b30c adt electrics
DESCRIPTION
documentTRANSCRIPT
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 1
SPECIFICATIONS
The electrical system on the BELL machine is a very simple 24 V system with the
electrical supply from 2 x l2 V batteries or a 24 V alternator driven by the engine. The
power output from the alternator is regulated and maintains the batteries in a fully
charged state. The two batteries are connected in series to give 24 V
The specification data for the electrical system on the C SERIES ADT are as follows:
Electrical System
Voltage 24V
Battery Type 2X12 V, maintenance free
Battery capacity 100Ah
Starter motor capacity 4kW
Alternator voltage rating 24V
Alternator amperage rating 55A
Power Ratings (bulbs)
Headlight 24V75/70W
Front park light 24V2W
Front indicator light 24V21W
Number plate light 24V5W
Stop/tail light 24V21/5 W
Rear indicator light 24V21W
Reverse light 24V75W
Interior light 24V18W
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 2
OPERATOR CONTROLS AND INSTRUMENTS
The following figure details the layout of the controls and instruments in the cab for the
B25C:
ITEM DESCRIPTION ITEM DESCRIPTION
1 Centre Panel (Instruments) 11 Trainer Seat
2 Right Panel (Controls) 12 Retarder pedal
3 Gear Shift Control lever 13 Document holder
4 Park/ Emergency brake control valve 14 Steering Column Switch
5 Bin Tip Control Lever 15 Electrical Distribution Box Cover plate
6 Air Conditioner Control Panel 16 Steering Wheel Adj Lever
7 Windscreen Washer Bottle 17 Air/ Air Conditioner Vent
8 Accelerator Pedal
9 Service Brake Pedal
10 Operators Seat
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 3
The following figure details the electrical distribution box front panel:
1. 20 A circuit breaker (CB9) 5. 15 A circuit breaker (CB5)
2. 5 A circuit breaker (CB8) 6. 15 A circuit breaker (CB4)
3. 20 A circuit breaker (CB7) 7. 15 A circuit breaker (CB3)
4. 30 A circuit breaker (CB6) 8. 5 A circuit breaker (CB2)
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 4
CONTROLS AND INSTRUMENTS
All the gauges, indicators, switches and controls are described in this chapter.
1. SPEEDOMETER.
The speedometer monitors the machine speed in kilometers per hour (km/h).
2. MAIN WARNING INDICATOR
The main warning indicator flashes to warn the operator of one or more of the following
conditions or problems with a machine system.
Low coolant level, High hydraulic fluid temperature, Low pneumatic system pressure,
Brake system failure, Emergency steering system in operation, Park/emergency brake
If one or more of the above faults occur, the respective warning indicator on the
dashboard will also flash when the main warning indicator flashes.
A warning buzzer also sounds when the main warning indicator flashes if the engine is
running (except for the park/emergency brake ON condition).
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 5
3. ENGINE OVERSPEED WARNING INDICATOR
The engine over speed warning indicator flashes and a warning buzzer sounds when the
engine speed exceeds 2 850 rev/min.
If the operator continues to over speed and the engine speed exceeds 2 950 rev/min the
following occurs:
The engine over speed warning indicator ceases flashing but stays illuminated.
The exhaust brake is automatically applied by the MFA 10
A caution symbol (D) flashes on the tachometer.
A louder buzzer sounds.
The error is logged into the MFA 10
4. TRANSMISSION DISPLAY SCREEN
The screen displays the transmissions current operation mode, the current gear selection
and error codes.
5.TACHOMETER
The tachometer monitors the engine speed in revolutions per minute rev/min).
Incorporated on the face of the tachometer is an LED caution sign (D). This sign is not
visible until an over speed situation is caused.
6. BRAKE SYSTEM LOW PRESSURE WARNING INDICATOR
The indicator flashes if the brake systems hydraulic pressure drops below 11mpa
(110bar)
Note: The main warning indicator and the warning buzzer are also activated with the
brake system low pressure warning indicator.
7. EMERGENCY STEERING WARNING INDICATOR
The emergency steering warning indicator flashes if there is an engine or main hydraulic
pump failure and the emergency steering is activated.
Note: The main warning indicator and the warning buzzer are also activated with the
emergency steering warning indicator.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 6
8. DIRECTION INDICATOR
The direction indicator will flash when the steering column switch is moved to indicate a
right turn.
If the hazard switch is ON, both direction indicators flash.
