Generac — Break-in Procedure

Operation · Generator

From a Generac owner's manual — check it applies to your exact model before use.

Applies to: Generac GT-990 engine, Generac GH-410 engine

Procedure

1. Set the Auto/Off/Manual switch to AUTO.
2. Turn OFF the utility power supply to the transfer switch.
3. Unit starts and transfer switch transfers to standby.
4. Load to approximately 25% rated load and run for one hour.
5. Run one hour at 50% rated load.
6. Run one hour at 75% rated load.
7. Run one hour at 100% rated load.
8. Turn ON utility power; unit runs one minute then shuts down.
9. Allow the unit to cool.
10. Set switch to OFF; remove 5A and 15A fuses; disconnect battery cables.
11. Drain the oil and replace the oil filter; refill with synthetic oil.
12. Reconnect battery cables and insert the 5A and 15A fuses.

Source: Generac owner'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.

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