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UENR4713-01November 2014
924K, 930K and 938K Wheel LoaderHydraulic System Volume 1 of 2: Drive Circuits
Printed in U.S.A.
924K:930K:ENC1-UPDYB1-UPHJF1-UPEYE1-UP ©^ 2014 Caterpillar, All Rights Reserved
938K:XXT1-UPHFW1-UP
ONE POSITION^ TWO POSITION^
THREE POSITION VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL^
RETURN BELOW FLUID LEVEL TWO - WAY^ LINES CROSSING LINES JOINING THREE - WAY^ FOUR - WAY SPRING^ CONTROL VALVES^ RESTRICTION
LINE RESTRICTIONPUMP(FIXED)(2 - SECTION) SPRINGVARIABILITY LINE RESTRICTIONPRESSURE(ADJUSTABLE)(VARIABLE)COMPENSATION
PUMP(VARIABLE & PRESSURECOMPENSATED) MEASUREMENT PRESSURE TEMPERATURE^ FLOW
ROTATING SHAFTS UNIDIRECTIONAL^ BIDIRECTIONAL
PUSH - PULL LEVER^
PEDAL GENERAL MANUAL^ PUSH BUTTON^
SPRING VALVE ENVELOPES^ FIXEDVARIABLE DISPLACEMENTDISPLACEMENTNON-COMPENSATEDUNIDIRECTIONALBIDIRECTIONAL
VALVE PORTS FLUID POWER SYMBOLS FLUID CONDITIONERPUMP OR MOTOR UNIDIRECTIONALBIDIRECTIONAL RELEASED PRESSURE EXTERNAL RETURN^ INTERNAL RETURN
REMOTE SUPPLY PRESSURE SIMPLIFIED SOLENOIDSOLENOIDOR MANUAL& PILOT ACCUMULATORS SPRING LOADED GAS CHARGED HYDRAULIC PUMPS SOLENOID &PILOT OR MANUAL SOLENOID^
CHECK VALVES BASICSPRINGSYMBOLLOADED SERVO THERMAL^ DETENT HYDRAULIC & PNEUMATIC CYLINDERS^ DOUBLE ACTINGSINGLE ACTING
INTERNAL PASSAGEWAYS INFINITE^ 2 POSITIONPOSITIONING3 POSITION FLOW IN ONEFLOW INCROSSPARALLELDIRECTIONEITHERFLOWFLOWDIRECTION
A BA^ B P^ TP^ T NORMAL POSITIONSHIFTED POSITION^ CONTROL VALVES INFINITE POSITION
ATTACHMENT MANUAL SHUTOFF
MAIN^ AUX LINE RESTRICTION(VARIABLE & PRESSURECOMPENSATED) SHUTTLE^ PILOTCONTROLLED BASIC COMPONENT SYMBOLS HYDRAULIC^ PNEUMATIC^ ENERGY TRIANGLES VALVES FLUID STORAGE RESERVOIRSCOMBINATION CONTROLS^ MANUAL CONTROL SYMBOLSPILOT CONTROL SYMBOLSCROSSING & JOINING LINESHYDRAULIC MOTORS
INTERNALCOMPLETESUPPLY PRESSURE FIXEDVARIABLE DISPLACEMENTDISPLACEMENTNON-COMPENSATED ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL) 325-AG135 PK- HARNESS IDENTIFICATION CODE THIS EXAMPLEINDICATES WIRE 135 IN HARNESS “AG” 325-PK-
WIRE NUMBER IDENTIFICATION CODESELECTRICAL SCHEMATIC EXAMPLE^ HYDRAULIC SCHEMATIC EXAMPLECURRENT STANDARD PREVIOUS STANDARD WIRE COLOR WIRE GAUGECIRCUIT NUMBERIDENTIFICATION
CIRCUIT NUMBERWIRE COLORIDENTIFICATION^ 325-PK B
WIRE WIRE
CURRENT STANDARD (EXAMPLE VALVE)
TRANSDUCER(FLUID)
M ELECTRIC MOTOR G TRANSDUCER GENERATOR(GAS / AIR) PRESSURE SWITCH
ELECTRICAL WIRE
PRESSURE SWITCHTEMPERATURE(ADJUSTABLE)SWITCH PRESSURETEMPERATURELEVELSWITCHSWITCHSWITCH
FLOWSWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBERWIREIDENTIFICATIONCOLOR
T WIRE GAUGE
