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

Cummins/Onan AT U C D ‘400 - 4X / 11 10 C — Service Procedure

For the Cummins/Onan AT U C D ‘400 - 4X / 11 10 C.

Browse Cummins/Onan generators & specs →

Procedure

  1. Open automatic transfer switch cabinet door.
  2. Move the operation selector switch to “STOP” (on
  3. Disconnect the starting batteries.
  4. Remove AC line voltage from the automatic
  5. Remove the twist-lock disconnect plug and con-
  6. Rewire the stepdown transformers T2, T3, T4, and
  7. Rewire battery chargertransformerT1 so the wire
  8. Close the control accessory panel.
  9. Reconnect the twist-lock disconnect plug.
  10. Restore AC line voltage to the automatic transfer

Source: manual:962-0500 Onan AT (spec A-C) Transfer Switch Service Manual (08-1979).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.