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Home›Repair guides›AC SCHEMATIC - ELECTRONIC REG

Cummins/Onan — AC SCHEMATIC - ELECTRONIC REG

For these Cummins/Onan models: MDL3, MDL4, MDL6.

Applies to: Cummins Onan Mdl3, Cummins Onan Mdl4, Cummins Onan Mdl6

Procedure

  1. Disconnect the battery cables to prevent accidental starting of the generator set while servicing. Accidental starting of the set can cause severe personal in- jury or death. Disconnect the battery cables when repairs are made to the engine, controls, or generator.
  2. Remove cover from the control box and disconnect all stator leads. If control has load circuit breakers, disconnect leadsat breaker. If lead markings do not clearly identify reconnection, mark leads with tape.
  3. Remove end bell cover and remove field leads F1 and F2. If unit has an overspeed switch and battery charging components, disconnect leads at these components.
  4. Remove load wiresand flexible conduit from control box.
  5. Remove capscrews securing the control box mounting saddle to the stator. The control box and saddle is removed as an assembly.
  6. Pull stator leads through opening in bottom of con- trol box and saddle as they are lifted free from stator. Do not disconnect any engine DC control wires in the control box.
  7. Set control box and saddle on top of engine.
  8. Remove overspeed switch/bracket assembly from

Source: manual:934-0500 Onan MDL3 MDL4 MDL6 Marine Genset Service manual (08-1991).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.