Cummins/Onan — 10-2009

For these Cummins/Onan models: EGMBT, EGMBT (P4500), EGMBU, EGMBU (P5000E), EGMBU (P5000e), P24500 (Spec A), P5000e (Spec A).

Applies to: Cummins Onan Egmbt, Cummins Onan Egmbu

Procedure

1. 4. Starting and Running the Generator Set Ground the generator set to earth ground by connecting a suitable ground wire to the ground lug terminal on the generator set control panel. The other end of the wire must be connected to a suitable earth ground according to local electrical codes. Do not connect grounds from tools or appliances to the Ground Lug terminal. Extension cords for tools or appliances with grounding blades must have grounding blades. WARNING: If the generator neutral supply is not grounded to earth, the user may be left without ground fault protection, which could result in serious personal injury or death. Always make sure the generator neutral supply is grounded to earth before operating the generator set.
2. 4.9 Low Oil Shutdown The generator set automatically stops if it senses low oil level. If the engine stops while running, or starts but then stops, check the oil level and add oil as necessary. See the Maintenance section of this manual.
3. 4.10 Electrical Interference with Communications or Appliances If the generator set causes electrical interference with communications devices, move the generator set and device farther apart or shut down the generator set while the device is operating.
4. 4.11 Exercising the Generator Set Exercise the generator set at least two hours every month if use is infrequent. Run it at approximately 50 percent capacity. A single two-hour exercise period is better than several shorter periods. Exercising a generator set drives off moisture, re-lubricates the engine, replaces stale fuel, and removes oxides from electrical contacts. The result is better starting, more reliable operation, and longer engine life.
5. 4.12 Engine Break-In Proper engine break-in is necessary for top performance.
6. 1. Operate the generator set as it is intended to be operated. However, for the first 1-1/2 hours, if possible, run the generator set at 50 percent capacity, occasionally operating at full power for brief periods. Avoid prolonged low-power operation during break-in.
7. 2. Make sure the engine has oil of the proper viscosity for the ambient temperature (see Engine Oil Recommendations).
8. 3. Check the oil level twice a day or after every 4 hours of operation during the first 20 hours of operation.

Source: manual:914-0508 Onan EGMBT P24500 EGMBU P5000e (spec A) Portable Genset Service manual (10-2009).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.