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8/25/2021

Taylor-Dunn C-426 AC Vehicle Controls

The information in this article applies to standard C-426 with Sevcon DC system vehicles – model number C0-426-48AC. Note that vehicle customization may cause variation from the information in this article.

The Taylor-Dunn C-426 tow tractor is shown below.

C-426 vehicle

VEHICLE CONTROLS

vehicle controls

1. Start Switch: The start switch turns the vehicle electrical control system ON. Insert the key and rotate the switch clockwise to turn the vehicle system ON and counterclockwise to turn the vehicle system OFF. The vehicle will not run when in the OFF position. The switch should be in the OFF position whenever the operator leaves the driver’s seat. This switch is designed to secure and disable the vehicle. The key can only be removed when the switch is in the OFF position. 

2. Direction Control Switch: The direction control switch determines the direction of travel.  

The switch has three positions:  

  • FORWARD: Push the top of the switch all the way in to travel forward.  
  • REVERSE: Push the bottom of the switch all the way in to travel reverse. 
  • OFF: There is a center position between forward and reverse; this is the “direction” OFF position. The direction OFF position does NOT turn the vehicle control system OFF. Use the start switch to turn the vehicle control system OFF. Refer to the start switch entry in this section for details regarding turning the vehicle control system OFF.

3. Headlight Switch: Push the top of the headlight switch to turn the lights ON. Push the bottom of the switch to turn the lights OFF. 

4. Hi-Low Speed Switch: Push the top of the switch (turtle) for slow speed. Push the bottom of the switch (rabbit) for normal speed. 

5. Dash Display: The dash gauge has many functions.  

The display will cycle through the functions while the vehicle is in operation. Some functions may not be displayed, depending on the current situation of the vehicle. 

dash display

Battery Status Indicator: Bar Graph 
There are five LEDs at the bottom of the gauge. Each LED represents an approximate state of charge as listed below:  

  • #5 (far right) LED (green): When on, represents 84 to 100 percent charge remaining.  
  • #4 LED (green): When on, represents 68 to 84 percent charge remaining.  
  • #3 LED (green): When on, represents 52 to 67 percent charge remaining.  
  • #2 LED (yellow): When on, represents 36 to 52 percent charge remaining.  
  • #1 LED (red): When on, represents 20 to 36 remaining. When flashing, represents 0 to 20 percent charge remaining.  

If the #1 LED is flashing, the vehicle or battery should be immediately removed from service to be recharged. Discharging beyond 20 percent will damage the battery.  

Once discharged, the indicator will not reset to full until the battery is charged and the battery voltage exceeds the reset voltage threshold programmed in the controller. The reset voltage threshold can be viewed using the controller handset and is part of the battery parameter set. 

Speedometer: The speedometer indicates the vehicle’s current rate of travel in miles per hour. 

Hour Meter: The hour meter displays total time (whole hours) the vehicle has been in operation. Time is accumulated only while the vehicle is moving. The example above indicates that the vehicle has been in operation for 2,114 hours.  

System Fault Monitor: If the system detects a fault, an abbreviated fault message will be displayed. Refer to the table below. 

Fault Code Description Note
(Corresponds to the numbers below)
CRTL FLT Speed controller internal fault or wiring fault 1
CRTL TMP Speed controller overheated 3
EMB FLT Electric brake fault 1
FB OR Foot brake switch is closed 1
HIGH V High battery voltage  
LOCK Electromagnetic motor brake is applied  
LOW V Low battery voltage  
MOTR TMP Motor overheated 3
MOTR FLT Faulty motor or wiring 1
SEAT OFF Seat interlock switch is open 1
SRO FLT Operator error 2
STALL Motor stalled 4

1. Check position of brake bypass switch. Refer repair to a qualified technician.  

2. Switches used to operate vehicle may have been selected in the incorrect sequence. Refer to operator instructions in this section.  

3. Wait for component to cool. Vehicle may be overloaded.  

4. Vehicle overloaded, faulty motor or possible locked up brakes or transmission. If vehicle is not overloaded, refer repair to a qualified technician. 

OPERATOR CONTROLS 

Emergency Stop Switch 

emergency stop switch

Pushing on the emergency stop switch will immediately and abruptly stop the vehicle. Pull the knob back out to continue normal vehicle operation. The switch is a red mushroom knob located to the left of the instrument panel. The emergency stop switch should only be activated if the vehicle must be immediately stopped. Do not use the switch when only parking the vehicle. 

Caution: Unless in an emergency, do not activate the emergency stop switch while the vehicle is in motion. This vehicle is equipped with an automatic electric parking brake. Activating the emergency stop switch will immediately apply the brake and abruptly stop the vehicle. This may result in injury to the occupants and/or upsetting the load being carried or towed. 

Note: Operating the switch while in motion will result in accelerated wear and premature failure of the parking brake. 

Horn Switch: The horn switch is located on the floorboard and is operated by the driver’s left foot. Press the horn switch to sound the horn; release it to turn it off. 

horn switch

Interlocks 
Operator Presence Interlock: A switch located under the driver’s seat disables the power to the vehicle when the driver leaves the seat. The driver must be seated in the approved operator position for the vehicle to operate. Whenever the driver leaves the vehicle, the driver should turn the key switch off and place the direction control switch in the center OFF position. 

Warning: Do not dismount the operator’s seat while the vehicle is in motion. Getting off the seat will activate the Operator Presence circuit, rapidly slowing the vehicle and applying the park brake. The abrupt slowing of the vehicle may result in severe bodily injury. 

Throttle Pedal, Foot Brake Pedal and Steering 

steering

1. Throttle Pedal: The throttle pedal is located to the right of the brake pedal. It controls the speed of the vehicle and operates like the throttle pedal in an automobile. 

Press the pedal to increase speed and release the pedal to decrease speed. 

2. Foot Brake Pedal: The foot brake pedal is located to the left of the throttle pedal. This pedal is designed for operation with the driver’s right foot. It works like the brake in an automobile.  

Applying pressure to the brake pedal slows the vehicle according to the amount of pressure applied. Relieving pressure from the pedal releases the braking action. 

3. Steering: The steering wheel and steering system are like an automobile.  

To turn right, turn the steering wheel clockwise. To turn left, turn the steering wheel counterclockwise. 

Parking Brake, Automatic 
This vehicle is equipped with an automatically actuated electromagnetic parking brake.  

During normal operation, the parking brake will be applied when the throttle pedal is released and the motor comes to a stop. The brake will release when the throttle pedal is pressed.  

Unless in an emergency, do not turn the start switch OFF while the vehicle is in motion. Turning the start switch OFF will immediately apply the parking brake, stopping the vehicle and resulting in accelerated wear of the brake.  

Some motor control system faults will result in parking brake application or failure of the brake to release. Should this occur, there is a brake bypass switch that will release the brake and allow the vehicle to be moved. 

For more information, refer to the Towing This Vehicle section in the Vehicle Operator and Service Manual. The brake bypass switch will not function if the batteries are disconnected or there is a failure in the vehicle power supply. Should this occur and the vehicle must be moved, then the drive wheels must be placed on a towing dolly or the brake removed from the motor. 

For more information, refer to the Vehicle Operator and Service Manual.  
To service your vehicle, see an authorized Taylor-Dunn Dealer. To find a dealer near you, use the Dealer Locator.  

Keyword(s) gauge , display , switch , dash , light ,