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Home›Repair guides›Cummins/Onan›Battery Electrolyte Reduction for High Ambient Temperature

Cummins/Onan 305CCK / 5CCK — Battery Electrolyte Reduction for High Ambient Temperature

Maintenance

For the Cummins/Onan 305CCK / 5CCK, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan 5CCK

Before you start

  • Avoid skin or clothing contact with electrolyte. Do not bring open flame or burning cigarette near charging batteries.

Procedure

  1. Fully charge battery.
  2. While battery is on charge, siphon off electrolyte above plates in each cell.
  3. Fill each cell with pure distilled water.
  4. Recharge battery for one hour at 4 to 6 ampere rate.
  5. Test each cell with hydrometer; repeat steps if specific gravity is above 1.225.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Target full-charge specific gravity not over 1.225.

Full service-parts list: Cummins/Onan 5CCK →

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.

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