Description Power Distribution Circuits B AT HD LMP K EY S W M AI NP OW ER R EL AY O UT PU T O PR M ON P A NE L B +S W T I C HE D A UX C KT A UX C KT A U XC K T BACKUP ALARM TO LAMP A U XC K T A/C A/ A U XC K T A UX C KT A U XC K T A UX C KT A U XC K T GroundCircuits MAIN CHASSIS BasicMachineCircuits STARTER RELAY NO.OUTPUT STARTERRELAYCOILTONEUT STARTSWORKEY SW
K E YS W T O N E UT S T AR T S W M AI N PO WE RR RR EL AY CO CO LI ALTERNATOR REGULATOR TERM. S T AR T A I DS W T OS T AR TA I DS OL S T AR T A I DS O LT OT E MP S W B CKP AL ALARM LA M P TR TRAV EL ALA RM WARNINGHORN(FORWARD) MonitoringCircuits O PR MO NO LI P RE SS . L( OS OS ET TI NG ) O P RM ON C OO L AN T T E MP OPR MON PARKING BRAKE E N GC OO LA N TT E MP G AG E POWER TRAINTEMPGAGE F UE LLE VE LG LGAGE T AC HS EN DE R( +)
Accessory Circuits BR WP I ER - F RO NT ( PA RK ) GN WIPER - FRONT (LO) WI OR WP I ER - F RO NT ( HI ) BR WP I ER - R EA R (P AR K) YL W I PE R- R E AR ( L O) B U WP I ER - RE AR (H (H )I P U W AS HE R- F RO NT O R A / C CO MP RE S SO R/ R EF R G I ER A NT P R ES S . SW GY B LOWER MOTOR (HI) G N B L OW ER M O TO R ( M E DU I M) BU BLOWER MOTOR (LO) W H O P RA / CS WT O T H ER MO S TA T F / U SE YL AC / S WT OR EF RI GE RA NT S W W H A / CC L UT C HT O T H ER MO ST A TS W W H H AZ AR DS WT OT UR NS W G N T U RN S I GN A LS W T OF L AS H ER B R H AZ AR D N I DI CA TO R WH F OUR WHEEL DRIVE SOL GY REARWIPER INTERRUPTSW TOWIPER SW GN WARNING N G BUZZER TO DIODES PK WP I ER -A UX L ( O) PU W I PE R - A UX ( H )I G N R EA RI NT ER RU PT S WT OW P I ER M OT OR LightingCircuits PK R OT A RY B E AC ON O R S T OP L A MP YL T URN LA MP - LEF T GY TURNLAMP-RIGHT PK F LO OD LA MP - FR ON T G N F LO OD LA LA MP - RE AR O R H E AD L A M P B A SI C PU HEAD LAMP HI PU P A RK / TA I L/ DA S H LA MP BR TAIL/POSITION LAMP- LEFT(ROAD PKG)/WIDTH YL T AIL/ POSI TION LA MP - RIGH T(R OAD P KG) W / I DT H G N H EA D LA MP L O WH HEADLAMP SW TO WORK/HEAD LAMP JUMPER ControlCircuits YL B U CK E T PO STI I ON E R SO L S W G N X M S N DI S CO NN E CT S O L
Off Machine Switch Specifications Pa rt No.
Functi on
8N1693
CoolantTemperature(StartAid)
6T2665
CoolantTemperature
Ac tuate
Deactua te
37.8±2.8°C (100±5°F) 107.2±2.8°C (225±5°F)
26.7°CMIN (80°FMIN) 93°CMIN (196°FMIN)
Conta ct Position Normally Closed Normally Closed
Resistor and Solenoid Specifications Compone nt
Part No .
Re sistance (Ohms )¹
Resistor - Alternator
8C4110
22 ± 1.1
Resistor -Blower M otor Speed
7T3828
Overall 1.0 ±.1; Tap 0.5 ±.05
Solenoid - A/C Clutch
8T8812
Solenoid - Bucket Positioner
9T7304
3.5 ± 0.15 18
Solenoid - Start Aid
3T9493
1.5
¹ Atroomtemperature. e.
