Cummins/Onan — Brush Contact - Cleaning Commutator and Slip Rings
Maintenance
From a Cummins/Onan owner's manual covering: 1.5UF-232S, 10.0UF-150S, 12.0UF-3S, 12.0UF-4S, 15.0UB-150S, 15.0UF-3S/104, 2.0UF-125S, 2.0UF-232S/32, 2.0UG-1S/135, 2.5UF-1S, 2.SUD-IS, 2.SUD-IS/ID…. Check it applies to your exact model before use.
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Before you start
- Brush dust may cause a short circuit if not removed.
Procedure
- Remove the end bell cover to reach brushes, commutator and slip rings.
- Hold #00 sandpaper flat against the commutator or slip ring while the generator operates.
- Use a flat wooden stick with light pressure.
- Never use emery or carborundum cloth or paper.
- Wipe or blow out accumulations of brush dust.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.