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Angle grinder, angle grinder is the most vulnerable of the brush. Brush wear and tear it to pieces and the rotor for the contact resistance will increase, spark increases, ranging from singeing the rotor, heavy then burned the rotor. for a long time and maybe even the stator will be burned, it must be regularly checked, and timely replacement. replacement and original hardness of the brush to line the same length, otherwise it will increase rotor wear. the most important thing is to brush and Block size with appropriate, not loose not tight and if tight, can wear a small brush and then installed properly because the brush at work on the high temperature than the temperature transposons, and transposon expansion after tight card account dead, brush and commutator will be bad, causing the rotor arc discharge burning.
 In the machine head has a locking button pressed before disassembly angle grinding long-term use due to adsorption of dirt and become flexible, easy to pop up after pressing, if not replaced after the pop-up angle grinding, once the boot on the easily broken gear in the overhaul, as long as the "carburetor cleaner" spray washed the dust off a few, will be able to restore flexibility.

 Replacement grinder, angle grinder to carefully observe the bearing the bearing is complete if the closure of the bearing cap is incomplete or lost, it is necessary to replace all the internal lubricant, or mixed with iron filings in which the broken will damage the gear.

 If you replace the angle grinder, angle grinder stator, do remember to install the plastic ring on the outside, because it plays a role in setting the direction of airflow. With it, the air was forward at high speed on the rotor blades pumping and emitted from the nose, the effective cooling the rotor and the stator coil to prevent temperature rise. or prolonged use, the coil is bound to overheat.

 If the motives for repeatedly twist the screw head may cause the plastic body of the screw holes and slippery larger teeth, can accommodate some cotton yarn, glue and then drops 502 or 101, to be screwed into the screw can be dry.