If a coil has been replaced in a type H or L hydraulic recloser, what must be done?

When a coil has been replaced in a type H or L hydraulic recloser, it is essential to pump oil into the cylinder. This step is crucial because the hydraulic mechanism relies on the proper oil level and pressure to function correctly. When replacing a coil, the integrity of the hydraulic system may be compromised, leading to potential issues if the oil isn't properly replenished.

The oil serves as a medium to transmit force in the hydraulic system, and without the right amount of oil, the recloser may not operate as intended. Ensuring that the cylinder is adequately filled with oil contributes to the reliability and performance of the device, allowing it to respond accurately to fault conditions.

After filling the cylinder, further operational checks can be conducted, but the initial step of pumping oil is fundamental to ensure the system is ready for proper function.