9. ALTERNATOR (CHARGE) WARNING INDICATOR
The warning indicator illuminates if the alternator is not charging the batteries or if the
engine is not running and the ignition switch is ON.The normal operating voltage is 24V.
10. DO NOT SHIFT WARNING INDICATOR
The do not shift warning indicator illuminates when there is a transmission problem or
failure.
Note: The do not shift warning indicator flashes briefly on start-up when the ignition key
is turned to the ON position.
If the do not shift warning indicator illuminates, check for error codes on the gear shift
control.
11. LOW PNEUMATIC PRESSURE WARNING INDICATOR
The low pneumatic pressure-warning indicator flashes when the air pressure in the
pneumatic tank is below 500 KPa (72.5 psi).
Note: The park/emergency brake cannot be re-leased until the air pressure in the tank is
allowed to build up to approximately 550 kPa (79.8 psi) and the low pneumatic pressure
indicator extinguishes.
12. Blank (Spare)
13. Blank (Spare)
14. HIGH HYDRAULIC FLUID TEMPERATURE WARNING INDICATOR
The high hydraulic fluid temperature warning indicator flashes when the hydraulic fluid
temperature exceeds 120C (248F).
If overheating occurs stop the machine, engage neutral and allow the engine to run at
1500 rev/min until the hydraulic temperature returns to normal temperature and the
warning indicator extinguishes.
Note: The main warning indicator and the warning buzzer are also activated with the high
hydraulic fluid temperature warning indicator.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 7
15. LOW ENGINE COOLANT LEVEL WARNING INDICATOR
The warning indicator flashes when the engine coolant requires replenishing immediately.
Note: The main warning indicator and the warning buzzer are also activated with the low
engine coolant level warning indicator.
Note: The low engine coolant level warning indicator may flash briefly on start-up when
the ignition key is turned to the ON position.
16. Blank (Spare)
17. High Beam Indicator
The indicator illuminates when the high beam mode on the headlights is selected on the
steering column switch.
18. Blank (Spare)
19. ROTATING BEACON WARNING INDICATOR
Note: The rotating beacon is optional equipment. (The wiring is standard)
The rotating beacon warning indicator illuminates when the warning beacon on top of the
cab is switched on.
20. BIN RAISED WARNING INDICATOR
CAUTION
When the bin is raised the machine can only operate in 1st gear and the exhaust
brake and retarder are inoperable.
The bin raised warning indicator will not extinguish until the bin is fully lowered.
21. EXHAUST BRAKE/ RETARDER WARNING INDICATOR
The exhaust brake/retarder warning indicator illuminates when the exhaust brake is
applied.
Note: The exhaust brake is automatically applied when the accelerator pedal is fully
released (and transmission lock-up is engaged). The exhaust brake is de-activated when
the accelerator pedal is re-applied (or the machine is out of lock-up mode). The exhaust
brake warning indicator then extinguishes.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 8
22. INTER-AXLE DIFFERENTIAL LOCK INDICATOR
The inter-axle differential lock indicator illuminates when the longitudinal differential lock is
engaged.
Note: The engine rev/min must be lower than 900 rev/min and the output shaft rotation
must be lower than 60 rev/min before the inter- axle will engage.
23. COLD START WARNING INDICATOR
The cold start function is automatic. When the ignition is switched on and the engine
coolant temperature is below 15C (59F), the warning indicator illuminates.
Note: The cold start warning indicator illuminates briefly on start-up, when the ignition key
is turned to the ON position.
When it is safe to start the engine, the cold start warning indicator extinguishes.
24. DIRECTION INDICATOR
The direction indicator will flash when the steering column switch is moved to indicate a
left turn.
If the hazard switch is ON, both direction indicators flash24P
25. PARK/EMERGENCY BRAKE WARNING INDICATOR
The park/emergency brake warning indicator illuminates when the park/emergency brake
is applied and extinguishes when it is released.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 9
MASTER DISPLAY UNIT
trip+ -
1
2
3
S005094
4
The MFA 10 (1) is located on the right side panel on the dashboard. The MFA 10
comprises of the digital display screen (2), two rows of buttons (3) and two rows of light
emitting diodes (LED) (4).
The buttons are manually operated to monitor the condition of machine systems and the
results of the selected monitoring function are displayed on the digital display screen.
The digital display screen displays two values, one value on the top line of the screen and
the other on the bottom line of the screen, in accordance with the top and bottom rows of
buttons.
