Maintenance carried out prior to unit or system failure.

All cooling systems will require periodic maintenance to assure that proper freeze/boil protection is in effect and that adequate inhibitiors are present to provide corrosino protection. Thus routine or preventative maintenance will include a freeze point check using refractometer with freeze point adjustment if required. A check of coolant inhibition will also be included using the appropriate coolant test methods - typically but not always involving test strip.

Regular and systematic inspection, cleaning, and replacement of worn parts, materials, and systems. Preventive maintenance helps to prevent parts, material, and systems failure by ensuring that parts, materials and systems are in good working order.

An engineers attendance to inspect a system.

Inspections, tests, adjustments, cleaning and similar activities carried out on elevator and escalator equipment with the intention of preventing malfunctions from occurring during operation. It is designed to keep equipment in proper operating order and is done on a scheduled basis. It is also referred to as scheduled maintenance.

A systematic and scheduled inspection and service of a vehicle to ensure proper maintenance to provide a standard for satisfactory and sound operational conditions.

a series of routines, procedures and steps that are taken in order to try to identify and resolve potential problems before they happen. Preventative maintenance is accomplished by a synergy of tasks including monitoring software and hardware for threshold warnings and constantly examining computer log files for potential problems as well as many other things in order to insure longevity of the server as well as it's integrity