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CAT 924K and 930K Wheel Loader Hydraulic System

INTERACTIVE SCHEMATIC
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Cover Page
Information
Schematic
Machine Views
Component Table
Tap Table
Fluid Power Symbols
Electrical Symbols
Front Frame
Rear Frame
Tap Views
Features
Options
Bookmarks
X
EC-C3
EC-C2
E-C60
EC-C1
E-C61
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UENR0288
February 2012
Volume 1 of 2: Drive Circuits
924K and 930K Wheel Loader
Hydraulic System
924K:
PWR1-UP
930K:
RHN1-UP
Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved
Volume 2 of 2: Implement Circuits
COMPONENTS AND TAPS (Volume 1)
Tap
Number
Description
Schematic
Location
4-EerusserP egrahC7P
4-DlliF egrahC8P
3-EGauge SOS xobraeG9P
3-D erusserP evirD drawroF tatsyH01P
2-C erusserP evirD esreveR tatsyH11P
4-BGauge SOS ciluardyH21P
3-EerusserP xobraeG31P
3-EerusserP ebuL 41P
2-EerusserP hctulC51P
8-E erusserP ekarB ecivreS tnorF61P
8-EerusserP ekarB ecivreS raeR71P
Tap Location
Pressure and Sampling
Volume 1
Description
Part
Number
Machine
Location
Schematic
Location
8
,7-E17029-063ekarB - pG rotalumuccA
6
-
E23596-373egrahC - pG rotalumuccA
4
-
C
77530-253liO ciluardyH - pG relooC
3
-E417663-943xobraeG - pG retliF
4
-
E
51
4570-863xobraeG - pG retliF
8
,
7
-E61
9809-943rotalumuccA ekarB - pG dlofinaM
5
-E71
5870-743evlaV kcolretnI tatsyH - pG dlofinaM
3
-D817071-543pooL tatsyH - pG dlofinaM
3
-C127703-703)cc511( tatsyH - pG rotoM
1
-
C222803-703)cc251( tatsyH - pG rotoM
8
-C
3
23936-982naF ciluardyH/rotaidaR - pG rotoM
Motor Gp - Radiator/Hydraulic Fan (Reversing) 289-6394 24 C-8
2-D52
4162-X9rotcennoC gnihsulF rotoM - pG ecifirO
8
-E
72
7510-243ekarB - pG ladeP
4
-D829703-703ebuL - pG pmuP
Pump Gp - Fan/Brake (W/Brake Charging Valve) 341-7633 29 D-7,8
6-
D
23
8367-143)K429( tatsyH - pG pmuP
6
-D235603-703)K039( tatsyH - pG pmuP
8
-E5
31937-443)egrahC ekarB( erusserP - pG rosneS
6
-
D,E638711-943)DWF pooL tatsyH( erusserP - pG rosneS
6
,5-C73
8711-943)VER pooL tatsyH( erusserP - pG rosneS
7
-E
391937-443)ekarB kraP( erusserP - pG rosneS
2
-
E24
3507-733xobraeG - rA noissimsnarT
6
-C84
8702-843)ssapyB relooC liO dyH( kcehC - pG evlaV
1
-
D
9
40822-073)gnihsulF tatsyH( kcehC - pG evlaV
5
-E15
123-4750Check (Pilot Supply) - pG evlaV
Component Location Volume 1
7-
E
85
7730-753ekarB kraP - pG evlaV
COMPONENTS AND TAPS (Volume 2)
Tap
Number
Description
Schematic
Location
3-CerusserP egrahcsiD gnireetS1P
5-CerusserP esnesdaoL gnireetS2P
5-EerusserP Discharge tnemelpmI3P
6-C erusserP esnesdaoL tnemelpmI4P
5-E erusserP toliP tnemelpmI5P
5-DerusserP relpuoC kciuQ6P
Tap Location
Pressure and Sampling
Volume 2
Description
Part
Number
Machine
Location
Schematic
Location
4-E34107-373toliP - pG rotalumuccA
2
-F47107-373)K429( lortnoC ediR - pG rotalumuccA
2
-E40696-373)K039( lortnoC ediR - pG rotalumuccA
2
-F56107-373)K429( lortnoC ediR - pG rotalumuccA
2
-E52696-373)K039( lortnoC ediR - pG rotalumuccA
4
-B69282-852knaT ciluardyH - rehtaerB
6
-D84270-573relpuoC noisuF - pG rednilyC
