Safe Lock Servicing
Safe lock servicing is a generic term and covers a multitude of activities. Last century safe lock servicing used to specifically refer to stripping down a spin combination lock and then cleaning and lubricating all the required parts. Few people understand that spin combination safe locks need regular servicing. There are around 15 moving parts in a standard 3 number combination lock. many of the parts are brass and over time the parts cease to move freely. The result is a safe lockout which can be a VERY expensive exercise.
Sargent & Greenleaf in their safe service manual recommend the mechanical safe locks be serviced a minimum of every 5 years, more if the lock is being used frequently. The Banking Industry has a very strict regime for servicing their safe locks. They understand the pain and cost when a safe lock plays up and you have customers screaming for their cash.