Cummins/Onan — Brush Block and Slip Rings
Maintenance · Brush Holder Assembly
From a Cummins/Onan service manual covering: P4500, P5000E, P5000e. Check it applies to your exact model before use.
Applies to: Cummins/Onan P4500
Before you start
- Connect the blue wire lead to the positive (+) side of the brush holder.
Procedure
- Remove the end cap and the brush block mounting screw, then remove the brush block.
- Check the brush for length, wear, or other defect; replace if less than 5 mm (0.20 in).
- Visually inspect the slip rings for dust, rust, or damage; wipe with a clean lint-free cloth if necessary.
- If rusted or damaged, remove the rotor and rub with fine emery cloth.
Specs & values
- Replace brush if length is less than 5 mm (0.20 in)
Full service-parts list: Cummins/Onan P4500 →
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.