(Dimensions: 39 inches x 28 inches) 30 Page, UENR4713-01 VOL 1 of 2
P (^3021)
P12 12
5
P8^ P7^6
4
13
P17 15 P
19
(^18 202221 )
9
11
16 P11^10 P
26 24 28 298 P14^25 P13 (^27) P
14 23 17 3
TapDescriptionNumber^
Schematic Location^4 - EerusserPegrahC 7 P
(^4) - D lliFegrahC (^8) P
(^3) - Eegau GSOSxobraeG (^9) P
(^3) - DerusserPevirD drawroFtatsyH (^01) P
(^2) - CerusserPevirD esreveRtatsyH (^11) P
(^4) - Begau GSOSciluardyH (^21) P (^3) - Eer usserPxobraeG (^31) P
(^3) - E erusserPebuL (^41) P
(^2) - E erusserPhctulC (^51) P
(^8) - EerusserPeka rBecivreStnorF (^61) P (^8) - EerusserPeka
MachineDescription Part Number Location Tap LocationPressure and SamplingVolume 1 rBecivreSraeR 71 P
SchematicLocation
Accumulator Gp -Brake^
360-9207^1 E-7, E-
Accumulator Gp -Charge^
373-6953^2
E-
Cooler Gp -Hydraulic Oil (Clayton Only)
3 C-
Cooler Gp -Transmission Oil (938K)^
383-7596^4
D-
Filter Gp -Gearbox^
349-3667^5
E-
Filter Gp -Hydraulic Oil^
368-0754^6
E-
Manifold Gp -Brake Accumulator^
349-9089^7 E-7, E-
Manifold Gp -Hystat Interlock Valve^
347-0785^8
E-
Manifold Gp -Hystat Loop (924K, 930K)
Manifold Gp -Hystat Loop (938K)^
Motor Gp -Hystat (115cc)^
307-3077^10
C-
Motor Gp -Hystat (152cc) (924K, 930K)
Motor Gp -Hystat (170cc) (938K)^
Motor Gp -Radiator/Hydraulic Fan^
289-6394^12
C-
Motor Gp - Radiator/Hydraulic Fan (Reversing)
13 C-
Orifice Gp -Motor Flushing Connector^
9X-2614^14 D-
Pedal Gp -Brake^
342-0157^15
E-
eCharge/LubPump Gp -^
307-3079^16
D-
Pump Gp - Fan/Brake (W/Brake Charging Valve)
307-^
17 D-7,D-
Pump Gp -Hystat (924K)^
Pump Gp -Hystat (930K, 938K)^
Sensor Gp -Pressure (Brake Charge)^
344-7391^19
D-
Sensor Gp -Pressure (Hystat Loop FWD)
20 E-6, D-
Sensor Gp -Pressure (Hystat Loop REV)
21 C-
Sensor Gp -Pressure (Park Brake)^
344-7391^22
E-
Transmission Ar -Gearbox (924K, (930K)
Transmission Ar -Gearbox (938K)^
Valve Gp -Check (Hyd Oil Cooler Bypass)
24 C-
Valve Gp -Check (Hystat Flushing)^
370-2280^25
D-
Valve Gp -Check (Pilot Supply)^
123-4750^26
E-
Valve Gp - Check (Xmsn Oil Cooler Bypass)
27 D-
Valve Gp -Park Brake (938K)^
357-0377^28
E-
Valve Gp -Solenoid (Hystat Interlock)^
366-8955^29
E-
Valve Gp - High Altitude / Cold Start^
388-9447^ Not Shown^
C-
Cooler Gp -Hydraulic Oil (Campo Largo Only)
9 D-3, B-2 18 D-6 23 E-2 30 C-
Component Location (Volume 1) Campo Largo Only
11 C-
LEFT SIDE VIEW
RIGHT SIDE VIEW
REAR VIEW RIGHT SIDE VIEW
(Dimensions: 39 inches x 28 inches) 30 Page,UENR4713-01 VOL 1 of 2
THIS SCHEMATIC IS FOR THE 924K, 930K AND 938K WHEEL LOADER HYDRAULIC SYSTEM VOLUME 1 of 2: DRIVE CIRCUITS MEDIA NUMBER: UENR4713-01 SCHEMATIC PART NUMBER: 423-4719, CHANGE: 00, VERSION: - Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.
