Which sequence of steps should be performed before cleaning TruDefender?

• A. Power on unit, seal access door, disassemble crusher
• B. Power off unit, disassemble crusher, seal access door
• C. Seal access door, power off unit, disassemble crusher
• D. Power off unit, seal access door, disassemble crusher

Answer: (D)

Safe maintenance starts with complete energy isolation before touching the equipment. For cleaning the TruDefender, the correct sequence is to first power the unit off to stop all electrical energy and prevent any accidental startup. Next, seal the access door to secure the interior and prevent re-entry or re-energization during maintenance. Only after the unit is de-energized and the access is secured should you disassemble the crusher to reach the parts that need cleaning. This order protects you from electrical hazards, moving parts, and unexpected device reactivation.

Putting any step after starting the work with power on is unsafe, and attempting to disassemble the crusher before isolating power or securing access would expose you to energy sources and hazards. Sealing the door before powering off wouldn’t guarantee isolation, which is why that sequence isn’t correct.