Cummins/Onan — Brush Inspection (J-Series)
Maintenance · Brushes
From a Cummins/Onan service manual covering: 02SX1N1A, 04SX1N, 04SX1N1A, 04SX1N1B, 04SX1N2B, 04SX1N3B, 04SX1N4B, 06SX1N, 06SX1N1A, 06SX1N1B, 06SX1N2B, 06SX1N3B…. Check it applies to your exact model before use.
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Before you start
- Use only Onan parts when replacing brushes.
Procedure
- Remove exciter cover at rear of generator to examine brushes, brush springs, and slip rings.
- Exciter mounts on hinged plate. Remove screw from right side of plate and swing assembly outward.
- To remove brush holders, unscrew four machine screws on endbell near ballbearing (Figure 4-9).
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan service 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.