Cummins/Onan 4MCCK / 605MCCK — Generator Assembly
Repair & overhaul
For the Cummins/Onan 4MCCK / 605MCCK, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 605MCCK, Cummins/Onan MCCK, Cummins/Onan MCCK engine
Before you start
- Do not tighten the armature or rotor through stud before mounting the frame and bearing support, or misalignment may occur.
Procedure
- Clean and inspect all mating surfaces; they should be free of nicks and dirt.
- Coat the mating area between the generator shaft and engine crankshaft with a thin film of lubricating oil, Molycoat or equal.
- Assemble the armature through stud to the engine crankshaft with required torque.
- Check that the key is in the crankshaft.
- Slide the armature over the through stud and onto the crankshaft.
- Install the baffle ring when used.
- Assemble the generator through studs to the adapter with required torque.
- Install the frame and bearing support and tighten frame to required torque.
- Now torque down the armature through-stud nut.
- Tap the bearing support in the horizontal and vertical plane with a lead hammer and recheck the torque.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan 605MCCK →, 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.