1 2 3 4 5 6 7 8
F E D C B A 1 2 3 4 5 6 7 8
F E D C B A
LINE PATTERNS Pressure LinePilot / Load Sensing Pressure^ Drain / Return LinesComponent GroupAttachmentAir Line^ CALLOUTS YY^ Taps^ (Pressure, Sampling, Sensor - by letter)Components^ (By number) 52
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS^ PILOT PUMP OUTPUTMAIN PUMP OUTPUTLUBE PUMP CIRCUITAUXILIARY 1 CIRCUITLOAD SENSE CIRCUITSTEERING CIRCUITFAN/BRAKE CHARGE PUMPSUPPLY LINEQUICK COUPLER CIRCUITBRAKE CIRCUITAUXILIARY 2 CIRCUITDRAIN / RETURN LINETILT CYLINDER CIRCUITLIFT CYLINDER CIRCUITHYSTAT CIRCUITLUBE PUMP SUPPLY CIRCUIT
A2A1 (^) SW M P
B R
L
U T1 A
B G
T^
T
F P
T1 E U L
S
Ms
Mp
M
SecondarySteer SteeringImplementLubePump ChargePump
HystatPump
Sec.SteeringFrontSteeringManifoldDual Mode Pilot DrainHMURear DrainManifold ToImpPilot
T
HydraulicTank
ToFrontAxle ToRearAxle U
B
M1 G
A
M
B1^ B2 S2 S1 SOS
Z Y
U TE
G
SA
1:1 Drive Ratio^
(10) MOTOR GPHYSTAT (115cc)307-
(938k): 341-
(9) MANIFOLD GPHYSTAT LOOP
(9) MANIFOLD GPHYSTAT LOOP(938k): 356-
VALVE GP -HIGH ALTITUDE(NOT SHOWN)388-
(21) SENSOR GP - PRESSUREHYSTAT LOOP (REVERSE)349-
(3) COOLER GP - HYDRAULIC OIL421-8495 :(CLAYTON ONLY)
9X-
(25) VALVE GP-CHECKHYSTAT FLUSHING370-
(23) TRANSMISSION AR - GEARBOX358-3002 :(938k)
(6) FILTER GP-OILHYD OIL368-0754(5) FILTER GP-O (BSC)GEARBOX349-3667 (16) PUMP GPCHARGE & LUBE307-
(29) VALVE GP-SOLENOIDHYSTAT INTERLOCK366-
(26) VALVE-CHECKPILOT SUPPLY123-4750(8) MANIFOLD GPHYSTAT INTERLOCK347-
(2) ACCUMULATOR GPCHARGE ACCUMULATOR373-6953 (20) SENSOR GP-PRESSHYSTAT LOOP(FORWARD)349-1178 (18) PUMP GPHYSTAT PUMP(930k, 938k): 307-
(14) ORIFICE GPMOTOR FLUSHING
(11) MOTOR GPHYSTAT (170cc)
GT PC
Fan BrakeValve
B R L To Brakes
(1) ACCUMULATOR GPBRAKE ACCUMULATOR360-
(15) PEDAL GP-BRAKE342-
(28) VALVE GPPARK BRAKE(22) SENSOR GP-PRESS357-0377PARK BRAKE344-7391 (7) MANIFOLD GPBRAKE ACCUMULATOR349-
(19) SENSOR GPPRESSURE(BRAKE CHARGE)344-
(13) MOTOR GP - RADIATOR/HYDRAULIC FAN (REVERSING)289-6393 (12) MOTOR GP - RADIATOR/HYDRAULIC FAN289-
(17) PUMP GP - FAN/BRAKE(W/ BRAKE CHARGING VALVE)^ 307-
(4) COOLER GPXMSN OIL383-
(27) VALVE GP - CHECK(COOLER BYPASS)385-
P
P15 P P13P P7 P
P
P17 P
P
(24) VALVE GP -HYD OIL COOLER BYPASS348-
Fan Motor (Standard)
(924k) 341-
337-7053 :(924k, 930k) (924k, 930k): 307-
423-3531 :(CAMP LARGO ONLY)
345-1707 :(924K, 930K)
(30) COOLER GP - HYDRAULIC OIL
(Dimensions: 39 inches x 28 inches) 30 Page,UENR4713-01 VOL 2 of 2
THIS SCHEMATIC IS FOR THE 924K, 930K AND 938K WHEEL LOADER HYDRAULIC SYSTEM VOLUME 2 of 2: IMPLEMENT CIRCUITS MEDIA NUMBER: UENR4713-01 SCHEMATIC PART NUMBER: 423-4719, CHANGE: 00, VERSION: - Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.
