Cummins/Onan — Battery Check
Maintenance
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DGEA, Cummins/Onan DGFA, Cummins/Onan DGFB, Cummins/Onan 6CT8.3G engine, Cummins/Onan 6CTA8.3G engine
Before you start
- Ignition of explosive battery gases can cause severe personal injury. Do not smoke. Wear goggles and protective rubber gloves and apron when servicing batteries.
Procedure
- Check condition of starting batteries at interval specified in Maintenance Table.
- See that connections are clean and tight.
- Apply light coating of non-conductive grease to retard corrosion at terminals.
- Keep electrolyte at proper level above plates by adding distilled water.
- Check specific gravity using hydrometer and recharge if below 1.260.
Tools required
- hydrometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- specific gravity 1.260 at 77°F (25°C)
Full service-parts list: Cummins/Onan DGEA →, Cummins/Onan DGFA →, Cummins/Onan DGFB →
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.