Elevator Mechanic Practice Exam 2026 - Free Elevator Mechanic Practice Questions and Study Guide

A hydro that can run with no load but not with a full load would indicate that there may be a blockage in the control valve. The other options (B, C, and D) would cause the hydro to not run at all, rather than just not being able to handle a full load. If the oil level is too low, it would not be able to maintain pressure and the hydro would not be able to run at all. If the pump is undersized, it would not be able to generate enough pressure to run the hydro, and if the relief valve is set too low, it would constantly release pressure and the hydro would not be able to build up enough pressure to run. Only a blockage in the control valve would allow the hydro to run with no load, but not with a full load.