Cummins/Onan OHV Engine

How to read your Cummins/Onan engine serial & model number →

• No electricity is generated at receptacle — loose connection at AC receptacle or DC terminals
  Cause: AC receptacle and DC terminals have loose connection
  Fix: Secure connection if necessary
• No electricity is generated at receptacle — engine starting attempted with appliances already connected
  Cause: Engine starting was attempted with appliances already connected to generator
  Fix: Turn off switch on the appliance, and disconnect cable from receptacle; Reconnect after generator has been started properly
• No electricity is generated at receptacle — AC circuit breaker not in the "ON" position
  Cause: AC circuit breaker is not in the "ON" position
  Fix: After making sure that the total wattage of the electrical appliance is within permissible limits and there are no defects in the appliance, turn the AC circuit breaker to the "ON" position; If breakers continue to actuate, consult your nearest servicing dealer
• Low power
  Cause: Carbon brushes are excessively worn
  Fix: Check the brush every 500 hours or if generator performance is irregular; If the brush is 5 mm long or less, replace it with a new one
• Engine fails to start — loose spark plug cap
  Cause: Spark plug cap is loose
  Fix: If loose, push spark plug cap back into place
• Engine fails to start — generator connected to an appliance
  Cause: Generator is connected to an appliance
  Fix: If connected, turn off the power switch on the connected appliance and unplug
• Engine fails to start — fuel level low
  Cause: Fuel level is low
  Fix: If empty, refill fuel tank making sure not to overfill
• Engine fails to start — fuel cock closed
  Cause: Fuel cock is closed
  Fix: If closed, open fuel cock
• Engine fails to start — engine switch in OFF
  Cause: Engine switch is in OFF
  Fix: Turn engine switch to ON
• Engine fails to start — contaminated spark plug
  Cause: Spark plug is contaminated
  Fix: Remove spark plug and clean electrode
• Engine fails to start — choke lever not in its proper position
  Cause: Choke lever is not in its proper position
  Fix: Set the choke lever to "CLOSE" position

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan OHV.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.