Mini electric hoist caused the causes of damage

Mini electric hoist caused the causes of damage
Mini electric hoist  Wire rope hoist  belongs in one, which by definition is starting weight at 500kg or less, also known civilian mini electric hoist electric hoist, easily damaged, so what causes it? Rebar lifting for you to answer the following:
1 Due to  wire rope hoist itself quality problems, likely to occur in the work line short circuit;
(2) long-running motors, run for up to one hour or more likely to cause damage to the motor inside the original;
3 Ground hampered not properly grounded;
4 overload to use,  hoist equipment overwhelmed;