The LEDs are red warning indicators or indicators for the relevant system being
monitored.
When the ignition is switched on the unit performs a brief self-test. If there is a problem
with one of the systems tested the relevant LED flashes and the relevant value is
displayed on the digital display screen.
Note: Every error which is encountered by the master display unit is logged and stored in
the units computer. The computer can store 250 errors per function (system).
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 10
DEFAULT DISPLAY
When the ignition switch is turned on and the self-test is completed, the digital display
screen displays two values as follows:
trip+ -
1
S005095
2
The amount of fuel in the fuel tank is displayed on the top of the screen (1). The amount of
fuel is displayed in litres.
Note: The fuel tank capacity is 215 litres (56.8 USGAL).
The number of hours that the engine has been in operation is displayed on the bottom
line of the screen (2).
Note: The engine operation hours are also referred to as the SMR (Service Meter
Reading) and it is this reading which is used to determine the service intervals as detailed
in the service guide. (RSG Recommended Service Guide)
When one of the buttons on the top row is pressed, the value for that particular system is
displayed on the top line of the screen.
When one of the buttons on the bottom row is pressed, the value for that particular system
is displayed on the bottom line of the screen.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 11
The relevant LED illuminates to indicate which system button has been pressed and thus
which system is being monitored.
Pressing a button again will cause the display to revert to the default display.
When a critical value of any of the monitored functions is reached, its value on the LCD
screen overrides any other function displayed at that time. In conjunction with the
displayed value, the critical functions LED is activated together with a warning buzzer to
alert the operator to the problem.
The buttons and their functions are as follows:
trip+ -
1
S005095
2
TOP DISPLAY
BOTTOM DISPLAY
4
5
678
9
10
11
12
3
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 12
1. TOP DISPLAY
This indicates the value of the relevant button pushed on the top row.
2. BOTTOM DISPLAY
This indicates the value of the relevant button pushed on the bottom row.
3. AIR PRESSURE SYSTEM BUTTON
When the system air pressure button is pressed the air pressure is displayed in bars on
the top line of the digital display screen and the relevant LED illuminates.
The normal operating pressure is 8 bar (800 kPa or 116 psi).
When the system air pressure button is pressed again the display for the air pressure is
cancelled and default is displayed.
The operator is warned of a low system air pressure as follows:
If the air pressure reaches 5 bar (500 kPa or 72.5 psi):
The pressure displayed on the screen flashes.
The LED flashes.
A warning buzzer sounds intermittently.
If the air pressure reaches 4.5 bar (450 kPa or 65psi):
The display and the LED cease flashing but re-main illuminated.
The warning buzzer sounds continuously.
The error is logged in the units computer and stored in its memory.
4. FUEL BUTTON
When the fuel button is pressed the amount of fuel in the fuel tank is displayed in litres on
the top line of the digital display screen and the relevant LED illuminates.
The fuel tank capacity is 215 litres (56.8 USGAL).
The operator is warned of low fuel as follows:
If the fuel in the tank reaches a level of 20 litres (5.3 USGAL):
The fuel level displayed on the screen flashes.
The LED flashes.
A warning buzzer sounds intermittently.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 13
If the fuel in the tank reaches a level of 10 litres (2.6 USGAL):
The display and the LED cease flashing but re-main illuminated.
The warning buzzer sounds continuously.
The error is logged in the units computer and stored in its memory.
5. SPARE
6. TRIP BUTTON
When the trip button is pressed the display at the bottom of the digital display screen is
zeroed for the trip meter mode and the relevant LED illuminates.
The number of kilometer traveled (since zeroing) is counted up as the machine is
travelling. When the trip button is pressed again the trip meter mode is cancelled and the
default is displayed.
7. SYSTEM VOLTAGE BUTTON
When the system voltage button is pressed the electrical system voltage is displayed on
the bottom line of the digital display screen and the relevant LED illuminates.
The systems operating voltage is 24V. If the charge is low, check the battery charge
indicator, the alternator and the alternator drive belts.
8. BOTTOM ROW LEDS (Indicates a problem with a corresponding button or circuit)
9. ENGINE OIL PRESSURE BUTTON
When the engine oil pressure button is pressed the engine oil pressure is displayed in
bars on the bottom line of the digital display screen and the relevant LED illuminates.
