Do well follow three maintenance method, it is entirely possible to extend the mid-repair of your generator to 8,000 to 10,000 hours, and the overhaul to 15000 to 18000 hours. A level maintenance 1.When use Cummins generator ,check and record the operating state of the generator per hour.(check and record the power output,frequency, Oil pressure,water temperature, charging, smoke exhaust of the generator per hour) 2.Before open the generator,must check engine oil level and water level.(Before open the generator, let genset race 8mins,load on the genset when the sound of generator is normal.) 3.When the machine stop working,after genset cooled,need to clean face of genset.(Need to load on generator set firstly,let generator set race 10mins,then close down,so that let the pressurized gas and penalty kick be fully cooled. ) B level maintenance 1. Repeat A level maintenance process. 2. Check battery water level （ half above zinc sheet 1cm ） 3. Check every machine