Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Service Procedure

Cummins/Onan — Service Procedure

For these Cummins/Onan models: 6JB, 7.5JB, J-Series (2-cylinder), J-Series (4-cylinder), JC.

Applies to: Cummins Onan 6Jb, Cummins Onan 7 5Jb

Before you start

  • The diaphragm must be flexed or it will deliver too much fuel pressure.

Procedure

  1. Before installing a new diaphragm, soak it in fuel. In-
  2. Compress the rocker spring and install between the
  3. Assemble the cover to the body with notch marks lined

Source: manual:967-0500 Onan JB JC (spec A-T) Genset Service manual MAGNECITER END (11-1971).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.