Cummins/Onan — Battery specific gravity reduction for high temperature
Maintenance
From a Cummins/Onan owner's manual covering: 10CW-150R, LOCW-150 R/, LOCW-3R/12 F. Check it applies to your exact model before use.
Applies to: Cummins/Onan 10CW-150R, Cummins/Onan Spec A, Cummins/Onan Spec B, Cummins/Onan Spec C, Cummins/Onan Spec D, Cummins/Onan Spec E, Cummins/Onan Spec F, Cummins/Onan Spec G
Before you start
- Avoid skin or clothing contact with electrolyte; gas released during charging is inflammable.
Procedure
- Fully charge battery; keep open flame away.
- Siphon off electrolyte above plates in each cell.
- Fill each cell with pure distilled water to recommended level.
- Recharge batteries for one hour at 4 to 6 ampere rate.
- Test each cell with hydrometer; repeat steps until specific gravity not over 1.225.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 1.225 maximum specific gravity
- 4 to 6 ampere recharge rate
Full service-parts list: Cummins/Onan 10CW-150R →, Cummins/Onan Spec A →, Cummins/Onan Spec B →, Cummins/Onan Spec C →, Cummins/Onan Spec D →, Cummins/Onan Spec E →, Cummins/Onan Spec F →, Cummins/Onan Spec G →
Source: Cummins/Onan 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.