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Cummins/Onan — Procedure

For these Cummins/Onan models: 15.0 HA, 7.5 HA.

Applies to: Cummins Onan 15 0 Ha, Cummins Onan 7 5 Ha

Procedure

  1. 3. Move Auto-Manual switch to Manual position. Start generator set at unit controls by placing the switch to Start position. Controller contactor should close and supply power to load. Place HA control Auto-Manual switch to Auto position. If generator set stops, review the following: A. Remove start-run relay K9 and perform a continuity check between pins 1 and 8 to check resistance of holding coil. Reading should be 500 ohms +10%. Replace relay if defective. B. Perform continuity check of current transformer lead connections at A1/J1 (pins 7,8 and 9). C. Replace load sensor board A1. Generator set repeatedly over-cranks and trips cranking limiter K3. Check fuel level and standpipe depth in tank. GENERATOR SET WILL NOT STOP WHEN LOAD IS REMOVED
  2. 1.
  3. 2.
  4. 3.

Source: manual:907-0501 Onan HA Auto Demand Control Service Manual Spec D (07-1986).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.