Cummins/Onan — Brush Assembly Removal
Repair & overhaul · DC Alternator
From a Cummins/Onan operator's manual covering: 250DFT-57R8, 300DFT-4R8, 300DFT-4XR8, 300DFT-5DR8, 300DFT-6DR8, 300DFT-7XR8, 300DFT-9XR8. Check it applies to your exact model before use.
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Procedure
- Remove three No. 10-24 screws fastening voltage regulator to DC alternator. Remove regulator to access phenolic cover, disconnecting leads as required.
- Remove two No. 8-32 screws on phenolic cover and lift out cover and gasket.
- Pull brush assembly straight up and lift out.
- For reassembly, reverse procedure.
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- For remote mounted voltage regulators use only steps 2 and 3
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.