Cummins/Onan — Diluting Battery Electrolyte for Hot Locations
Maintenance
From a Cummins/Onan owner's manual covering: 150UK2XN1A, 150UK5XN1A, 150UK6XN1A. Check it applies to your exact model before use.
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Before you start
- Avoid skin or clothing contact with electrolyte.
- Dispose of electrolyte in a safe manner.
Procedure
- Fully charge the battery.
- With battery still on charge, draw off all electrolyte above the plates in each cell using a hydrometer or filler bulb. Do not pour off. Avoid skin or clothing contact and dispose safely.
- Refill each cell with approved water to recommended level.
- Continue charging for 1 hour at a 4 to 6 ampere rate.
- Test each cell. If specific gravity is still above 1.225, repeat steps 2, 3 and 4 until reading is reduced to 1.225.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- specific gravity 1.225
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.