7 7 9 9 3 3 C C O O F F F F - - H H I I G G H H W W A A Y Y T T R R U U C C K K © 1997 Caterpillar Inc.
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777799993333CCCC OOOOFFFFFFFF----HHHHIIIIGGGGHHHHWWWWAAAAYYYY TTTTRRRRUUUUCCCCKKKK
© 1997 Caterpillar Inc.
793C MAINTENANCE
793C Service
Procedure
WALK AROUND INSPECTION
SENSORS
ADEM IICONTROL
SERVICELAMP
MESSAGE CENTERMODULE
GAUGE CLUSTERMODULE
KEYPADMODULE
SENSORS
VIMSINTERFACE
MODULE
VIMSINTERFACE
MODULE
SENSORS
VIMSSERVICE TOOL
ANDSOFTWARE
CAT DATA LINK
SERVICEKEYSWITCH
ACTIONLAMP
ACTIONALARM
ELECTRONICTECHNICIAN/ECAP
VIMS MAIN MODULE
DISPLAY DATA LINK
VIMSRS-232PORT
AUTO RETARDERCONTROL
CAT DATA LINK
TRANSMISSIONCONTROL
VITAL INFORMATIONMANAGEMENT SYSTEM
(VIMS)
SPEEDOMETER/TACHOMETER
MODULE
3F12 MPHkm/h
KEYPADDATA LINK
A/C PRESSURESWITCH
CRANKCASEPRESSURE
GROUND LEVELSHUTDOWN SWITCH
FUEL FILTERSWITCH
PRE-LUBRICATIONRELAY
OIL LEVELSWITCH (LOW)
OIL LEVELSWITCH (ADD)
FANFAN SPEED SENSOR
FAN CLUTCHSOLENOID
SERVICE TOOLEPTC II
ARCVIMS
CAT DATA LINK
ENGINE COOLANT TEMPERATURE
ADEM IICONTROLMODULE
GROUNDBOLT
15 AMPBREAKER
MAINPOWER RELAY
KEY STARTSWITCH
SPEED/TIMING SENSOR
ENGINE OIL PRESSURE(UNFILTERED)
COOLANT FLOW SWITCH
TIMING PROBECONNECTOR
ETHER SOLENOID
DISCONNECT SWITCH
3516B ELECTRONIC CONTROLSYSTEM COMPONENT DIAGRAM
ELECTRONIC UNITINJECTORS
TURBO OUTLET PRESSURE (BOOST)
RIGHT TURBO INLET PRESSURE
ATMOSPHERIC PRESSURE
ENGINE OIL PRESSURE (FILTERED)
THROTTLE
ENGINE OILRENEWAL SOLENOID
SHUTTER SOLENOID
REAR AFTERCOOLER TEMPERATURE
LEFT TURBO INLET PRESSURE
RIGHT TURBO EXHAUST
LEFT TURBO EXHAUST
THROTTLE OVERRIDESWITCH
MANUAL ETHERSWITCH
EXHAUSTWASTEGATE
SOLENOID
24 V
3516B IMPROVEMENTSINPUT SWITCHES AND SENSORS
• COOLANT FLOW
• REAR AFTERCOOLER TEMPERATURE
• ENGINE OIL LEVEL
• TURBOCHARGER TEMPERATURE
• ENGINE OIL FILTER PRESSURE/RESTRICTION
• ENGINE FAN SPEED
• FUEL FILTER RESTRICTION
• AIR CONDITIONER COMPRESSOR PRESSURE
• CRANKCASE PRESSURE
3516B IMPROVEMENTSPREVIOUS LOGGED EVENTS
• AIR FILTER RESTRICTION
• LOW OIL PRESSURE
• HIGH COOLANT TEMPERATURE
• ENGINE OVERSPEED
3516B IMPROVEMENTSADDITIONAL LOGGED EVENTS
• OIL FILTER RESTRICTION • HIGH CRANKCASE PRESSURE
• FUEL FILTER RESTRICTION • LOW COOLANT FLOW
• HIGH EXHAUST TEMPERATURE • USER DEFINED SHUTDOWN
• HIGH AFTERCOOLER TEMPERATURE • LOW BOOST PRESSURE
