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8/25/2021

Taylor-Dunn TT-416 Vehicle Controls

The information in this article applies to standard TT-416 Taylor-Dunn vehicles – model number TT-416-36AC. Note that vehicle customization may cause variation from the information in this article.

The TT-416 tow tractor is shown below. 

TT-416

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. 

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 and place the direction control switch in the center OFF position. 

2. Directional Control Switch: This switch determines the direction of travel and has an indicator light on the switch. The switch has three positions: 

  • FORWARD: Rotate the switch clockwise to travel forward. Light will be GREEN. 
  • REVERSE: Rotate the switch counterclockwise to travel reverse. Light will be RED. 
  • OFF: There is a center position between forward and reverse; this is the “direction” OFF position. The light will be OFF. 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 in your Vehicle Operator and Service Manual for details on turning the vehicle control system OFF. 

3. Combination Dash Display: The gauge on the dash has many functions. The display will cycle through the functions while the vehicle is in operation. The gauge will stay on each screen for about 2 seconds before switching to the next screen. 

Assuming there are no active faults detected on startup (shown on the display as Diagnostic Trouble Code or DTC), the display will show the current battery charge status and total accumulated hours of operation. If there are active faults, then the display will scroll through all detected faults. Note: Some single events will result in more than one DTC generated. 

The following is an explanation of the different modes of the display depending on the current operating conditions.  

Direction Indicator: The display will indicate direction selected for 1 seconds after the direction is selected and then switch to the BSI/Speed mode. 

DTC indicator

Fault Messages (Diagnostic Trouble Code/DTC): The display enters this mode any time the system detects a fault condition. It will show the Diagnostic Trouble Code (DTC) as well as a brief description of the fault. If there are multiple faults, the display will flash each fault for 2 seconds. 

DTC code

Shown above is DTC F59, which is a type of SRO fault. It will be in this mode until all fault conditions are resolved. 

A code table is provided in the Troubleshooting section in the Vehicle Operator and Service Manual. More information can also be found in Taylor-Dunn Fault Codes

Battery Status/Hour Meter: This mode will be active only when the direction control switch is in the center OFF position. 

At 15 percent charge remaining, the vehicle speed will be limited and “BDI CUT” will be displayed. 

battery status indicator

BSI/Speed: This is the mode shown during operation of the vehicle. The speed is selectable for mph or km/h and can be changed by your dealer. 

speed

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

5. 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. 

6. Horn Switch: Press the horn switch to sound the horn; release it to turn it off. 

Work Light 

work light

The optional overhead light bar is available with a rear-facing work light. 

The switch for the work light is located on the light bar on the top right side, facing forward. Toggle the switch up to turn it ON and down to turn it OFF. 

The light should be left OFF while the vehicle is in operation unless being used to assist in connecting a trailer or cart.  

Steering  

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. 

Tilt Steering: The steering wheel angle can be adjusted. Push the locking lever to release and then move the steering wheel to the desired angle and release the lever. 

Throttle/Brake Treadle 

treadle
The treadle located on the right side of the operator platform is both the brake and throttle. It is operated by the driver’s right foot. 

Press the rear of the treadle with your heel to apply the brake. 

Press forward on the treadle to accelerate. The brake will be released when accelerating. 

Operator Presence Switch (OPS): A switch located under the operator platform disables the power to the vehicle when the driver exits the vehicle. The driver must be in the approved operator position for the vehicle to operate. 

Emergency Stop Switch (ESS): Pushing on an emergency stop switch knob will immediately and abruptly stop the vehicle. Rotate the knob clockwise to reset and continue normal vehicle operation. 

The ESS should only be activated if the vehicle must be immediately stopped. Do not use the switch when only parking the vehicle. 

Note: Operating the switch while in motion will result in accelerated wear and premature failure of the parking brake. Unless in an emergency, do not activate an ESS while the vehicle is in motion. This vehicle is equipped with an automatic electric parking brake. Activating the ESS 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. 

Warning: DO NOT use the ESS knob as a post to hang any item, such as a purse or backpack. Using the knob as a hanging hook may interfere with operation of the knob or cause the ESS to be activated by accident. Both may result in severe bodily injury and/or property damage. 

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

During normal operation, the parking brake will be applied when the treadle is released and the motor comes to a stop. The brake will release again when the treadle is pressed for travel. 

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 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, drive wheels must be placed on a towing dolly or the brake removed from the motor. 

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. 

INTERLOCKS

treadle 
Operator Presence (OPS): A switch located under the operator platform disables the power to the vehicle when the driver exits the vehicle. The driver must be 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 forward-off-reverse switch in the center OFF position. 

Battery Door: Two switches located on the left and right to the rear of the battery compartment 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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