The operating pressures are 3 bar (300 KPa or 43.5 psi) @ idle (650 rev/min) rising to 5
bar (500 KPa or 72.5 psi) @ 1 500 rev/min. At engine speeds higher than 1 500 rev/min
the pressure remains constant at 5 bar.When the engine oil pressure button is pressed
again the display for the engine oil pressure is cancelled and default is displayed.
The operator is warned of a low engine oil pressure as follows:
If the engine oil pressure reaches 100 KPa (14.5 psi):
The pressure displayed on the screen flashes.
The LED flashes.
A warning buzzer sounds intermittently.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 14
If the engine oil pressure reaches 50 kPa (7.25 psi):
The display and the LED cease flashing but re-main illuminated.
The warning buzzer sounds continuously.
The error is logged in the units computer and stored in its memory.
10. TRANSMISSION FLUID TEMPERATURE BUTTON
When the transmission fluid temperature button is pressed the transmission fluid
temperature is displayed in degrees Celsius (C) on the top line of the digital display
screen and the relevant LED illuminates.
When the transmission fluid temperature button is pressed again the display for the
transmission fluid temperature is cancelled and default is displayed.
The operator is warned of a high transmission fluid temperature as follows:
If the transmission fluid temperature reaches 135C (275F):
The temperature displayed on the screen flashes.
The LED flashes.
A warning buzzer sounds intermittently.
If the transmission fluid temperature reaches 145C (293F):
The display and the LED cease flashing but re-main illuminated.
The warning buzzer sounds continuously.
The error is logged in the units computer and stored in its memory.
11. ENGINE COOLANT TEMPERATURE BUTTON
When the engine coolant temperature button is pressed the engine coolant temperature is
displayed in degrees Celsius (C) on the top line of the digital display screen and the
relevant LED illuminates.
The normal operating temperature range is 85C to 95C (185F to 203F)
When the engine coolant temperature button is pressed again the display for the engine
coolant temperature is cancelled and default (fuel reading) is displayed.
The operator is warned of a high engine coolant temperature as follows:
If the engine coolant temperature reaches 98C (208F):
The temperature displayed on the screen flashes.
The LED flashes.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 15
A warning buzzer sounds intermittently.
If the engine coolant temperature reaches 105C (221F):
The display and the LED cease flashing but re-main illuminated.
The warning buzzer sounds continuously.
The error is logged in the units computer and stored in its memory.
12. TOP ROW LEDS (Indicates a problem with a corresponding button or circuit)
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 16
MFA 10 INSTUMENTATION THRESHOLDS AND WARNINGS
FIRST
THRESHOLD
FLASHING LED
INTERMITTENT
ALARM
SECOND
THRESHOLD
CONTINOUS
LED
CONTINOUS
ALARM
Transmission Temp. (converter out) C 134 144
Engine Temp. C 98 104
Fuel Level L 19 10
Engine Oil Pressure BAR 0.7 0.5
Air Pressure BAR 5 4.5
Remove and acknowledge warning by pressing the appropriate button for 5 seconds.
All second threshold warning occurrences (except fuel) are logged in the MFA 10 event
memory for later access.
ENGINE SPEED THRESHOLDS AND WARNINGS
FIRST
THRESHOLD
FLASHING LED
INTERMITTENT
ALARM
SECOND
THRESHOLD
CONTINOUS
LED
CONTINOUS
ALARM
Engine Speed RPM 2600 2700
Engine Over speed warning indicator
Main Warning Alarm
Automatic Application of Exh. Brake
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 17
WARNING LIGHT THRESHOLD AND INFORMATION
Cont.
Light
Flashing
Llight
Main
Warning
Alarm
Main
Warning
Indicator
1. Indicator Left
2. Cold start (if fitted)
3. Exhaust Brake
4. Rotating Beacon (if
fitted)
5. Park Brake
6. Diff. Lock
7. Bin-up
8. High beam
9. Accumulator Press. Bar 110
10. Emergency Steering Bar 5
11. Low Water Level
12. Hyd. Oil Temp. (B25
only)
C 120
13. Indicator Right
14. Charge Light
15. Do-Not-Shift
16. Air Pressure Bar 4.5
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 18
SWITCHES
A row of switches is located on the right side panel on the dashboard. There are nine
positions for switches on the panel. Each switch is manually operated to select a required
function.
Note: There are blanking plates fitted to the three end switch positions.
