Maintenance on 22kw-150kw liquid cooled generators. Includes coolant flush/spark plugs/airfilter/oil change+filter/magpick up cleaning, belts/pulleys checked, sliprings cleaned. If equipped alternator gear box fluid change. The battery is not included in this price and will need to be replaced every 3-6 years depending on battery type. Add $180 if replaced. Battery will be checked yearly"terminals cleaned and checked for leaks"