Cummins/Onan 4MCCK / 605MCCK — Centrifugal Pump Repair
Repair & overhaul · Centrifugal fresh water pump
For the Cummins/Onan 4MCCK / 605MCCK, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 605MCCK, Cummins/Onan MCCK, Cummins/Onan MCCK engine
Procedure
- Remove the water inlet from the pump and the six screws holding the end cover.
- Unscrew the impeller from the shaft (counterclockwise when facing the impeller).
- Remove the pump body by unscrewing the single cap screw that clamps the body to the pedestal.
- Remove the retaining ring and drive the bearing assembly from the pedestal.
- Drive the water seal out of the pump body and replace worn components.
- Check the wear plate pressed into the impeller and replace it if necessary.
- After assembly, rotate the pump shaft to see that the impeller does not rub on the pump body.
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.