Keep the machine well lubricated.lnject the lubrication oil(20# and 30# oil)into oil holes befors and after each use.lt is highly recommended,when finishing the operation,that you lubricate the machine after 2-3 minute free rotation and keep it at a dry place.   Keep the electric part of the machine from getting wet.lt is prohibited to operate the machine in water.lf a small amount of the waste water accidentally getting into the machine open the machine cover immediately and clear the water. When the insulation resistance of the machine is less than 2MΩ,it indicates the machine is wet.To assure personal safety and prevent the machine from damage,stop operating the machine and put it at a p;ace dry and ventilated until the insulation resistance restored to more than 2mΩ. Prior to the next use after long time storage,check the machine for free rotation,then turn on the control switch.lf the machine shaft does not rotate the motor is running or the handle is pressed,it indicates the machine rusted inside.Turn off the electric piwer immediately to avoid the electric damage.Reoperate the machine only after a self-check or an inspection by an authorized dealer is done. After finishing use of the flexible shaft and drills,flush and dry them clean.Lubricate them with iol and keep them at a dry place to  prevent rusting. Warning:Shut down the machine and disconnect the electric power before making any adjustment,accessory assembly and maintenance. Warning:Use approved rated power supply and less-than-10A fuse.