The switches and their functions are as follows:
S002398
1 2 3 4 5 6 7 8 9
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 19
1. INTERIOR LIGHT SWITCH
The interior light switch is used to operate the interior light on the roof of the cab.
The switch has two positions:
OFF; switch in the normal position.
ON; switch in the down position.
2. LIGHTS SWITCH
The light switch is used to operate the headlights, park lights, tail lights and number plate
light.
The lights switch has three positions:
OFF; switch in the normal position.
Park lights, taillights, number plate light and instrument panel lighting ON; switch in the
central position.
Headlights ON; switch in the down position.
Note: The park, tail, number plate and instrument panel lights will illuminate when the
lights switch is in the central position, even if the ignition switch is OFF. However the
ignition switch must be ON for the headlights to operate from the ignition switch in the
down position.
3. WINDSCREEN WIPER/WASHER SWITCH
The windscreen wiper/washer switch is used to operate the windscreen wiper motor and
the windscreen washer pump on the water bottle.
The switch has three positions:
OFF; switch in the normal position.
Windscreen wiper ON; switch in the centre position.
Windscreen washer ON; switch held in the down position.
Note: The switch is spring-loaded from the washer position to the central position.
4. ROTATING BEACON SWITCH
The rotating beacon switch is used to operate the warning beacon on the roof of the cab.
The switch has two positions:
OFF; switch in the normal position.
ON; switch in the down position.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 20
5. INTER-AXLE DIFFERENTIAL LOCK SWITCH
The inter-axle differential lock switch is used to apply the longitudinal lock in the transfer
case.
The switch has two positions:
OFF; switch in the normal position.
ON; switch in the down position.
Note: When the inter-axle differential lock is engaged the inter-axle differential lock
indicator on the instrument panel illuminates.
Note: The engine rev/min must be lower than 900 rev/min and the output shaft rotation
must be lower than 60 rev/min before the inter- axle will engage.
6. Hazard Indicators Switch
The hazard indicators switch is used to operate the direction indicators.
The switch has two positions:
OFF; switch in the normal position.
ON; switch in the down position.
When the switch is ON, both of the rear direction indicators and both of the front direction
indicators will flash.The two direction indicators on the instrument panel will also flash
when the hazard indicator switch is ON.
Note: The hazard indicators switch will operate the direction indicators and the direction
indicators when the ignition switch is ON or OFF.
7. SPARE
8. SPARE
9. SPARE
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 21
BATTERY DISCONNECT SWITCH
The battery disconnect switch (1) is located inside the battery box.The battery disconnect
switch is used to isolate the electrical power from the batteries to the machine.
CAUTION
Always switch OFF the battery disconnect switch when the engine is shut down
and the machine is left unattended. If the switch is left ON for long periods while the
engine is shut down, the batteries may become discharged.
CAUTION
Always switch OFF the battery disconnect switch before any maintenance or repair
is per-formed on the machines electrical system or any welding work is performed.
The battery disconnect switch has two positions, OFF and ON, the switch position is
clearly marked on the switchs face plate.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 22
IGNITION SWITCH
The ignition switch (1) is located on the right panel on the dashboard.
The ignition switch is key operated and has two positions, OFF and ON.
Note: The ignition switch will only operate if the battery disconnect switch is ON. Refer to
previous description.
When the ignition switch is switched ON, the following indicators illuminate or flash:
Main warning indicator.
Park/emergency brake indicator.
Emergency steering warning indicator.
Alternator warning indicator
Do not shift warning indicator.
Low pneumatic pressure warning indicator.
Low engine coolant warning indicator (flashes briefly).
Cold start indicator (optional).
Note: Transmission digital display unit, will display neutral (N)
Note: The park/emergency brake warning indicator will extinguish when the
park/emergency brake is re-leased. The other warning indicators will extinguish
when the engine is started.
When the ignition switch is switched OFF, the kill lever on the injection pump is activated
causing the engine to stop.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 23
START BUTTON
The start button (1) is located on the right panel on the dashboard.The start button is used
to activate the starter motor when starting the engine. Whenever the start button is kept
depressed the starter motor will be activated. Releasing the start button will de-activate
the starter motor.
CAUTION
Do not hold in the start button (operate the starter motor) for more than seventeen
seconds. If the engine does start during this period, wait one minute before
attempting again to start the engine. If the engine does not start after two attempts,
investigate the cause.
