Cummins/Onan — Checking Electrolyte Level
Maintenance · Starting batteries
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFE, Cummins/Onan DFEJ, Cummins/Onan DFEK, Cummins/Onan QSX15 engine
Before you start
- Do not add water in freezing weather unless the engine will run long enough (two to three hours) to assure thorough mixing of water and electrolyte.
Procedure
- Check the electrolyte level in the batteries at least every 200 hours of operation.
- Fill the battery cells to the bottom of the filler neck.
- If cells are low on water, add distilled water and recharge.
- If one cell is low, check case for leaks.
- Keep the battery case clean and dry.
Specs & values
- Check electrolyte level at least every 200 hours of operation
Full service-parts list: Cummins/Onan DFE →, Cummins/Onan DFEJ →, Cummins/Onan DFEK →
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.