• ENGINE OIL LEVEL LOW • HIGH BOOST PRESSURE
3516B IMPROVEMENTSSYSTEMS CONTROLLED BY ECM
• ETHER INJECTION
• RADIATOR SHUTTER CONTROL
• COLD CYLINDER CUTOUT
• ENGINE START FUNCTION
• ENGINE OIL PRE-LUBRICATION
• VARIABLE SPEED FAN CONTROL
• ENGINE OIL RENEWAL SYSTEM
• EXHAUST BYPASS AT HIGH BOOST
ENGINE OIL COOLER
TORQUE CONVERTER/TRANSMISSION OIL COOLER
ENGINEBLOCK
JACKET WATER COOLANT FLOW
REAR BRAKEOIL COOLERS
THERMOSTATHOUSING
RADIATOR
JACKETWATER PUMP
SHUNTTANK
AFTERCOOLER COOLANT FLOW
FRONT BRAKEOIL COOLER
RADIATOR
AFTERCOOLERWATER PUMP
SHUNTTANK
AFTERCOOLER
ENGINEBLOCK
ENGINE OIL SYSTEM
ENGINEOIL COOLER
ENGINEOIL FILTERS
ENGINEOIL PUMP
SCAVENGEPUMP
BYPASSVALVE
ENGINEOIL RENEWAL
SYSTEM SOLENOID
TO FUELSYSTEM
FUELTANK
PRIMARYFUEL
FILTER
SECONDARYFUEL FILTERS
ENGINEBLOCK
ENGINE OILRENEWAL
SYSTEM SOLENOID
FUELPRESSURE
REGULATOR
FUELTRANSFER
PUMP
FUELHEATER
ADEM IICONTROL
CYLINDERHEAD
FUEL SYSTEM
EXHAUST BYPASS VALVE
MUFFLER
HIGH PRESSURETURBOCHARGER
LOW PRESSURETURBOCHARGER
FROM AIRFILTER
AFTERCOOLER
FROM BRAKEAIR SYSTEM
WASTEGATESOLENOID
VALVE
EXHAUST SYSTEM
PRESSUREREDUCING
VALVE
793C
POWER TRAIN
STATOR
TORQUE CONVERTERCONVERTER DRIVE
LOCKUP PISTON
TORQUE CONVERTERLOCKUP OIL PASSAGE
TURBINE IMPELLER
FREEWHEELASSEMBLY
TORQUE CONVERTERINLET OIL
STATOR
TORQUE CONVERTERDIRECT DRIVE
LOCKUP PISTON
TORQUE CONVERTERLOCKUP OIL PASSAGE
TURBINE IMPELLER
STATOR
FREEWHEELASSEMBLY
TORQUE CONVERTERINLET OIL
1 2 3
45 6
POWER SHIFT PLANETARY TRANSMISSION
OIL COOLER OILFILTER
TEMPERATURE/PRESSURE
CONTROL VALVE
REAR AXLEOIL COOLING AND FILTER SYSTEM
FLOW CONTROL VALVE
DIFFERENTIALOIL PUMP
SUCTIONSCREEN
REAR AXLE
FIRST REDUCTIONRING GEAR
SECOND REDUCTIONRING GEAR SECOND REDUCTION
CARRIER
SECOND REDUCTIONSUN GEAR
SECOND REDUCTIONPLANETARY GEAR
FIRST REDUCTIONPLANETARY GEAR
FIRST REDUCTIONSUN GEAR
FIRST REDUCTIONCARRIER
FINAL DRIVE
LOCKUPSOLENOID
ON
FROMTRANSMISSION
CHARGEPUMP
RELAY VALVE
LOCKUPREDUCING
VALVE
LOCKUPMODULATION
VALVE
LOCKUP CLUTCHPILOT OIL
PRESSURE
TO LOCKUPCLUTCH
FROMTRANSMISSION
CHARGEPUMP
TORQUE CONVERTER LOCKUP CLUTCH CONTROLDIRECT DRIVE
SHUTTLEVALVE
SELECTORPISTON
TOTRANSMISSION
LUBE PUMP
TOSTATION
"D"
DOWNSHIFTSOLENOID
UPSHIFTSOLENOID
LOCKUPSOLENOID
F
G
H
A
B
C
TRANSMISSIONCHARGING
FILTER
ROTARYSELECTOR
SPOOL
NEUTRALIZERVALVEPRIORITY
REDUCTIONVALVE
DOWNSHIFTPRESSURE
