How to Maintenance Angle Grinder?

For those who use angle grinder every day, are you care and maintenance angle grinder regularly? Usually ignored maintenance of angle grinder, angle grinder is also need maintained, so as to prolong its life.
1.Check the brush for wear too short, timely replace the brushes, in order to prevent poor contact to burned armature.
2.Always check the power cable is securely connected, plug is loose, the switching operation is flexible and reliable.
3.Note that the inspection tool inlet and outlet, and remove the oil and dust in the any parts.
4.The angle grinder need to add grease when used a certain time.
5.Check the angle grinder tag. Can not use unmarked unqualified angle grinder.
6.Test rotation strength of angle grinder, conduct random testing, angle grinder without detection must not installed and used.