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Cummins/Onan — 5. Preparing for Service

For these Cummins/Onan models: HGJAA (Spec A-E), HGJAB (Spec A-E), HGJAC (Spec A-C), HGJAD (Spec A-E), HGJAE (Spec A-E), HGJAF (Spec A-C).

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Before you start

  • WARNING

Procedure

  1. Preparing for Service
  2. Disconnect all battery cables, negative (-) cable first, at the battery terminals.
  3. Disconnect the negative (-) and positive (+) battery cables at the generator set.
  4. Disconnect the wiring connectors for remote control and remote fuel pump (fuel injection models).
  5. Disconnect the generator AC output wires and conduit from the junction box on the vehicle.
  6. Disconnect the exhaust tail pipe.
  7. Gasoline-fueled generator sets:

Source: manual:HGJAA, HGJAB, HGJAC, HGJAD, HGJAE, HGJAF Service Manual.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.