Maintenance & Repair Procedures Flashcards

A panic bar's latch stays retracted after every use and the door never secures. What should the locksmith check first?

Answer: Whether the device has been left dogged

Mechanical dogging holds the latch retracted on purpose, and it is often left engaged by mistake.

Which statement about fire exit hardware on a labeled fire door is correct?

Answer: It must not have mechanical dogging that holds the latch retracted

Fire-rated doors must positively latch, so fire exit hardware cannot include mechanical dogging.

Under NFPA 80, how often must swinging fire door assemblies be inspected and tested?

Answer: At least annually

NFPA 80 requires fire door assemblies to be inspected and tested at least once a year.

What holds a mortise cylinder in place in a mortise lock body?

Answer: A cylinder set screw in the lock body

Mortise cylinders thread into the lock body and are held from turning or backing out by a set screw reached from the lock face.

When removing a plug from a pin tumbler cylinder to rekey it, which tool keeps the top pins and springs in the shell?

Answer: Plug follower

A plug follower pushes the plug out and takes its place, keeping the top pins and springs from popping out of the shell.

The levers on a heavy-duty cylindrical lock now droop and don't return to horizontal. What is the most likely cause?

Answer: Broken or weak lever return spring

Lever sag usually means the return spring that holds the lever level has broken or worn out.

In a master-keyed pin tumbler chamber, which pin sits between the bottom pin and the top pin?

Answer: Master pin

A master pin (build-up wafer) creates a second shear line so both the change key and master key can operate the cylinder.