1.Overheating of speed reducer
A.Overload running—adjust to suitable load.
B.Excessive friction of oil seal—add lubrication oil to the oil seal.
C.Improper connection of output shaft and transmission device—adjust to proper position
D.Too heavy impact loading-replace bigger model of speed reducer
2.Noise of speed reducer
Overload operation—adjust to proper load.
Bearing damaged or too big backlash—replace bearings
Loose of bolt—Tighten the bolt
The transmission is not fixed properly—Fix the transmission device.
3.Speed reducer doesn’t work
Abrasion of gears—replace gears
Motor damage—repair motor
Error of wiring—wiring according to the instruction