Cummins/Onan — Water Pump #131-0152 Disassembly

Repair & overhaul

From a Cummins/Onan service manual covering: 12.0MDJC, 15.0MDJF, 3.0MDJA, 6.0MDJB, 7.5MDJE. Check it applies to your exact model before use.

Applies to: Cummins/Onan 3.0MDJA, Cummins/Onan MDJA, Cummins/Onan MDJC, Cummins/Onan MDJE, Cummins/Onan MDJF, Cummins/Onan MDJA engine, Cummins/Onan MDJB engine, Cummins/Onan MDJE engine, Cummins/Onan MDJC engine, Cummins/Onan MDJF engine

Procedure

1. Remove pump end plate screws, end plate, and gasket.
2. Pull out neoprene impeller with pliers.
3. Disconnect hoses and remove cap screws holding pump.
4. Loosen set screw and tap to free cam.
5. Lift out cam and wear plate.
6. Remove retaining ring and slide seat assembly off shaft.
7. Pry bellows assembly out through drain slots.
8. Drive shaft and bearing assembly out.

Full service-parts list: Cummins/Onan 3.0MDJA →, Cummins/Onan MDJA →, Cummins/Onan MDJC →, Cummins/Onan MDJE →, Cummins/Onan MDJF →

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.

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