UPSHIFTPRESSURE
TRANSMISSION CASETORQUE CONVERTER
HOUSING
CHARGINGPUMP
LUBEPUMP SCAVENGE
PUMP
COOLERBYPASSVALVE
OILCOOLER
LUBRICATIONRELIEF VALVE
PUMPPRESSURE
TO TORQUE CONVERTERRELAY VALVE
SELECTOR VALVE GROUPRELIEF VALVE
TRANSMISSION ICMHYDRAULIC SYSTEM
LOCKUP DUALSTAGE RELIEF VALVE
LUBEPRESSURE
ON
PRESSURE CONTROLGROUP
PILOT OILPRESSURE
D
E
ROTARY ACTUATOR
N1
3
SUCTIONSCREEN
RETURNSCREEN
TC LOCKUPVALVE
TC INLETRELIEFVALVE
TC OUTLETRELIEFVALVE
TC/TRANSPUMPS
TC OUTLETSCREEN
TORQUE CONVERTER/TRANSMISSION COOLER
TC LOCKUPVALVE
TC CHARGINGFILTER
TRANSMISSIONCHARGING
FILTER
TRANSMISSIONMAGNETICSCREENS
RETURNSCREEN
TORQUE CONVERTER ANDTRANSMISSION HYDRAULIC SYSTEM
STARTER SOLENOID
A11
A12A13
A14A15
A16
B10
B9
A17A18
A19
A36
A37
A10 A21 A22 A23 A24 A25
TOS
TRANSMISSION
A26 A3 A4 A5
EPTC II
A - 37 PIN CONNECTORB - 10 PIN SURE-SEAL CONNECTOR
A9
B1
B6
B7
A29
A30
A27
B5
A6
A20
A28
892 - BR
893 - GN
306 - GNE750 - PU
706 - BR
720 - PU
707 - PU
711 - BR
712 - WH
713 - OR714 - YL
715 - GN
716 - BU
307 - OR
D996 - PU
D997 - YL
218- BK
217 - BK
219 - BK
227 - BK
280 - BK
709
- O
R
710
- G
N
72
1 -
BR
722
- W
H
723
- O
R
724
- Y
L
725
- G
N
726
- B
U
703
- B
U
704
- G
Y
705
- P
K
DATA LINK
UP, DOWN,LOCKUPSOLENOIDS
450 - YL
452- PU
2
10
12
3 4 5
11
6 7 8 9
13
D1 D2 D3
BACK-UP ALARMRELAYB2 321- BR
MACHINEID CODE
RAISE SOLENOIDA31 G714 - PU
FLOAT SOLENOIDA32 G711 - BR
LOWER SOLENOIDG712- GNA33
SHIFTLEVERSWITCH
SERVICE "SET" AND"CLEAR" SWITCHES
CONVERTERSPEED
ENGINESPEED
KEY STARTSWITCH
BODY UP
SECONDARYBRAKE
HOISTLEVER
SERVICE/RETARDER
BRAKE
TRANSMISSIONGEAR SWITCH
EPTC II DIAGNOSTIC WINDOW
D1 D2 D3
2
10
12
3 4 5
11
6 7 8 9
13
793C
STEERING
PUMP OUTPUT
LOAD SENSINGPRESSURE
ACTUATOR PISTON
LOAD SENSINGCONTROLLER
SWASHPLATEPISTON
FLOWCOMPENSATOR
DURING CHARGING (CUT-IN)STEERING PUMP
ACCUMULATORCHARGING VALVE
TO ACCUMULATORS
FROM ACCUMULATORSCUT-OUTVALVE
CUT-INVALVE
HIGH PRESSURECUTOFF VALVE
PUMP OUTPUT
LOAD SENSINGPRESSURE
LOAD SENSINGCONTROLLER
FLOWCOMPENSATOR
SWASHPLATEPISTON
ACTUATORPISTON
LOW PRESSURE STANDBY (CUT-OUT)STEERING PUMP
TO ACCUMULATORS
FROM ACCUMULATORS
ACCUMULATORCHARGING
VALVE
CUT-OUTVALVE
CUT-INVALVE
HIGH PRESSURECUTOFF VALVE
FROM PUMP TO PUMP CONTROLSIGNAL PORT
CUT-OUT VALVE
CUT-IN VALVE
FROMACCUMULATOR
TO TANK
FEEDBACK ORIFICE
ACCUMULATOR CHARGE VALVEDURING CHARGING (CUT-IN)