5
-D95739-353relpuoC ediW - pG rednilyC
3
-F013158-153)K429( tliT tfiL hgiH - pG rednilyC
3
-E014158-153)K039( tliT tfiL hgiH - pG rednilyC
3
-F110955-933)K429( tfiL - pG rednilyC
3
-E113955-933)K039( tfiL - pG rednilyC
2
-D215955-933gnireetS - pG rednilyC
3
-F312955-933)K429( tliT - pG rednilyC
3
-F314955-933)K039( tliT - pG rednilyC
7
-D916908-743nruteR emarF raeR - pG dlofinaM
3
-C025905-643gnireetS - pG dlofinaM
2
-E623798-663CP lortnoC ediR - pG ecifirO
2
-C033503-703gnireteM dnaH - pG pmuP
Pump Gp - Hand Metering (W/Dual Mode Steering) 307-3081 31 C-2
7-B330667-143)K429( pmuP tnemelpmI - pG pmuP
7
-B334403-703)K039( pmuP tnemelpmI - pG pmuP
Pump Gp - Secondary Steering (W/Integrated Relief) 307-3051 34 C-1
Sensor Gp - Pressure (Implement Pump Discharge) 344-7391 38 E-7
3-C041937-443)gnireetS yramirP( erusserP - pG rosneS
5
,4-A149918-943ciluardyH - pG knaT
3
-D343487-943nruteR emarF tnorF - sA ebuT
6
-E447403-343)K429( )tnemelpmI( 2 knaB - pG evlaV
6
-E448403-343)K039( )tnemelpmI( 2 knaB - pG evlaV
6
-E549403-343)K429( )tnemelpmI( 3 knaB - pG evlaV
6
-E540503-343)K039( )tnemelpmI( 3 knaB - pG evlaV
6
-E641503-343)K429( )tnemelpmI( 4 knaB - pG evlaV
6
-E642503-343)K039( )tnemelpmI( 4 knaB - pG evlaV
4
-F747181-211)rewoL enignE daeD( llaB - pG evlaV
Valve Gp - Check (Implement Backpressure) 352-1045 50 E-7
2-E253101-T9)ylppuS lortnoC ediR( kcehC - pG evlaV
3
-C353101-T9)gnireetS yradnoceS( kcehC - pG evlaV
7
-D454862-291)erusserpkcaB gnireetS( kcehC - pG evlaV
3
-C557440-571)telnI gnireetS( kcehC - pG evlaV
8
-E653317-332kcoL laitnereffiD - pG evlaV
3
-B753054-742edoM lauD - pG evlaV
6
-D958011-253relpuoC kciuQ - pG evlaV
2
-E068799-082lortnoC ediR - pG evlaV
7
-D168327-V6)kcocteP( ffotuhS - pG evlaV
5
-E,D265598-663)kcolretnI tatsyH( dioneloS - pG evlaV
Component Location Volume 2
FLUID POWER SYMBOLS
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
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 ACTINGSINGLE 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
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
ELECTRICAL SYMBOLS
Hydraulic Symbols (Electrical)
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
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
T
Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
VOLUME 1 of 2: DRIVE CIRCUITS
SCHEMATIC PART NUMBER: 339-6678, CHANGE: 00, VERSION: -
SCHEMATIC PART NUMBER: 339-6677, CHANGE: 00, VERSION: -
THIS SCHEMATIC IS FOR THE 924K and 930K WHEEL LOADER HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
LUBE PUMP SUPPLY CIRCUIT
MAIN PUMP OUTPUT
LUBE PUMP CIRCUIT
AUXILIARY 1 CIRCUIT
LOAD SENSE CIRCUIT
STEERING CIRCUIT
FAN/BRAKE CHARGE PUMP
SUPPLY LINE
QUICK COUPLER CIRCUIT
BRAKE CIRCUIT
AUXILIARY 2 CIRCUIT
DRAIN / RETURN LINE
TILT CYLINDER CIRCUIT
LIFT CYLINDER CIRCUIT
HYSTAT CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
P12
P11
P15
P14
P13
P9
P10
P8
P7
P16
P17
To Brakes
M
A
T1
U
G
B
T1
T2
F
PU L
T1
E
S
Ms
Mp
M
Secondary
Steer
Steering
Implement
Charge
Pump
Lube
Pump
Hystat
Pump
Sec.
