Always check the "Cooling Fan Manufacturer" bearing lubricant oil, if the oil spill box appears, you can put the end cap bolt tightening that this is not enough, it may have to replace it with new packing up.
"Cooling Fan Manufacturer" normal use when lubricating the bearings should be replaced at least once in six months, when the first time, after about 200 hours of operation performed, the second oil change time in 1 to 2 months, should be a week later check the oil once, such as "Cooling Fan Manufacturer" no deterioration of lubricating oil, the oil change work may be extended to two to four months time, you must use the specified grade oil when replacing the old oil tank completely and put a clean Fill with fresh oil and to clean later.