Cummins/Onan — Generator Disassembly (Power Drawer)
Repair & overhaul · Power Drawer generator
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MCCK
Before you start
- The generator will overheat if reassembled incorrectly.
- Brushes will be damaged during disassembly if not held off the slip rings.
Procedure
- Remove the unit from its slide rails.
- Remove all accessories attached to the generator.
- Tag and remove all leads.
- Loosen and lift out both brush rigs.
- Remove four generator through-stud nuts.
- Lift or pull the end bell from the frame assembly; tap edges with a plastic hammer.
- Remove the frame (field) assembly, being careful not to let it rest or drag on the armature.
- Insert a square 3/8 inch drive into the 12-point armature holddown nut to remove it.
- Loosen the armature by striking a sharp blow on the armature shaft; use a brass rod if needed.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Four seals used between frame (field) assembly and engine-to-generator adapter must be used to reassemble.
Full service-parts list: Cummins/Onan MCCK →
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.