FROM PUMP TO PUMP CONTROLSIGNAL PORT
CUT-OUT VALVE
CUT-IN VALVE
FROMACCUMULATOR
TO TANK
FEEDBACK ORIFICE
ACCUMULATOR CHARGE VALVELOW PRESSURE STANDBY (CUT-OUT)
FROM PUMP TO PUMP CONTROLSIGNAL PORT
CUT-OUT VALVE
CUT-IN VALVE
FROMACCUMULATOR
TO TANK
FEEDBACK ORIFICE
ACCUMULATOR CHARGE VALVELOW PRESSURE STANDBY (CUT-OUT)
FROM PUMP TO PUMP CONTROLSIGNAL PORT
CUT-OUT VALVE
CUT-IN VALVE
FROMACCUMULATOR
TO TANK
FEEDBACK ORIFICE
ACCUMULATOR CHARGE VALVEBEGINNING STAGE OF CUT-IN
BACK-UP RELIEF VALVE
BLEED DOWNSOLENOID
TO TANK
SUPPLY FROM PUMPAND ACCUMULATORS
SOLENOID AND RELIEF VALVE MANIFOLD
RELIEF/MAKEUPVALVE
LEFT TURNCYLINDER BACK PRESSURE
VALVE
LEFT TURN PILOT OIL
AMPLIFIER SPOOL
RIGHT TURN PILOT OIL
COMBINER/CHECKSPOOL
LOAD SENSING PORTFROM
ACCUMULATOR
PRIORITY SPOOL
STEERING DIRECTIONAL VALVE
RIGHT TURNCYLINDER
RELIEF/MAKEUPVALVE
HAND METERINGUNIT SUPPLY ANDTHERMAL BLEED
NO TURN
TO TANK
AMPLIFIER SPOOL
BACK PRESSURE VALVE
LEFT TURN PILOT OILRIGHT TURN PILOT OIL
COMBINER/CHECK SPOOL
LOAD SENSING PORT
FROMACCUMULATOR
HAND METERINGUNIT SUPPLY ANDTHERMAL BLEED
PRIORITY SPOOL
STEERING DIRECTIONAL VALVERIGHT TURN
RELIEF/MAKEUP VALVE
LEFT TURNCYLINDER
RIGHT TURNCYLINDER
RELIEF/MAKEUP VALVE
TO TANK
CONTROLSECTION
SLEEVE
SPOOL
DRIVEPIN
L R PT
THERMAL BLEEDPASSAGES
CENTERINGSPRINGS
METERINGSECTION
ROTOR
STATOR
HAND METERING UNITNEUTRAL POSITION
METERINGSECTION
CONTROLSECTION
SLEEVE
SPOOL
DRIVEPIN
ROTOR
L R PT
STATOR
CENTERINGSPRINGS
HAND METERING UNITRIGHT TURN
793C
HOIST SYSTEM
TO HOISTCYLINDERROD END
TO HOISTCYLINDERHEAD END
TO FRONT BRAKEOIL COOLERS
FRONT BRAKEOIL COOLER
RELIEF VALVE
PARKING BRAKERELEASE PRESSURE
RAISESOLENOID
LOWERSOLENOID
FLOATSOLENOID
PARKING BRAKERELEASE PRESSURE
PUMP SUPPLY PORT
TO TANK
LOW PRESSURERELIEF VALVE
HIGH PRESSURERELIEF VALVE
COUNTERBALANCEVALVE
793CHOIST CONTROL VALVE
HOLD
DUAL STAGERELIEF VALVESIGNAL STEM
ROD END VENT SLOT
LOAD CHECKVALVE
ON
FROM HOISTCYLINDERROD END
TO HOISTCYLINDERHEAD END
TO FRONT BRAKEOIL COOLERS
FRONT BRAKEOIL COOLER
RELIEF VALVE
PARKING BRAKERELEASE PRESSURE
RAISESOLENOID
LOWERSOLENOID
FLOATSOLENOID
PARKING BRAKERELEASE PRESSURE
PUMP SUPPLY PORT
TO TANK
LOW PRESSURERELIEF VALVE
HIGH PRESSURERELIEF VALVE
COUNTERBALANCEVALVE
793CHOIST CONTROL VALVE
RAISE
DUAL STAGERELIEF VALVESIGNAL STEM
ROD END VENT SLOT
LOAD CHECKVALVE
