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8/25/2021

Taylor-Dunn TT-316 DC Vehicle Controls

The information in this article applies to standard TT-316 with DC Control System vehicles – model numbers TT-316-36. Note that vehicle customization may cause variation from the information in this article.

The TT-316 DC tow tractor is shown below. 

TT-316 DC vehicle

VEHICLE CONTROLS

TT-316 DC controls

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

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

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

Emergency Stop Switch: This control is optional. Pushing on the emergency stop switch will immediately and abruptly stop the vehicle. Pull the knob back out to continue normal vehicle operation. 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.  

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

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. 

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 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 Indicator is at the left of the display and represented by a motor symbol with a “T” in the center. 

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 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 for a 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 sufficient 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 maintenance is performed and the display is reset. The display should only be reset by an authorized technician. Refer to the illustrated parts section in your 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 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 for descriptions of the fault codes. 

fault codes

Direction Control Switch: This 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 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 the start switch entry in this section for details regarding turning the vehicle control system OFF. 

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

Horn, Foot Brake and Throttle Pedal

foot controls

1. Horn Switch: The horn switch is located on the left side of the floorboard. Press the switch with your left foot to sound the horn. Release it to turn it off. 

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. 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. 

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. 

Park Brake, Hand Operated: If your vehicle is equipped with the optional hand brake, the brake lever is located on the right side of the cowl. To apply the brake, pull back on the lever until it locks in position. To release the brake, push the lever forward until it stops. 

park brake

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. Warning: The park brake should be disabled for servicing or towing procedures only. Do not operate the vehicle while the automatic park brake is disabled. Operating the vehicle with the automatic park brake disabled could lead to severe bodily injury and/or property damage. 

Parking Brake, Automatic 

parking brake

The parking brake is optional. This vehicle may be equipped with an optional 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 again when the throttle pedal is pressed.  

Unless in an emergency, do not turn the start switch off while the vehicle is in motion. Turing the start switch off will immediately apply the parking brake, stop the vehicle and result 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 Towing This Vehicle section in your 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, the drive wheels must be placed on a towing dolly or the brake removed from the motor. 

Tilt Steering 

tilt steering

To tilt the steering up or down, loosen the locking handle, position the steering wheel as required and retighten the handle.  

Note: The locking handle can be repositioned by pulling the handle out and then rotating to the desired position. 

INTERLOCKS

Operator Presence: 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 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.  

Built-In Charger (optional): If equipped with a built-in charger, the charger interlock is designed to disable the vehicle from being driven while the AC charging cord is plugged into a functioning power source. This interlock is located inside the charger cabinet.  

Battery Door: Two switches located on the inner left and right side panels disable power to the vehicle whenever the battery doors are removed or not properly installed. 

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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