Steering
Rear Drain
Manifold
Front
Manifold
HMU
Pilot Drain
Dual Mode
Steering
To
Imp
Pilot
T2
Hydraulic
Tank
To
Rear
Axle
To
Front
Axle
U
B
M1
G
A
M1
B1 B2
S2
S1
B
R
L
SW
T
P
C
GP
P
EF
SOS
Y
Z
A1
A2
U
T
E
G
SA
1:1 Drive Ratio
307-3077
(21) MOTOR GP
307-3082
HYSTAT (152cc)
345-1707
(18) MANIFOLD GP
HYSTAT LOOP
345-1707
(18) MANIFOLD GP
HYSTAT LOOP
348-2078
(48) VALVE GP - CHECK
HYD OIL COOLER BYPASS
349-1178
(37) SENSOR GP - PRESSURE
HYSTAT LOOP (REVERSE)
352-0357
(7) COOLER GP
HYDRAULIC OIL
9X-2614
MOTOR FLUSHING
370-2280
(49) VALVE GP-CHECK
HYSTAT FLUSHING
337-7053
(42) TRANSMISSION AR
GEARBOX
307-3079
(28) PUMP GP
CHARGE & LUBE
368-0754
(15) FILTER GP-OIL
HYD OIL
349-3667
(14) FILTER GP-O (BSC)
GEARBOX
366-8955
(62) VALVE GP-SOLENOID
HYSTAT INTERLOCK
123-4750
(51) VALVE-CHECK
PILOT SUPPLY
347-0785
(17) MANIFOLD GP
HYSTAT INTERLOCK
341-7638 - (924K)
(32) PUMP GP
- HYSTAT PUMP
349-1178
(36) SENSOR GP-PRESS
HYSTAT LOOP (FORWARD)
373-6953
(2) ACCUMULATOR GP
CHARGE ACCUMULATOR
341-7633
(29) PUMP GP - FAN/BRAKE
(W/ BRAKE CHARGING VALVE)
344-7391
(39) SENSOR GP-PRESS
PARK BRAKE
357-0377
(58) VALVE GP
PARK BRAKE
360-9207
(1) ACCUMULATOR GP
BRAKE ACCUMULATOR
342-0157
(27) PEDAL GP-BRAKE
349-9089
(16) MANIFOLD GP
BRAKE ACCUMULATOR
344-7391
(35) SENSOR GP - PRESSURE
BRAKE CHARGE
289-6393
(23) MOTOR GP
RADIATOR/HYDRAULIC FAN
289-6394
(24) MOTOR GP
RADIATOR/HYDRAULIC FAN (REVERSING)
HYSTAT (115cc)
(25) ORIFICE GP
(22) MOTOR GP
307-3065 - (930K)
Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
VOLUME 2 of 2: IMPLEMENT CIRCUITS
SCHEMATIC PART NUMBER: 339-6678, CHANGE: 00, VERSION: -
SCHEMATIC PART NUMBER: 339-6677, CHANGE: 00, VERSION: -
THIS SCHEMATIC IS FOR THE 924K and 930K WHEEL LOADER HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
LUBE PUMP SUPPLY CIRCUIT
MAIN PUMP OUTPUT
LUBE PUMP CIRCUIT
AUXILIARY 1 CURCUIT
LOAD SENSE CIRCUIT
STEERING CIRCUIT
FAN/BRAKE CHARGE PUMP
SUPPLY LINE
QUICK COUPLER CIRCUIT
BRAKE CIRCUIT
DIFFERENTIAL LOCK CIRCUIT
AUXILIARY 2 CURCUIT
DRAIN / RETURN LINE
TILT CYLINDER CIRCUIT
LIFT CYLINDER CIRCUIT
HYSTAT CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
P6
P3
P5
P1
P2
P4
M
L1
S1
L4
L3
S2
Lube
Pump
Charge
Pump
P
H
R
T S
Hystat
Pump
M
Tilt Cylinder
Fan Motor
Return
Cooler
Return
Cooler
Bypass
Fan/Brake
Suction
To
Gear
Box
From Gear Box
Park Brake
Valve
TP
LS PP
C1 C2
To
Pp
P
CS
RCS
Lx
Ls
A
A
B
B
B
Tilt Lift
Aux
1
T
C1
C2LS
P
Lift
Cylinders
L2
T
C2C1
P
LP RP
