Cummins/Onan — Complete System Test
Operation · Transfer switch / generator set
From a Cummins/Onan service manual covering: C13 N6H, C13N6H, C17 N6H, C17N6H, C20 N6, C20N6H, RS13A. Check it applies to your exact model before use.
Applies to: Cummins/Onan C13 N6H, Cummins/Onan C17 N6H, Cummins/Onan C20 N6, Cummins/Onan RS13A
Before you start
- Only authorized and qualified maintenance technicians should carry out this test.
Procedure
- Before starting, check the oil level and make sure there is enough fuel.
- Place the generator set in Standby mode.
- Switch the main utility disconnect from the ON to the OFF position.
- Make sure the generator set starts and, after it stabilizes, the load is transferred from the utility to the generator set.
- Switch the main utility disconnect from the OFF to the ON position.
- Make sure that after approximately 5 minutes the load is transferred back to the utility.
- Make sure that once the transfer switch is connected to utility power, after approximately 5 minutes, the generator set stops.
Specs & values
- Utility re-transfer delay: approximately 5 minutes
- Generator set cool down: approximately 5 minutes
Full service-parts list: Cummins/Onan C20 N6 →
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.