RAISE POSITION
HEAD ENDSIGNAL PRESSURE
FROM HOISTCYLINDERROD END
TO FRONTBRAKE OIL
COOLER
LOWER AND FLOAT POSITIONS
TO HOISTCYLINDERROD END
FROMPUMP
HOISTCOUNTERBALANCE VALVE
ON
ON
TO HOISTCYLINDERROD END
FROM HOISTCYLINDERHEAD END
TO FRONT BRAKEOIL COOLERS
FRONT BRAKEOIL COOLER
RELIEF VALVE
PARKING BRAKERELEASE PRESSURE
RAISESOLENOID
LOWERSOLENOID
FLOATSOLENOID
PARKING BRAKERELEASE PRESSURE
PUMP SUPPLY PORT
TO TANK
LOW PRESSURERELIEF VALVE
HIGH PRESSURERELIEF VALVE
COUNTERBALANCEVALVE
793CHOIST CONTROL VALVE
LOWER (POWER DOWN)
DUAL STAGERELIEF VALVESIGNAL STEM
ROD END VENT SLOT
LOAD CHECKVALVE
ON
TO HOISTCYLINDERROD END
FROM HOISTCYLINDERHEAD END
TO FRONT BRAKEOIL COOLERS
FRONT BRAKEOIL COOLER
RELIEF VALVE
PARKING BRAKERELEASE PRESSURE
RAISESOLENOID
LOWERSOLENOID
FLOATSOLENOID
PARKING BRAKERELEASE PRESSURE
PUMP SUPPLY PORT
TO TANK
LOW PRESSURERELIEF VALVE
HIGH PRESSURERELIEF VALVE
COUNTERBALANCEVALVE
793CHOIST CONTROL VALVE
FLOAT
DUAL STAGERELIEF VALVESIGNAL STEM
ROD END VENT SLOT
LOAD CHECKVALVE
FROM PARKINGBRAKE RELEASE
VALVE
TO HOIST CYLINDERHEAD END
TO HOIST CYLINDERROD END
FROM PARKINGBRAKE RELEASE
VALVE
FRONT BRAKEOIL COOLER
FILTERS
FRONT BRAKEOIL COOLER
DIVERTERVALVE
FRONT BRAKES
HOISTPUMP
HOISTSCREENS
SUCTIONSCREENS
HOISTSYSTEM
HOLDPOSITION
793C
AIR SYSTEM AND BRAKES
AIR COMPRESSORAND GOVERNOR
AIRDRYER
REMOTE AIRSUPPLY CONNECTOR
PRESSUREPROTECTION
VALVE
SERVICE/RETARDERBRAKE RESERVOIR
AIR CHARGING SYSTEM
PARKING/SECONDARYBRAKE RESERVOIR
LOW AIRSWITCH
PARKING BRAKERELEASE VALVE
TOWING SYSTEM
TOWING PUMP
PARKINGBRAKE
RELEASEPUMP
TOWING PUMPRELIEF VALVE
CHECKVALVE
TO HOISTPILOT SYSTEM
RELIEFVALVE
PARKINGBRAKESWITCH
SECONDARYBRAKEVALVE
PARKINGBRAKERELEASEVALVE
PARKING/SECONDARY BRAKES
PARKING BRAKES ENGAGED
TO HOISTPILOT SYSTEM
PARKINGBRAKE
RELEASEPUMP
SECONDARY BRAKES RELEASED
PARKING/SECONDARYBRAKE RESERVOIR
EPTC IISWITCH
AIRPISTON
RODSPRING
INDICATOR ROD
AIRINLET
BRAKE CYLINDERBRAKES ENGAGED
VALVE
OILPISTON
FROMMAKEUP
TANK
TOSLACK
ADJUSTER
OIL FLOWTO BRAKECYLINDER
OIL FLOWFROM BRAKE
CYLINDER
FROMWHEELBRAKES
TOWHEELBRAKES
TOWHEELBRAKES
BRAKES ENGAGEDBRAKES RELEASED
LARGE PISTON
SMALL PISTON
FROMWHEELBRAKES
BRAKE SLACK ADJUSTER
SERVICERELAYVALVE
FRONT BRAKEOIL COOLER
DIVERTERVALVE
SERVICEBRAKEVALVE
RETARDERVALVE
BRAKE CYLINDERS
ARCVALVE
