Cummins/Onan — Generator Brush Replacement (Begin Spec R)
Maintenance · Generator brushes
From a Cummins/Onan operator's manual covering: 4.0CCK, 4.0CCK-3CR, 5.0 CCK, 5.0CCK, 5.0CCK-3CR, 5.0CCK-3R. Check it applies to your exact model before use.
Applies to: Cummins/Onan 4.0CCK, Cummins/Onan CCK engine
Before you start
- Never substitute a brush which may appear to be the same, for it may have different characteristics.
Procedure
- Install new brushes when old ones are worn to the dimensions shown in Figure 21.
- Remove the end bell band to expose the brush holders.
- Remove the three screws holding each brush holder in place.
- Remove old brushes and clean holders so new brushes move easily.
- Install new brushes in the same manner as the old ones; always use correct brush listed in Parts Catalog.
- If brush sparking occurs after replacing, run set under light load until brushes wear to a good seat.
Specs & values
- New brush 5/8 in; wear 13/16 in; replace 1 in
Full service-parts list: Cummins/Onan 4.0CCK →
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.