Cummins/Onan 12.5 RDJC / 15.0 RDJC — Starting at Control Panel
Operation
For the Cummins/Onan 12.5 RDJC / 15.0 RDJC, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan 12.5 RDJC, Cummins/Onan 15.0 RDJC, Cummins/Onan RDJC
Before you start
- Preheating the engine longer than one minute before cranking can destroy the manifold heater and glow plugs
- Overvoltage will destroy the glow plugs and air heater in 2 to 3 seconds
Procedure
- Press the Preheat switch and hold for one minute if outdoor temperature is below 55°F (13°C).
- Hold Preheat for thirty seconds if outdoor temperature is above 55°F (13°C).
- Release the Preheat switch and move the Run/Stop/Remote switch to the RUN position.
- Starter cranks and the engine should start; the starter disconnects at 450 to 570 r/min.
- If the engine does not start, the set indicates an overcrank fault.
- To clear an overcrank fault, place the Run/Stop/Remote switch in the STOP position and momentarily depress the Reset switch.
- Wait two minutes for the starter motor to cool, then repeat the starting procedure.
Specs & values
- Starter disconnect speed: 450 to 570 r/min
- Standard overcrank control cranks continuously up to 75 seconds
- Cycle cranking option cranks 15 seconds per cycle until 3 cycles are completed
Full service-parts list: Cummins/Onan RDJC →
Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.