Note : 1.When install or disassemble servo motors , pls don’t knocl motor and shaft , or it will damage the encoder . 2.Pls try best to prohibit the vibration of axle base to avoid the damage of shaft . 3.Motor and driver should connect reliably to avoid the damage of motor and encoder . 4.When installing , pls make sure the motor shaft and load shaft concentricity . http://www.wotomotor.com/