When an electric hoist makes abnormal noises, the first thing to check is the chain. If the chain is twisted, it can get stuck in the sprocket not only causing noise but also potentially damaging the sprocket over time. If that's not the issue, then investigate other parts. If the electric hoist doesn't lift after being installed and started, you need to test whether the voltage meets the requirements. Both the main line and branch lines should be tested separately. Insufficient voltage can cause the hoist to malfunction. The voltage for oil tank hoists is 380 volts. If the electric hoist cannot stop, there may be a problem with the brake pads. Electric hoists use electromagnetic brakes that automatically stop when power is cut off.