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Cummins/Onan OT III — System Visual Inspection During Operation

For the Cummins/Onan OT III.

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Procedure

  1. Operate the Utility Main Disconnect Switch to disconnect utility power
  2. While the system is running, check for visual indications of leaks, loose connections, or abnormal noise
  3. Inspect all connections and fittings for proper seating and security

Source: manual:900-0277 Onan 300 DFCC and OT III System Manual (4-1994).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.