Maintenance & Repair Procedures Flashcards

What is the proper procedure for servicing a cylinder gummed up with old oil and dirt?

Answer: Disassemble, clean the parts with solvent, dry them, and apply a dry lubricant

Old residue has to be removed completely before relubricating, or the binding will come back.

During a power outage, how does a fail-secure electric strike behave?

Answer: It stays locked from the outside

Fail-secure strikes need power to unlock, so they stay locked when power is lost, while free egress from inside is kept by the mechanical hardware.

A magnetic lock's holding force has dropped noticeably. What is a common maintenance cause?

Answer: A dirty or misaligned armature plate

Dirt, rust, or misalignment between the armature and magnet faces reduces surface contact and holding force.

Which door closer mounting places the arm parallel to the door face on the push side?

Answer: Parallel arm mount

Parallel arm mounting puts the closer on the push side with the arm folded along the door, which is common on outswinging and high-abuse openings.

On an outswinging door with exposed hinge pins, what is a recommended security repair?

Answer: Install non-removable pin (NRP) hinges or security studs

NRP hinges or hinge studs stop an intruder from pulling the pins and lifting the door off its hinges.

The key turns the plug freely, but the deadbolt doesn't move. What is the most likely cause?

Answer: Broken or disengaged tailpiece or cam

If the plug turns but the bolt doesn't, the link between plug and bolt, the tailpiece or cam, has failed or come loose.

What is the recommended way to free a padlock frozen by ice?

Answer: Apply a commercial lock de-icer

Lock de-icer melts the ice without leaving water behind that would refreeze.