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8/25/2021

Taylor-Dunn C-425 Vehicle Controls

The information in this article applies to standard C-425 with Sevcon DC system vehicles – model number C0-425-48. Note that vehicle customization may cause variation from the information in this article.

The Taylor-Dunn C-425 tow tractor is shown below.

C-425 tow tractor

VEHICLE CONTROLS 

Start Switch: The start switch turns the vehicle electrical control system ON. This switch may or may not require a key to operate. 

start switch

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.  

This switch is designed to secure and disable the vehicle. The key can only be removed when the switch is in the OFF position.  

Before leaving the approved operator position, turn the start switch OFF, place the direction control switch in the center OFF position and set the park brake.  

Direction Control Switch: This switch determines the direction of travel. 

direction control

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 in 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 start switch entry in this section for details regarding turning the vehicle control system OFF. 

Note: The OFF position in NOT neutral and does NOT disconnect the motor from the drive train. 

Hi-Low Speed Switch 

hi-low speed

Push on top of the switch (turtle) for slow speed. Push on the bottom of the switch (rabbit) for normal speed. 

Headlight Switch

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.

Smart View Display: The Smart View Display (SVD) functions as a Battery Status Indicator (BSI), hour meter (HM), speed controller status monitor and an optional maintenance monitor feature. The operation of each of these functions is described below. 

SmartView display

Battery Status Indicator: A bar graph representing the current state of charge is located across the top of the display. When the batteries are fully charged, all segments of the bar graph will be on. As the batteries are used, segments will turn off from right to left.  

When the batteries are discharged to 75 percent (25 percent battery remaining), the last three segments will flash, indicating that you are approaching the end of the battery cycle. At this time, the vehicle’s batteries should be charged as soon as possible.  

At 90 percent (10 percent battery remaining), all segments will flash and the vehicle's speed will be reduced. At this time, the vehicle should be removed from service for charging. Discharging beyond 90 percent will result in damage to the batteries that will shorten the battery life span.  

Note: The battery status gauge, as well as any faults indicating low battery voltage, will not reset until the batteries have successfully completed a charging cycle. 

Hour Meter: Depending on the revision level of the controller, there are one or two hour meter functions – Key Hours and Run Time Hours.

Run Time Hours is represented by a motor symbol with a “T” in the center and indicates the accumulated length of time that the vehicle has been in operation. Time is accumulated when the FS-1 switch in the accelerator module is closed. The Run Time Hours will be displayed as indicated by the Run Time Hours Indicator located at the left of the display.

System Fault Monitor: The display will indicate a fault code whenever the control system logic detects a problem with the control system. A fault code is being displayed whenever the Fault Code Indicator (the letter "F") is visible at the left of the numeric display. Refer to the fault code table in your Vehicle Operator and Service Manual or read Taylor-Dunn Fault Codes description of the fault codes. 

fault codes

Maintenance Monitor: The Maintenance Monitor function is optional. The Maintenance Monitor function can be turned on or off by your dealer. Contact your Taylor-Dunn Dealer to enable or disable this feature.

fault codes

Operation: The SVD notifies the operator 10 hours (standard) before a scheduled maintenance is due. During this warning period, the meter will continue to alert the operator. This should allow enough time for the operator to schedule the maintenance that is due with minimal downtime. If the scheduled maintenance is not performed before the warning period elapses, then the vehicle's maximum speed will be significantly reduced. 

Warning Period: The warning starts when the Maintenance Indicator is ON and the Wrench icon is flashing. The Wrench icon will continue to flash until the warning time has expired.

Maintenance Due: Once the warning has expired and the maintenance is due, the Wrench icon will stop flashing and remain on. Additionally, the vehicle's maximum speed will be significantly reduced until the maintenance is performed and the display is reset. The display should only be reset by an authorized technician. Refer to the illustrated parts section of the Vehicle Operator and Service Manual for information regarding tools required to reset the Smart View Display.

Speed Controller Status: The display will indicate a fault code whenever the control system logic detects a problem with the control system. A fault code is displayed whenever the Fault Code Indicator (the letter "F") is visible at the left of the numeric display.

fault codes

Refer to the fault code table in your Vehicle Operator and Service Manual or read Taylor-Dunn Fault Codes for descriptions of the fault codes. 

OPERATOR CONTROLS

operator controls

1. Turn Signal Switch: The turn signal switch lever is located on the left side of the steering column. PUSH the lever forward to activate the right turn signal and PULL the lever back to activate the left turn signal. The switch is not self canceling. You must return the switch to the center OFF position after the turn is completed. 

2. Hazard Light Switch: The hazard light switch is located on the turn signal switch. The switch is a small tab or knob under the turn signal lever. To activate the hazard lights, pull the tab out. To turn the hazard lights off, push the turn signal lever forward or back. 

3. Tilt Lever: The tilt lever adjusts the position of the steering column.

tilt lever

1. 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. 

2. 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. 

3. 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. 

Horn Switch: Press the horn switch on the steering wheel to sound the horn; release it to turn it off. 

horn switch

Park Brake: The parking brake is actuated with a hand lever, which is located to the right of the driver. To set the parking brake, push down on the brake pedal and pull the lever up until it locks. Do the following to release the park brake: press the foot brake pedal, pull up on the park brake handle, push the release button and lower the handle. 

park brake

Battery Disconnect Switch: The battery disconnect switch is a red knob located to the right of the driver seat. To disconnect the battery from the control system, push down on the knob. Pull up on the knob to reconnect the battery. 

battery disconnect switch

Interlocks 
Operator Presence: A switch under the driver’s seat disables the power to the vehicle when the driver leaves the seat. The driver must be seated properly 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. The abrupt slowing of the vehicle may result in severe bodily injury. 

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.  

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