
II
SOS
INDICATES COMPONENTSUSED ON 924G ONLY
INDICATES COMPONENTSUSED ON 924GZ ONLY
NOTE A: USED ON 924GZ
NOTE A
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