Cummins/Onan — Starting
Operation · Generator set
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan YD series, Cummins/Onan J block (Series JB/JC) engine
Before you start
- Pressure cooled engines can quickly overheat and be damaged if run without the front air shroud/access cover in place.
Procedure
- Check the fuel and oil levels.
- Make sure all the air shrouds and service access covers are in place.
- Press the START/STOP switch to START until the engine starts; the starter is disengaged automatically by the start disconnect switch.
- Do not crank for more than 30 seconds at a time; allow 60 seconds between cranks.
- A new set may not start right away if spark plug electrodes are coated by rust inhibiting oil; remove spark plugs and clean the oil off.
- The oil pressure gauge should indicate at least 20 psi.
- Connect the load and follow the break-in procedure for initial start-up.
Specs & values
- Oil pressure gauge at least 20 psi
Full service-parts list: Cummins/Onan YD series →
Source: Cummins/Onan owner'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.