1 2 3 4 5 6 7 8
F E D C B A 1 2 3 4 5 6 7 8
F E D C B A
LINE PATTERNS Pressure LinePilot / Load Sensing Pressure^ Drain / Return LinesComponent GroupAttachmentAir Line^ CALLOUTS YY^ Taps^ (Pressure, Sampling, Sensor - by letter) 52 Components^ (By number)
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS^ PILOT PUMP OUTPUTMAIN PUMP OUTPUTLUBE PUMP CIRCUITAUXILIARY 1 CURCUITLOAD SENSE CIRCUITSTEERING CIRCUITFAN/BRAKE CHARGE PUMPSUPPLY LINEQUICK COUPLER CIRCUITBRAKE CIRCUITDIFFERENTIAL LOCK CIRCUITAUXILIARY 2 CURCUITDRAIN / RETURN LINETILT CYLINDER CIRCUITLIFT CYLINDER CIRCUITHYSTAT CIRCUITLUBE PUMP SUPPLY CIRCUIT
L S^
L4^ L SteeringPumpS X L B^
B
ToChargeCircuitB2B1^ LubePumpFromGear BoxChargePumpS
X1 ImplementPump Implement / Steering Pump - 924K Campo Largo Brazil Only
P5 P3 P6 ToGearBox
P P P
P
P
P^
P
M
L
S
Ride ControlP R H T S LubePumpChargePump L4^ L3 S
HystatPump
M
Tilt Cylinder
Fan MotorReturn
CoolerReturn ToGearBox Fan/BrakeSuction From Gear Box
Park BrakeValve
TP^ LS^ PP
C1^ C
To Pp P CS
Lx RCS
A^ Ls
B^ AB^
B
Tilt^ Lift^
Aux^1
T
C2 C
LS P
LiftCylinders
L
C2C1 TP
LP^ RP
D SB
B^
B
B1^ B2 S
T
FromHystatInterlockValve
ToChargeCircuit
E R
AuxTgBAA
Steering Pump Implement Pump
X
PG
X
PPG GP
Fan MotorCase Drain Brake PedalValve
1:1 Drive Ratio
2
(32) ACCUMULATOR GP - RIDE CONTROL(33) ACCUMULATOR GP - RIDE CONTROL
(36) CYLINDER GPWIDE COUPLER353-
(59) VALVE-CHECK(62) VALVE GPSTEERINGQUICK COUPLER(55) CYL GP352-1108BACKPRESSUREFUSION192-2684COUPLER375-
(64) VALVE-SHUTOFFPETCOCK VALVE6V-
(52) VALVE GP - BANK 2 (IMPLEMENT)(938K): 347-2352(53) VALVE GP - BANK 3 (IMPLEMENT)(54) VALVE GP - BANK 4 (IMPLEMENT)(60) VALVE GPDIFFERENTIAL LOCK (56) VALVE GP - CHECKIMPLEMENTBACK PRESSURE352-1045 (48) SENSOR GP - PRESSUREIMPLEMENT PUMPDISCHARGE344-7391 (41) MANIFOLD GPREAR FRAME RETURN347-
(46) PUMP GP - IMPLEMENT
(50) TANK GPHYDRAULIC TANK349-
(57) VALVE AS - CHECKSTEERING INLET(58) VALVE GP - CHECK175-0447SECONDARYSTEERING9T-1013(42) MANIFOLD GP(49) SENSOR GP - PRESSSTEERINGPRIMARY STEERING346-5095344-7391 (61) VALVE GPDUAL MODESTEERING247-4503 (34) BREATHERHYDRAULIC TANK258-
(51) TUBE ASFRONT FRAMERETURN MANIFOLD349-
(39) CYLINDER GP - STEERING
(63) VALVE GPRIDE CONTROL280-9978(57) VALVE GP - CHECKRIDE CONTROL SUPPLY9T-1013 (43) ORIFICE GPRIDE CONTROL PC366-
(40) CYL GP - TILT (38) CYL GP - LIFT373-
112-1817 (31) ACCUMULATOR GPPILOT
(55) VALVE GP - BALLDEAD ENGINE LOWER
(37) CYL GP - HIGH LIFT TILT
(45) PUMP GP - HAND METERING UNIT(W/DUAL MODE STEERING)
(47) PUMP GPSECONDARY STEERING(W/ INTEGRATED RELIEF)307-
T PDL
CoolerBypass
(39) CYLINDER GPSTEERING347-3852 RPLP PPTP LS(58) VALVE GP - CHECKSECONDARYSTEERING9T-
(44) PUMP GP - HAND METERING UNIT
(65) PUMP GPIMPLEMENT^ 378-
(66) PUMP GPSTEERING378-
(924K): 343-3047(930K): 343-3048(924K): 343-3049(930K): 343-3050(938K): 347-3853(924K): 343-3051(930K): 343-3052(938K): 347-3854 (924K, 930K): 233-7133(938K): 365-
(924K): 373-7017(930K, 938K): 373-6960(924K): 373-7016(930K, 938K): 373-
(930K): 351-8514(938K): 351-8515(924K): 374-9706(930K): 339-5594(938K): 347-3854 (924K): 374-9705(930K): 339-5593(938K): 347-
(924K, 930K): 307-3053(938K): 341-7623 (924K, 930K): 339-5595(938K): 347-3852 (924K, 930K): 307-3081(938K): 341-
(924K): 341-7660(930K): 307-3044(938K): 341-