Note: The start button will only operate if the batteries disconnect switch and the ignition
switch are ON. The transmission also has to be in neutral. Refer to previous description.
BATTERY CIRCUIT BREAKER
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 24
The battery circuit breaker (1) is rated at 60 A and is located inside the batteries box.
The circuit breaker protects the machines electrical circuits from a possible overload
condition or fault from the batteries.
S002364
GEAR SHIFT CONTROL
The gear shift control is located on the right hand side of the cab.
The gear shift control comprises of the gear shift control lever (1), the automatic / manual
selector button (2) and gear selection identification plate.
The selector button is used to switch between manual and automatic modes.
The gear selection identification plate is a graphical representation of the gear shift gate.
V ( Forward ) , is used to select a forward gear.
N ( Neutral ) , is used to select neutral gear.
R ( Reverse ), is used to select reverse gear.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 25
AIR CONDITIONER
Note: The air conditioner is optional equipment.
F002139
2
1
The air conditioner (1) and the filter housing (2) are located on the right side of the cab.
The air conditioners control panel is located on the right of the cab and enables the
following functions:
Switch (1) controls the fresh air vent. When the switch is pressed the air vent is opened to
allow fresh air into the cab. When the fan speed knob (2) is turned in a clock-wise
direction, the fan speed is increased. A counter clockwise turn of the fan speed knob
decreases the fan speed. Air conditioner switch (3) switches the air conditioner on or off.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 26
Note: The air conditioner switch is optional. If an air conditioner is not fitted, the face plate
does not have the cut-out for the switch.
When the air conditioner switch is ON, and the fan switch is also ON, conditioned air is
circulated through the air vents.
When the temperature control knob (4) is turned in a clockwise direction, the air circulated
through the air vents is progressively warmed. When the temperature control knob is
turned in a counter clockwise direction, the air circulated through the air vents is
progressively cooled.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 27
ELECTRICAL EARTHING CONNECTIONS CHASSIS
Incorrect earth procedure is a major cause of electrical faults on machines.
It is of major importance to clean off all paint and rust at the earth points.
Bare shiny metal must be visible where the earth connector ring lug touches
the machine chassis. This especially important at points where a bolt is used
through a thin steel plate and there is no direct thread contact from the bolt to
the chassis. If a threaded boss is available as an earth point, it should be
used in preference to a hole through a plate.
The contact face of the boss should be cleaned off as for any other earth
point. Do not rely on just the bolt thread maintaining the contact.
Where possible use a sealer varnish to seal the completed earth point from
corrosion. A small amount of copper slip grease can be used on the bolt
thread if no sealer is available. This has a high metal content. Do not use
normal grease for the application as it is non-conductive.
Symptoms of bad earthing can be electrical problems such as no selection of
gears or erratic functioning, solenoid/relays that do not hold in properly, lights
glowing dully when other lights are operated.
EG: 1
Park lights glow when the brake lights are switched on:
It is noticed that the brake lights are also dull. This is due to a bad rear earth.
The brake lights find the path to earth through some other component-in this
case the park lights earthed on the front of the machine.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 28
EG: 2
An ignition solenoid will not switch on properly and makes a clattering sound:
When the ignition key is turned it gives an earth to the ignition solenoid coil. If there is
paint between the earth lug and the chassis a very small area of metal makes
contact. This area has electrical resistance causing a volt drop. The coil of the
solenoid sees a voltage level which borderline with its minimum operating
specification causing the spring to overcome the coils magnetic field opening the
contacts again. This operation repeats its self causing the solenoid contacts to open
and close repeatedly until the ignition switch is switched off.
SOLUTION:
In both cases clean the paint or corrosion off the offending earth point and ensure
maximum metal to lug contact. Apply suitable corrosion prevention material to maintain
contact integrity.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 29
FAULT FINDING
Some general hints:
Equipment: All that is normally required is a multi-meter.
Never look at the whole wiring on a machine. There are enough wires on a
BELL machine to confuse most people. If the indicators are not working, forget
about the other circuits and concentrate only on the indicators. Try to picture
how the current should flow through the circuit. E.g. Current flows from positive
to a circuit breaker to the loaded to earth.
A component is more likely to give trouble than a wire. Dont try swapping
around. If the machine was working with the wires connected that way, then
connections must be correct.
Check connectors for loose or corroded connections. A quick squirt with Q20
(anti corrosion solvent ) will often cure this.
