5. OPERATE & MAINTAIN

Once your fleet is operational, your local Cummins Sales and Service team is available to support your parts, service, and warranty requirements. Use this link to find your local distributor, or contact us and we’ll be happy to connect you with a Cummins representative.

The recommeneded procedures below will optimize the operations and maintenance of your natural gas fleet:

  • Ensure your fleet is following daily operating procedures, and that recommended engine maintenance schedules are understood.
  • Complete scheduled maintenance per recommended intervals.  This includes daily maintenance and inspection of your vehicle.
  • Ensure your drivers and service maintenance team are aware of the importance of performing required inspections and maintenance.  Visit the engine model section of CWI’s website for details.
  • For long term success, it’s especially important to follow maintenance intervals for engine oil, ignition, and overhead adjustments.  See the Payback Calculator for input to scheduled maintenance intervals.
  • Confirm that established natural gas processes for service, fuel system, and fuel stations are being completed.
  • Ensure fuel system maintenance requirements are performed. Fuel system operation manuals include specific maintenance requirements (e.g. high pressure filters, tank inspections etc.) See the Fuel System Information link for more details.
  • Ensure CNG fast-fill settled pressure is meeting range requirements. Fast-fill stations operate at higher pressures and the amount of gas flowing through the filling lines creates some heat.  Some stations will fill to higher pressure so that when gas cools to ambient temperature, the tank pressure will be near 3600 psi.
  • Monitor fleet fuel consumption. Tracking and reporting fuel economy is often a requirement of fleet managers.  The design parameters of the ISL G and ISX12 G engines are for fuel consumption to be within 15% (+ or – 5% depending on duty cycle) of the diesel parent engine. Fuel economy will improve after the engine, transmission, and tire break-in period. We recommend running 50,000 miles (80,467 km) before measuring fuel economy.
  • Review each vehicle’s performance, RPM at cruise, and idle time.  Confirm duty cycles and engine speeds and compare them to PowerSpec.
  • Coordinate with your fuel supplier to ensure fuel quality requirements are met.  For maintenance-related information, we recommend consulting your fuel system provider for inspection guidelines and procedures in the event that water or oil enters the fuel tanks (this is more likely with CNG systems, since LNG does not contain water).
  • Prepare for seasonal changes. Natural gas and diesel engines require preparation for cold weather operation.  If an engine will operate in cold conditions, we recommend reviewing the Cold Weather Operation guidelines in the Natural Gas Driver Tips card.

For more information, please contact your local Cummins representative. If you would like us to follow up with you directly, please click here.