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Cummins/Onan — These suggestions are not intended to replace or

For these Cummins/Onan models: G&855, G12 GTAi2 Ga55 GTA855-A GTA855-B GTAI9 GTA28.

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Procedure

  1. Read and Follow the manufacturer’s manu-
  2. Test the condition of the batteries before
  3. Check the condition of the filter material on
  4. Remove the cell saver cap, check the Oxygen
  5. Connect the temperature reducing tubing to

Source: manual:Cummins Gas GTA12-19-28-855 Manual 2001.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.