Why your Screw Jack overheats and how to prevent it

1. Overheating of Screw Jacks: Identify causes and prevent it

Even with precise manufacturing and careful design, electromechanical lifting systems can experience thermal issues during operation. A particularly critical case is overheating of the gearbox. This not only reduces service life but can also lead to total failure. This article explains the typical causes and shows how to effectively prevent overheating.

2. How to detect overheating

A lifting drive should not exceed a surface temperature of 80 °C (176 °F). While this temperature may feel hot to the touch, it does not automatically indicate overheating.

All screw jacks are equipped with a temperature indicator that irreversibly changes color when the thermal limit is exceeded. This discoloration provides a clear warning that the maximum temperature has been reached.

3. Causes of overheating

3.1 Exceeding the duty cycle

Operating a lifting element beyond its allowable duty cycle prevents adequate cooling. Heat accumulates, especially when it is slowly dissipated to the environment. This “thermal creep” creates hotspots that can build up quickly during continuous operation.

3.2 Overload

Loads higher than specified increase friction and thermal stress. Mechanical stiffness caused by misalignment or system binding can also overload the gearbox thermally.

3.3 Insufficient lubrication

Poor lubrication significantly worsens sliding behavior, generating additional friction and heat. Increased squeaking noises and higher motor current are common warning signs.

4. Measures to prevent overheating

4.1 Check cycle times and improve efficiency

Allow longer idle periods for the system to cool. If operational constraints don't permit this, switching to more efficient components can help. For example, replacing a trapezoidal lead screw with a ball screw can improve efficiency by over 25%, significantly reducing heat generation.

4.2 Check load and installation

Ensure mechanical tolerances are within specifications. Even small misalignments increase system load considerably – often unnoticed.

4.3 Regularly monitor lubrication

Simple re-lubrication can immediately resolve thermal issues. Pay attention to unusual noises and inspect lubrication points regularly, even during operation.

5. Conclusion: Avoid thermal build-up – Extend service life

Overheating is usually the result of several small irregularities: excessive load, insufficient pauses, or inadequate lubrication. If the 80 °C (176 °F) temperature limit is consistently exceeded, both performance and service life of the drive suffer. By ensuring proper lubrication, correct cycle times, and careful assembly, thermal build-up can be prevented – protecting your gearbox from long-term damage.