Cummins/Onan HDZAA — Service Procedure

For the Cummins/Onan HDZAA.

Applies to: Cummins Onan Hdzaa

Procedure

1. Check that the engine stop lever is in its vertical
2. Reduce Loads: Disconnect AC output leads
3. Check Fuel Flow: Verify fuel flow from lift pump
4. Check air flow (intake,exhaust) for restrictions:
5. Verify that the stop solenoid is operating cor-
6. Check the PMA winding connections at the in-
7. The engine “wet-stacked” when run under no
8. The injector is partially blocked. Check the
9. The injector popping pressure is too Low.
10. The engine is worn. Refer to Engine Workshop

Source: manual:983-0502 Onan HDZAA (spec A-B) Diesel Genset Service manual (06-2010).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.