Cummins/Onan — Returning Genset to Service
Maintenance
From a Cummins/Onan operator's manual covering: 5.5 HGJAA, 5.5 HGJAB, 5.5 HGJAC, 6.5 HGJAA, 6.5 HGJAB, 6.5 HGJAC, 7.0 HGJAA, 7.0 HGJAB, 7.0 HGJAC. Check it applies to your exact model before use.
Applies to: Cummins/Onan HGJAA, Cummins/Onan HGJAB, Cummins/Onan HGJAC
Procedure
- Check the oil tag and change oil if viscosity is not appropriate for expected temperatures.
- Reconnect the starting battery (negative cable last).
- Remove the plug from the exhaust tailpipe.
- Change the air filter element if it is dirty.
- Open the fuel supply valve (if so equipped).
- Inspect the genset.
- Gasoline models: prime the fuel system by holding the control switch at STOP/PRIME for 30 seconds.
- High pressure LPG models: make sure the LPG oil drain valve is closed.
- Start the genset (some smoke/rough running may occur until fogger oil burns off).
- Push the genset line circuit breaker ON when ready to power appliances.
Full service-parts list: Cummins/Onan HGJAA →, Cummins/Onan HGJAB →, Cummins/Onan HGJAC →
Source: Cummins/Onan operator's 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.