When installing a one piece jack assembly, what must be positioned before the jack is completely lowered?

In the context of installing a one piece jack assembly, positioning the pit channels before the jack is completely lowered is crucial for ensuring that the jack operates correctly and safely. Pit channels serve as guides for the jack and help maintain alignment during operation, which is essential for the stability and safety of the lift.

By ensuring that the pit channels are correctly positioned, you facilitate smooth and precise movement of the jack, minimizing the risk of misalignment or malfunction. Proper installation of these channels is fundamental to the overall integrity of the lift system, as improper alignment can lead to uneven lifting or mechanical stress on the components.

While pipe supports, safety devices, and power connections are all important elements in the installation of a jack assembly, their positioning is typically addressed after the initial alignment and securing of the jack itself. Therefore, the correct answer highlights the significance of properly positioning the pit channels as the first step to ensure a safe and effective installation of the jack assembly.