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POLARIS COMMERCIAL
CENTRE D'AIDE
8/25/2021

Taylor-Dunn TT-316 AC Vehicle Controls

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

The TT-316 tow tractor is shown below.

TT-316 vehicle

VEHICLE CONTROLS

vehicle controls

1. 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. 

2. Directional Control Switch: This switch determines the direction of travel. The switch has three positions:  

  • FORWARD: Rotate the switch clockwise to travel forward.  
  • REVERSE: Rotate the switch counterclockwise 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. 

3. System Status Indicator Gauge: Detailed description of operation can be found later in this section. 

4. Headlight Switch: Push the forward side of the headlight switch down to turn the lights ON. Push the opposite side of the switch down to turn the lights OFF. 

brake pedal

5. 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. 

6. 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. 

7. Horn Switch: Press the horn switch with your left foot to sound the horn; release it to turn it 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 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

OPERATOR CONTROLS

Steering

locking lever

To turn right, turn the steering wheel clockwise. To turn left, turn the steering wheel counterclockwise. The steering column has both tilt and telescoping features.  

  • Tilt: To tilt the steering up or down, loosen the locking lever, position the steering wheel as required and retighten the lever.  
  • Telescoping: Pull or push on the steering wheel to extend or collapse the column. There is no locking mechanism for the telescoping feature of the steering column. 

Parking Brake: 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 again 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, stop the vehicle and result in accelerated wear of the brake. 

Parking Brake Bypass Switch

Warning: The park brake bypass switch shall only be operated by properly trained and authorized service personnel. Improper usage of the bypass switch cause loss of control of the vehicle resulting in severe bodily injury and/or collision with property damage Refer to the Vehicle Operator and Service Manual for details. 

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. 

Some motor control system faults will result in application of the parking brake or failure of the brake to release. Should this occur, contact trained, authorized service personnel to repair the vehicle or tow the vehicle to a service center. Refer to Towing This Vehicle section in your Vehicle Operator and Service Manual for more information. 

Inching 

inching

The inching switches are optional. The inching buttons are located on the left side of the cargo area. The inching buttons will move the vehicle a short distance at a slow speed to facilitate connecting or disconnecting the trailer tongue.  

The inching buttons are active only when all the following apply:  

  • The vehicle start switch is ON.  
  • The direction control switch is in the center OFF position.  
  • The driver seat is not occupied.  

To disconnect the trailer, release the tongue latching lever or pin and press the FORWARD inching button until the tongue is clear from the vehicle hitch. To connect the trailer, park the vehicle so that the hitch is close to and in line with the trailer tongue. Release the tongue-latching lever and press the REVERSE inching button to move the vehicle hitch to engage the tongue. Make sure the hitch-latching mechanism is properly engaged before operating the vehicle. 

Warning: Do not attempt to connect or disconnect a trailer while parked on a grade. This may result in the trailer's uncontrolled travel down the grade and/or crushing the person between the trailer and vehicle. 

Warning: PINCH POINT. Keep hands clear of the hitch and trailer tongue while coupling or de-coupling. Fingers or hands may be crushed if pinched between the trailer and hitch. 

For more information, refer to your Vehicle Operator and Service Manual

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