An alternator has 2, 3 or 4 connections, depending on the vehicle. These are:
D + Terminal : a yellow wire that comes form the dash warning light.
W Terminal :an unrectified stator terminal that operates the revcounter.
B+ Terminal : the main charge wire to the battery.
B- Terminal : an extra earth terminal. This is necessary when thealternator is rubber mounted.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 30
CIRCUIT BREAKERS
The circuit breakers used by bell are of the thermal type. When they heat up
due to current flow they trip. A 15 AMP circuit breaker will continuously handle
the amount of heat generated by a 15 AMP current without tripping.
If a circuit breaker is a little over its it will not trip immediately. The further over
its limit it becomes, the faster it will trip.
In the event of a short circuit the breaker will trip almost instantaneously due to
the almost instantaneous heat generated by a large current.
These facts can be used to advantage trouble shooting. I.e. if the circuit breaker
trips after 5 minutes or only a while after things are switched on, then the
problem is that of an overloaded circuit. This is usually where non-factory fitted
electrical components have been installed, or a device such as a wiper motor
has jammed allowing a moderate current flow but not a dead short.
If the circuit breaker trips within a few seconds the problem is that of a dead
short positive wires direct to machine chassis. In this case look for broken
wires on the relevant circuit or external damage. To the harness causing
internal shorts or disconnected terminals touching a metal part of the machine.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 31
RELAYS
Relays can be referred to as a remote switch, which can handle a highercurrent flow. A relay has five pins:
30- Ignition or battery positive or this can be a earth.
87a- Load normally closed.
87 - Load normally open.
85 - Signal or trigger.
86 - Signal or trigger.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 32
ELECTRICAL EQUIPMENT TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE REMEDY
Right turn indicator does notwork.
Bulb defective.Loose or brokenconnections.Indicator stalk switchdefective.
Change the bulb.Change the indicator stalkswitch.Tighten or repairconnections.
Left turn indicator does notwork.
Bulb defective.Loose or brokenconnections.Indicator stalk switchdefective.
Change the bulb.Change the indicator stalkswitch.Tighten or repairconnections.
Windscreen wiper does notoperate.
Wiper arm jamming motor.Wiper switch defective.Wiper motor defective.Loose or brokenconnections.
Release arm and blade.Change the wiper switch.Change the wiper motor.Tighten or repairconnections.
Charge warning light not onwith master switch on andengine stopped.
Warning light bulb defective.Wiring and connectorsdisconnected.Regulator on alternatordefective.
Change the bulbCheck/repairChange the alternator.
Charge warning light not offwith engine running
Alternator drive belt loose orbroken.Regulator on alternatordefective.
Adjust drive belt tension or fitnew drive belt.Change the alternator.
Charge warning light not offwith engine running.
Alternator drive belt loose orbroken.Regulator on alternatordefective.Alternator defective.Poor battery connections.
Adjust drive tension or fitnew drive belt.Change the alternator.Change the alternator.Clean and check batteryconnections.
Batteries do not hold charge. Battery cells dry.Battery defective.Short running times withlights in use.
Check battery electrolyteand top up.Change the battery.Remove and charge thebatteries or install fullycharged batteries.
Batteries boiling dry fromover charging.
Regulator on alternatordefective.
Change the alternator andtop up the electrolyte in thebatteries.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 33
ELECTRICAL EQUIPMENT TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE REMEDY
Starter motor does not turnor turns very slowly.
Flat batteries.Worn brush gear.Batteries defective ordamaged.Battery terminals loose orcorroded.Starter motor defective ordamaged.Starter button defective ordamaged.Starter bushes worn grinding rotor on field coils.
Recharge or change thebatteries.Change the batteries.
Tighten and/or clean thebattery terminals.Change the starter motor.
Change the starter button.
Starter motor turns but doesnot turn the engine.
Starter motor defective ordamaged (solenoid stickynot engaging.
Change the starter motor.
Starter motor does notdisengage after the enginehas started.
Starter motor defective ordamaged (jammed bendixgear)Starter button defective ordamaged.
Change the starter motor.
Change the starter button.
Starter motor does not turn(shift lever in neutral).
Gear shift faulty.neutral switch/neutral relay.
Check gear shift and changeor repair as necessary.Check in-line fuse andreplace.
Gauge not working properly. Loose or brokenconnections.Sender defective.Gauge defective.
Tighten or repair theconnection.Change the sender.Change the gauge.
