Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Cummins/Onan›Replace water pump impeller

Cummins/Onan — Replace water pump impeller

Repair & overhaul

From a Cummins/Onan service manual covering: 10MJC, 15MJC, 3MJA, 4MJA, 5MJB, 705MJB. Check it applies to your exact model before use.

Browse Cummins/Onan generators & specs →

Procedure

  1. Loosen end plate screws and remove end plate.
  2. Pull impeller and shaft out with pliers.
  3. Remove pump from engine if needed.
  4. Install new impeller and shaft assembly.
  5. Install gasket and end cover with screws.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

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.

More Cummins/Onan repair guides →