The following is a detailed explanation of some problems that may be encountered with electric hoists in operation:

1、 Electrical system issues

The power supply is not connected or the voltage is unstable

Problem description: The electric hoist cannot start or run weakly, which may be caused by an unconnected power supply or unstable voltage (more than 10% below the rated voltage).

Solution: Check the power connection to ensure that the power is connected; Measure the input voltage of the motor using a voltmeter to ensure that the voltage is within the normal range.

Electrical damage or circuit disconnection

Problem description: If the main and control circuit electrical appliances of the electric hoist are damaged or the circuit is disconnected, it will cause the motor to be unable to be powered on and thus unable to work.

Solution: Inspect the main and control circuits, check the working condition of electrical appliances and circuits, and repair or replace problematic electrical appliances or circuits.

Contactor failure

Problem description: Contact fusion welding or coil failure of the contactor can cause the electric hoist to fail to stop or not stop at the limit position.

Solution: Immediately cut off the power and force the electric hoist to stop; After parking, check the contactor. If it is severely damaged and cannot be repaired, it must be replaced.

2、 Mechanical transmission issues

Abnormal noise

Problem description: The electric hoist makes abnormal noise during operation, which may be caused by problems with the motor or gearbox.

Solution:

Motor noise: Check if the bearings are damaged, if the rotor is scratched, if there is single-phase operation or misalignment. For example, a buzzing sound usually indicates single-phase operation, while a clanging sound usually indicates bearing damage.

Transmission noise: Check whether the transmission housing, bearings, gears and other components are worn, and whether lubricants are regularly replaced.

Brake system issues

Problem description: When the electric hoist stops and slides further than the specified distance during braking, it may be due to wear of the brake ring, weakened springs, or improper adjustment of the brake system.

Solution:

Adjust the brake nut according to the instructions in the crane manual.

Clean the brake surface to remove oil stains and restore the friction coefficient of the brake surface.

Replace worn brake pads or springs.

Check and repair or replace the coupling.

Transmission oil leakage

Problem description: Transmission oil leakage is usually caused by worn or damaged sealing rings between the housing and cover.

Solution: Replace the sealing ring and tighten the bolts on the gearbox.

3、 Load and operational issues

Overloaded operation

Problem description: Overloading of electric hoists can cause serious problems such as motor heating and brake system failure.

Solution: Ensure that the electric hoist operates within its rated capacity range to avoid overloading.

Improper operation

Problem description: Improper operation methods such as diagonal pulling, emergency stop, or frequent start stop can accelerate the wear and damage of the electric hoist.

Solution: Standardize the operation method to avoid improper operations such as diagonal pulling, emergency stop, or frequent start stop.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment