When a JLG scissor lift displays a flashing warning light, it typically indicates an issue that requires immediate attention. This guide will help operators understand what the flashing lights mean and how to troubleshoot the problem effectively.

Understanding Warning Lights

The warning lights on a JLG scissor lift serve as indicators for various operational statuses and potential faults. A flashing warning light can signify:

  • Creep Speed Activated: If the creep light is flashing, it may indicate that the control system has automatically selected creep speed due to the boom being near the edge of its operating envelope or another safety condition being triggered.
  • Boom Control System Warning: A flashing light may also indicate that a movement is not allowed due to safety restrictions. This can happen if the platform is overloaded or if the boom has reached its operational limits.
  • Diagnostic Trouble Codes (DTC): The flashing pattern of the warning light can correspond to specific error codes, which can help diagnose issues with components like the battery, joystick, or elevation sensors.

Common Causes of Flashing Warning Lights

1. Overload Conditions: If the platform capacity exceeds its limit, the warning light may flash to prevent unsafe operations.

2. Sensor Malfunctions: Issues with sensors, such as the elevation angle sensor or platform load sense, can trigger warning lights.

3. Electrical Issues: Problems with wiring or connections, especially related to the battery or control modules, can cause warning lights to flash.

4. Safety Switches: If safety switches are engaged improperly, such as during power-up when controls are activated, this may result in a flashing light.

Troubleshooting Steps

To address a flashing warning light on a JLG scissor lift:

  • Check Load Capacity: Ensure that the load on the platform does not exceed its rated capacity. Remove excess weight if necessary.
  • Inspect Sensors and Wiring: Verify that all sensors are securely mounted and undamaged. Check wiring for any signs of wear or disconnection.
  • Review Control Settings: Ensure that all control settings are correct and that no safety switches are inadvertently engaged.
  • Consult Error Codes: Use a diagnostic tool or machine analyzer to read any stored error codes that may provide insight into specific issues.
  • Power Cycle the Machine: Sometimes, simply turning off and restarting the lift can reset minor faults.

Important Safety Reminders

Always prioritize safety when operating scissor lifts. Before troubleshooting:

  • Ensure that personnel are clear from the platform.
  • Follow all manufacturer guidelines outlined in the operation manual.
  • Conduct regular maintenance checks to prevent issues from arising.

By understanding the implications of a flashing warning light and following these troubleshooting steps, operators can maintain safe and efficient operation of JLG scissor lifts.