Switch not working properly Loose or brokenconnections.Switch defective.Component defective.
Tighten or repair theconnection.Change the Switch.Change the component
Warning light not workingproperly.
Warning light bulb defective.
Circuit breaker tripped.Loose or brokenconnections.
Change the warning lightbulb.Investigate cause and reset.Tighten or repair theconnection.
-
B30C ADT
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 34
EARTH POINTS R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 35
STARTING & CHARGING CIRCUIT R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 36
VEHICLE INTERFACE UNIT WARNING CIRCUIT R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 37
MFA 10 & OVERREV CIRCUIT R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 38
HEADLIGHT CIRCUIT R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 39
INDICATOR / HAZARD CIRCUIT R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 40
REVERSE / STOP LIGHT & HORN CICUITS R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 41
AIRCON / BLOWER CIRCUIT R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 42
BLOWER AND WIPER CIRCUIT R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 43
COLD START / ROTATING BEACON / CIG. LIGHTER CICUIT R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 44
RADIO CIRCUIT ( OPTIONAL ) R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 45
BIN / PARK BRAKE / KICK DOWN CIRCUITS R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 46
EST 37 ELECTRICAL CIRCUIT R3
12
70
08
17
12
-BP
00
99
99
TRAN
SMISS
ION
EST 3
7M
ICRO
PROC
ESSOR
TRAN
SMISSIO
N
11
410
1114
83
12
112
RETA
RD
ER / EX
HA
UST
BR
AKEDIFF
LOC
KS
OLEN
OID
LOC
K UP V
ALVE
LOA
D SEN
SOR
(TPS) DIFFER
ENC
E PRESS
URE FILTER
SWITC
H
SEN
SO
R RETA
RD
ER
TEMP
INTER
NA
L GE
AR
CH
AIN
SPEED
PIC
K U
P
TUR
BINE SP
EED P
ICK UP
ENG
INE SPE
ED P
ICK
UP
OU
TPU
T SPEED
SENSO
R
DIA
GN
OSTIC
PLU
G
CA
N IN
TERFA
CE
37 W
AY CANNO
N C
ONNEC
TOR
DISP
LAY SC
REE
N
A7
A5
A6
B4
B6 Y7
Y8
Y9
S10 B9 B3
B2
B1
SHIFT LEVER
(VTS-3)
A2
VP
VNRT+T-OPTIO
NA
L B3
10
37
19
39
B3
31
42
43
R2
74
1
GN 0.5
BL 1
.5P...........
IGN
ITION
NEU
TRA
L SIGN
AL
REV
ERSE
SIG
NA
L
DIFF
LOC
K S
WITC
HB
ATTE
RYB
ATTE
RYB
IN U
P RELA
YD
O N
OT SH
IFT LIGH
T
EA
RTHE
ARTH
KIC
KD
OW
N SW
ITCH
SPEED
O
RD
1.5
RD
1.5
IGN
ITION
BN
/RD
1.5
WH
/RD
1.5
GN
/BL 1.5
GN
1.5
GN
1.5
BN
/BL 1.5
GY 1.5
BK 2
.5B
K 2.5
BK/W
H 1.5
WH
1.5
800
804
808
820
828
83
68
40
84
4
85
68
52
86
0
87
28
76
83
2
12346 5789101
11
21
31
41
51
61
71
81
92
02
12
2
12346 5789101
11
21
31
41
51
61
71
81
920212
2
Y8
Y9
PAR
K BRA
KE SW
ITCH
OR/G
N 1.5
P3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 47
ELECTRIC MIRROR CIRCUITS R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 48
HYDRAULIC COOLER AND REV WARNING CIRCUITS R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 49
CONNECTORS P01 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 50
CONNECTORS P02/03 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 51
CONNECTORS P04/P05/P06/P07 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 52
CONNECTORS P08/P09/P10/P11 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 53
CONNECTORS P12/P13/P14 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 54
CONNECTORS P15/P16/P17 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 55
CONNECTORS P18/P19/P20/P21 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 56
CONNECTORS P22/P23/P24/P25 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 57
CONNECTORS P26/P27/P28/P29/P30 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 58
CONNECTORS P31/P32/P33/P34/P35/P36 R3
-
B30C
ELECTRICAL
COPYRIGHT REFERENCE PAGE
BELL TRAINING 2000 ELECTRICAL 59
CONNECTORS P37/P38/P39/P40 R3