RCO Training Mechanical Practice Test 2026 - Free Mechanical Test Practice Questions and Study Guide

When an overspeed trip occurs, the protection device must be reset with a deliberate mechanical action. You pull the reset mechanism toward you until it clicks and hold it for about three seconds to ensure the latch re-engages. After that, you can restart the engine. This specific pull-and-hold sequence re-sets the device properly, confirming it’s ready to protect again. Other actions don’t actually reset the device: pushing a reset button isn’t the correct method, pulling away from you won’t reset the latch, and simply turning the ignition doesn’t clear the trip. Restart only after the reset is completed.