416, 426, 428, 436 And 438 Series II Backhoe Loaders Electrical System
Harness And Wire Electrical Schematic Symbols Component Location Chart Machine Location 1 A
Component Alarm - Backup
Schematic Location B-9
Machine Location 12
Component Solenoid -E -Engine Shutdown
Schematic Location D-2
Alarm-Fault
C-3
13
Solenoid-FrontDrive
C-2
2
Alternator
C-1
14
Solenoid - Start Aid
F-2
3
Batteries
C
Breaker - Running Lamp
A C B B B
Flasher
F-5
15
Solenoid - Transmission Neutralizer
C-2
C-8
16
Switch - Backup Alarm
C-2
C-9
B
Switch-Beacon
C-8, C-3
A
Switch -B -Blower (Heater And Air Cond)
Gauge -C -Converter Temperature
D-8
17
Switch -B -Bucket Positioner
A-1
Gauge -C -Coolant Temperature
D-8
18
Switch -C -Coolant Temperature
C-2
Fuse -H -Holders
Gauge - Fuel
D-9
19
Switch - Coolant Temp (Start Aid)
C-1
Gauge - Tachometer
D-9
20
Switch - Engine Oil Pressure
D-1
Horn - Forward
D-1
A
Switch - Forward Horn Sw
C-4
B
Meter - Service
D-9
B
Switch - Front Drive
C-6
Meter - Volt
D-8
B
Switch - Front Wiper
C-6
A
Motor-Blower
D-3
B
Switch-Hazard
D-7
A
Motor-Fan
A
Motor-FrontWiper
A
Motor-RearWiper(Lower)
F-8
21
Switch-Neutral/Start
C-2
A
Motor-RearWiper(Upper)
E-9
22
Switch -ParkingBrake
F-6
5
Motor - Starter
E-2
B
Switch - Rear Dual Wiper
D-6
C
Relay
E-7
B A
Switch-KeyStart Switch-LampTest
C-8
B
Switch - Rear Flood Lamp
D-7
Relay - Main
C-7
23
Switch - Refrigerant
F-1
Relay - Start
C-7
B
Switch - Running Lamp
D-6
6
Resistor - Alternator Field
D-7
B
Switch - Start Aid
D-7
Resistor-BlowerMotorSpeed
D-3
A
Switch-Thermostat
C-3
Sender - Converter
C-2
A
Switch - Turn Signal
8
Sender -C -Coolant Temperature
C-1
24
Switches -B -Brake S ( top Light)
Sender -F -Fuel
A-6
A
Switches -T -Transmission Neutralizer
10
Solenoid -A -Air Conditioner Clutch
D-1
A
Switches -W Sw -Wiper Disconnect
11
9
Solenoid - Bucket Positioner
A-4
2
Typical representationof a Sure-Seal connector. The plugand receptacle contain bothpins andsockets.
T
3
22
Pressure Symbol
9 3 6
8 16
7 1
2
B
5 12 20
14
Level Symbol
PinorSocket Number
Flow Symbol
Wire, Cable, orHarness Assembly Identification
8
7
19
23
C
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
11
C
Component PartNumber
Single Wire Connector
2 18 17
6
Temperature Symbol
4
10
15 21
5
1
13
24 A
D-8
C
7
1 2
Typical representationof a Deutschconnector. The plug contains all sockets andthe receptacle contains allpins.
Receptacle
Plug
C-4
C
A
1 2
1
Electrical Schematic Symbols And Definitions
D-7
4
D-3
AA
E-3
B
B
A
A
A 325-PK-14
9
Pin
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
AA 1
9X-1123 325-PK-14
Wire Color
Socket
2
200-BK-14
Normally closed switch that will open with an increase of a specific condition. CircuitNumber Identification
E-4
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
A
D-4 D-6, D-4
9
E-8
B 1
A= Componentsinoperatorcompartment.
2
C
C= Componentsonrelaypanel(insiderightconsole). 1
4 10
22
6
8
5
7
24 16
Electrical Schematic Symbols And Definitions
17
3 6
B= Componentsinoperatorcompartment-Rightconsole.
14
15 21
11
7
5
18
12
19
20
FUSE - A componentin an electrical circuitthat will open the circuitif too much current flows through it.
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
8 2
REED SWITCH -A switch whose contacts arecontrolledby a magnet. A magnet closesthe contacts of anormally open reed switch; itopens thecontacts of a normally closed reed switch.
23
9 3
Wire Gauge
13
No circle indicates that the wire cannot be disconnected from the component.
T
Machine Harness Connector and Component Locations
SENDER- Acomponent thatis usedwithatemperature orpressure gauge. The sender SENDER measures the temperatureorpressure. Its resistancechanges ancechanges to give an indicationto the gauge ofthe temperature orpressure.
This indicates that the component has a wire connected to it that is connected to ground. RELAY (MagneticSwitch)-A (MagneticSwitch) -A relay is an electrical component that is activatedby electricity. Ithas a coilthat makes anelectromagnet whencurrent flowsthrough it. The electromagnet can openor closethe switch part ofthe relay.
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
CIRCUITBREAKER (C/B) (C/B)-A -A component in an electricalcircuit thatwill openthe circuit iftoo much current flowsthrough it. This does notdestroy thecircuit breaker andit can be reset to
