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Cummins/Onan — Water Pump Disassembly

For these Cummins/Onan models: J Series, J-Series, JC - 3CR / 96 T, MAJ, MCCK, MDJA, MDJB, MDJC, MDJE, MDJF, N/A.

Applies to: Cummins Onan J Series, Cummins Onan Maj, Cummins Onan Mdja, Cummins Onan Mdje, Cummins Onan Mdjf

Procedure

  1. Remove water inlet from pump and remove six screws holding end cover to pump.
  2. Unscrew impeller from shaft counterclockwise when facing impeller.
  3. Remove pump body by unscrewing single capscrew that clamps pump body to pedestal.

Source: manual:922-0500 PM200B Onan Master Service Manual (01-1978).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.