Elevator Mechanic Practice Exam

On an ANNUAL static load test, the car drifts down 15" in 10 minutes. There is no visible oil in the pit, where is the leak coming from?

1. Underground. Annual static test required for unexposed cylinders

2. Above ground piping

3. The hoistway door seals

4. Machine room hydraulic reservoir

The correct answer is: Underground. Annual static test required for unexposed cylinders

In the context of an annual static load test where the elevator car drifts down over time, this behavior typically indicates a leak in the hydraulic system. When the drift is significant, such as 15 inches over 10 minutes, the leak is likely located in a part of the system that is not easily visible, which aligns with the answer regarding underground cylinders. An underground leak in the hydraulic cylinder can lead to a loss of fluid without any clear indications in the pit, as the fluid would be below ground level. This possibility is further strengthened by the fact that during these tests, the pressure and integrity of the entire system are being evaluated, and an underground leak would directly impact the ability of the hydraulic system to maintain the elevator at the intended level. Other options, such as leaks from above ground piping, hoistway door seals, or the machine room's hydraulic reservoir, would likely manifest signs of fluid loss or visible oil in accessible areas, making them less likely culprits in this scenario.