Cummins/Onan — Yearly Preventative Maintenance
Maintenance · GenSet and Transfer Switch System
From a Cummins/Onan service manual — check it applies to your exact model before use.
Browse Cummins/Onan generators & specs →
Before you start
- Both utility and GenSet power must be disconnected and the GenSet disabled while maintenance is performed.
Procedure
- De-energize the power system and disable the operational capability of the GenSet.
- Dust and vacuum all controls, meters, circuit breakers and bus compartments.
- Wash cabinet surfaces and meter faces with a damp (mild detergent and water) sponge.
- Visually inspect system buswork and supports for carbon tracking, cracks, corrosion, or deterioration.
- Check buswork hardware, control wiring, power cables and cabinets for loose connections or missing hardware.
- Tighten all system buswork, control wiring, power cable, and cabinet hardware.
- Service or replace the GenSet batteries and verify battery charger operation.
- Run a Periodic Running Test and operate all controls while observing meters and indicator lights.
- Check the operational capability of all protective circuits and devices while observing meters and lights.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.