D
SB
B1 B2
B1 B2
S2
T
P
T
C
From
Hystat
Interlock
Valve
To
Charge
Circuit
R
E
A
B
A
Aux
Tg
Steering Pump
Implement Pump
X2
PG
X1
PPG
GP
Fan Motor
Case Drain
Brake Pedal
Valve
1:1 Drive Ratio
2
373-7017 - (924K)
373-6960 - (930K)
(4) ACCUMULATOR GP
373-7016 - (924K)
373-6962 - (930K)
(5) ACCUMULATOR GP
RIDE CONTROL
353-9375
(9) CYLINDER GP
WIDE COUPLER
375-0724
(8) CYL GP
FUSION
COUPLER
352-1108
(59) VALVE GP
QUICK
COUPLER
192-2684
(54) VALVE-CHECK
STEERING
BACKPRESSURE
6V-7238
(61) VALVE-SHUTOFF
PETCOCK VALVE
347-8096
(19) MANIFOLD GP
REAR FRAME RETURN
352-1045
(50) VALVE GP - CHECK
IMPLEMENT
BACK PRESSURE
344-7391
(38) SENSOR GP - PRESSURE
IMPLEMENT PUMP
DISCHARGE
233-7133
(56) VALVE GP
DIFFERENTIAL LOCK
343-3047 - (924K)
(44) VALVE GP - BANK 2
IMPLEMENT
343-3049 - (924K)
(45) VALVE GP - BANK 3
IMPLEMENT
343-3051 - (924K)
343-3048 - (930K)
343-3050 - (930K)
343-3052 - (930K)
(46) VALVE GP - BANK 4
IMPLEMENT
341-7660 - (924K)
307-3044 - (930K)
(33) PUMP GP - IMPLEMENT
349-8199
(41) TANK GP
HYDRAULIC TANK
258-2829
(6) BREATHER
HYDRAULIC TANK
247-4503
(57) VALVE GP
DUAL MODE
STEERING
344-7391
(40) SENSOR GP - PRESS
PRIMARY STEERING
175-0447
(55) VALVE AS - CHECK
STEERING INLET
9T-1013
(53) VALVE GP - CHECK
SECONDARY
STEERING
346-5095
(20) MANIFOLD GP
STEERING
349-7843
(43) TUBE AS
FRONT FRAME
RETURN MANIFOLD
339-5595
(12) CYLINDER GP
STEERING
366-8973
(26) ORIFICE GP
RIDE CONTROL PC
280-9978
(60) VALVE GP
RIDE CONTROL
RIDE CONTROL
9T-1013
(52) VALVE GP - CHECK
RIDE CONTROL SUPPLY
339-5590 - (924K)
(11) CYL GP - LIFT
339-5592 - (924K)
339-5594 - (930K)
(13) CYL GP - TILT
373-7014
(3) ACCUMULATOR GP
PILOT
112-1817
(47) VALVE GP - BALL
DEAD ENGINE LOWER
351-8513 - (924K)
351-8514 - (930K)
(10) CYL GP - HIGH LIFT TILT
307-3053
(30) PUMP GP
HAND METERING UNIT
307-3081
(31) PUMP GP
HAND METERING UNIT
(W/DUAL MODE STEERING)
307-3051
(34) PUMP GP
SECONDARY STEERING
(W/ INTEGRATED RELIEF)
339-5593 - (930K)
RIDE CONTROL ACCUMULATORS VIEW
26
5
4
3
MANIFOLD AND PUMP VIEW
34
33
31
30
20
19
TANK GROUP VIEW
41 6
CYLINDER GROUP VIEW
13
12
11
10
9
8
RIGHT SIDE VIEW (Accumulators)
2 1
REAR VIEW (Hydraulic Cooler)
7
LEFT SIDE VIEW (Pumps)
32
29
28
RIGHT SIDE VIEW (Drive Motors)
P12
24
23
22
21
HYSTAT MOTOR VIEW (Flushing Orifice)
HYSTAT
MOTOR
(115CC)
HYSTAT
MOTOR
(152CC)
HYSTAT
MOTOR
(115CC)
HYSTAT
MOTOR
(152CC)
25
25
CAB VIEW (Brake Pedal Group)
P17
P16
27

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