SERVICE/RETARDER BRAKE AIR SYSTEMSERVICE BRAKE ENGAGED
ARCRELAYVALVE
BRAKEENGAGEDSWITCH
REAR BRAKESBRAKE COOLINGPUMPS
SUCTIONSCREENS
REAR BRAKECOOLING CIRCUIT
REAR BRAKEOIL COOLERS
OIL COOLERRELIEF VALVES
PARKING BRAKERELEASE FILTER
HOIST VALVE
PARKING BRAKERELEASE PUMP
PUMPDRIVE
PARKING BRAKERELEASE VALVE
TRACTIONCONTROLSYSTEM
(TCS)VALVE
TO REARBRAKES
TO FRONTBRAKES
AUTOMATICRETARDER
VALVE
SUPPLYSOLENOID
CONTROLSOLENOID
AUTO RETARDERPRESSURE SWITCH
VENT
SUPPLY OUTPUT
CONTROL OUTPUT
AUTO RETARDER PRESSURE INPUT
BRAKE ENGAGED PRESSURE INPUT
BRAKE ENGAGED LAMP OUTPUT
BRAKEENGAGED
LAMP
DATA LINK
HARNESSCODE PLUG
Diagnostic Display
(ARC)CONTROL
RETARDERAUTOMATIC
HARNESSCODE INPUTSENGINE SPEED
SERVICE INPUTS
ARC ON/OFFSWITCH
ON INPUT
OFF INPUT
CLEAR
SET
AIR FROMSERVICE BRAKE
RESERVOIR
BRAKEPEDAL
AND VALVE
RETARDERLEVER
AND VALVE
BRAKE ENGAGEDSWITCH
TO SERVICEBRAKE
RELAY VALVE
VENT
ENGINE SPEEDSENSOR
A11
A26
A17-1936,37
A3
A4
A10
A5
A16
A21
B9B10B6
B7
TO FRONT BRAKEOIL COOLER
DIVERTER VALVETO ARC
RELAY VALVEA - 37 PIN CONNECTORB - 10 PIN SURE-SEAL CONNECTOR
ARC DIAGNOSTIC WINDOW
1 2 3 5 6 74
8
D1 D2 D3
10
12
11
13
SELECTORSOLENOID - LEFT
TRANSMISSIONSPEED
B10
B9
A17
A18
A19
A36
A37
TCS
A - 37 PIN CE CONNECTORB - 10 PIN SURE-SEAL CONNECTOR
A3
A10
MACHINEHARNESS
CODES
892 - BR
893 - GN
774 - YL
213- BK
214 - BK
212 - BK
215 - BK
216 - BK
DATA LINK(NOT USED)
768 - OR
+V TO BRAKE SWITCHAND WHEEL SENSORSA9 767 - WH
BATTERY +BATTERY -
A1132- PK
A2255 - BK
SELECTORSOLENOID - RIGHT
A4 775 - BR
PROPORTIONALSOLENOIDA5 773 - GY
LEFT WHEELSPEED
A29769 - BU
RIGHT WHEELSPEED
A30770 - GN
SERVICE/RETARDERBRAKE SWITCH
B1772 - BR
TESTSWITCH
B2700 - PK
D1 D2 D3
12
2
4
5 6 7
3
8 9 10 11
13
TCS DIAGNOSTIC WINDOW
D1 D2 D3
12
2
4
5 6 7
3
8 9 10 11
13
PARKINGBRAKEVALVE
TRANSMISSIONSPEED SENSOR
SPEEDDISTRIBUTOR
TESTSWITCHBRAKE
SWITCH
SELECTORSOLENOID
PROPORTIONALSOLENOID
SCREEN
ORIFICE
LEFTDRIVE AXLE
RIGHTDRIVE AXLE
TRACTION CONTROL SYSTEM (TCS)ENGINE RUNNING/BRAKES RELEASED
BALL CHECK
OUTPUTSIGNALS
INPUTSIGNALS
PARKINGBRAKEVALVE
TRANSMISSIONSPEED SENSOR
SPEEDDISTRIBUTOR
TESTSWITCHBRAKE
SWITCH
SELECTORSOLENOID
PROPORTIONALSOLENOID
SCREEN
ORIFICE
LEFTDRIVE AXLE
RIGHTDRIVE AXLE
TRACTION CONTROL SYSTEM (TCS)ENGINE RUNNING/LEFT BRAKE ENGAGED
BALL CHECK
OUTPUTSIGNALS
INPUTSIGNALS
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