Generator Service and Process

Any generator set used for emergency or primary source must have periodic service and maintenance performed. Setting up a planned maintenance schedule, and performing all associated testing will insure generator availability upon demand. Possibilities of generator failure increase when service and maintenance checks are not performed.

 Planned Maintenance

Planned maintenance can be defined as performing service, maintenance, inspections and testing on a generator set on a pre-determined schedule. Each maintenance program should include inspections for the status listed below:

Visual Checks

All planned maintenance charts define checks to be completed at a calendar interval. Coolant, lubricating oil and coolant levels can be at normal levels, but can be contaminated. When performing normal maintenance inspections look for the following:

Operating Inspections

The application the generator is used in defines the inspections that need to be performed while in operation. Each application requires development of a different inspection.
Always consult manufacturer’s guidelines when designing inspections to be performed when the generator is operating. Consider recent repairs and add into inspection criteria.


When an emergency generator is removed from service for a permeate period of time it is placed in the layup status. Some basic steps to place a generator in layup can include: