The information in this article applies to standard SC-90 Taylor-Dunn vehicles with a Curtis DC system – model number SC-090-24 (SC 0-90), 24-volt system. Note that vehicle customization may cause variation from the information in this article.
The SC-90 stockchaser is shown below.
1. 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.
2. Accessory Switches: The accessory switches are for optional features that can be added to your vehicle. The function of these switches will vary with the configuration of the vehicle.
3. 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 switch should be in the off position whenever the operator leaves the operator’s platform. This switch is designed to secure and disable the vehicle. The key can only be removed when the switch is in the off position.
4. Battery Status Indicator: The battery status indicator (BSI) may be analog or a digital bar graph.
Shown below is the Bar Graph BSI.
The battery status indicator has an LED bar graph that indicates the relative state of charge of the battery. The top LED will light only when connected to a fully-charged battery or after completing a charging cycle.
Successive lower LEDs will light as the battery charge diminishes. When the second-to-bottom LED flashes, the battery energy status is in energy reserve and should be placed on a charger as soon as possible.
When the two bottom LEDs are alternately flashing, the batteries are empty and the truck should be taken out of service and charged to avoid damaging the batteries. The BSI will reset to fully charged only after a complete charge cycle is completed. A complete charge cycle is defined as battery voltage exceeding 2.35 volts per cell for a minimum of 6 minutes.
Shown below is the Analog Battery Status Indicator.
The normal operating range is in the green zone.
Park the vehicle for a few minutes for an accurate reading. The vehicle needs charging if it is in the yellow zone.
During and immediately following charging, the needle will be in the red zone to the right. The needle will move through the green zone toward the yellow zone as the batteries discharge.
Charge the batteries when the needle is in the yellow zone. If it is in the red zone to the left, the batteries are empty and the truck should be taken out of service and charged to avoid damaging the batteries. More detail is provided in the Vehicle Operator and Service Manual.
5. Hour Meter: The hour meter will display actual driving time of the vehicle in hours.
6. 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: The OFF position is the center position between forward and reverse. 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.
Park Brake (Hand Operated): The parking brake is actuated with a hand lever, located on the left side of the steering tower. To set the parking brake, press the rear of the treadle and pull the lever up until it locks. To release the park brake, press the rear of the treadle and push the park brake handle down.
Note: The front of the treadle will be very difficult to press when the park brake is applied.
Horn Switch: The horn switch is located on the right side of the steering tower. Press the switch to sound the horn; release it to turn it off.
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.
Throttle/Brake Treadle and Operator Presence Switch
The treadle is under the operator’s right foot and controls the acceleration and braking of the vehicle. Using the ball of your right foot, press down on the front of the treadle to increase the speed of the vehicle. Using the heel of your right foot, press down on the rear of the treadle to apply the brake. Releasing the treadle will return it to the OFF position.
Operator Presence Switch: A switch located under the left floor plate disables the vehicle if the operator is not positioned properly. The operator's left foot must be positioned on the floor plate to operate the vehicle.
Power Cut Switch
This switch is optional. Pushing on the power cut switch disconnects main power from the vehicle control system and will stop the vehicle from operation. Pull up on the knob to reconnect the power.
The power cut switch should only be activated in an emergency, such as when the vehicle is not operating as expected or if odors such as a burning scent are coming from the vehicle.
DO NOT use the switch when only parking the vehicle.