The reasons and solutions for the inability to lift stainless steel lever hooks (stainless steel hooks) can be summarized as follows:

1、 Power system malfunction

Oil pump or variable motor problem

Reason: The low volumetric efficiency of the oil pump or variable displacement motor results in insufficient hydraulic system pressure, which cannot provide sufficient lifting power. The starting displacement of the variable motor is too small, which can also affect the lifting effect.

Solution: Replace the oil pump or variable motor to improve the efficiency and pressure of the hydraulic system. If the starting displacement of the variable motor is too small, the lock nut can be loosened and the small flow limit screw can be rotated clockwise to increase the starting displacement of the motor. Generally, the rotation should not exceed 3 turns.

Motor or reversing valve malfunction

Reason: Damage to the electric motor or malfunction of the reversing valve, resulting in the inability to transmit electrical or hydraulic signals properly, affecting the operation of the lifting mechanism.

Solution: Check the working status of the motor and reversing valve. If there is any damage or malfunction, replace or repair them in a timely manner.

2、 Brake system malfunction

Brake failure

Reason: The brake is severely worn or damaged, the main components of the brake are damaged or the main spring fails, electrical faults occur, etc., causing the brake to fail to brake normally, and the hook may slide down due to gravity during lifting.

Solution: Check the wear of the brake and replace severely worn brake parts or main springs. At the same time, check the electrical system to ensure that the brake can receive and execute brake signals normally.

Balance valve malfunction

Reason: A malfunction of the balance valve may cause the hook to lose control during the descent process, which may also affect the lifting process.

Solution: Check the working status of the balance valve. If there is a malfunction, replace or repair it in a timely manner.

3、 Hook and wire rope issues

Hook malfunction

Reason: After prolonged use, the hook may experience cracks, fractures, or deformations due to friction, overload, and other reasons, resulting in the hook being unable to carry or lift properly.

Solution: Regularly check the wear and deformation of the hook. If there are cracks, fractures, or deformations, replace the hook in a timely manner. At the same time, avoid overloading the use of hooks to extend their service life.

Steel wire rope issue

Reason: Insufficient oil, breakage, or disorderly winding of the steel wire rope may lead to increased friction between the rope and the pulley, severe wear, and even affect the normal operation of the lifting mechanism.

Solution: Regularly check the lubrication and wear level of the steel wire rope, add lubricating oil in a timely manner or replace severely worn steel wire ropes. At the same time, ensure that the steel wire rope is wound neatly to avoid disorderly winding that may cause malfunctions.

4、 Operation and maintenance issues

Improper operation

Reason: Improper operation procedures by operators, such as adjusting the dual brake braking torque too small or allowing the crane to operate with defects, may accelerate the mechanical wear and tear of the lifting mechanism brake, resulting in problems such as lifting mechanism brake failure.

Solution: Strengthen the training and education of operators, improve their operational skills and safety awareness. Ensure that operators follow the operating procedures to avoid malfunctions caused by improper operation.

Insufficient maintenance

Reason: Long term use of the hook without proper maintenance and upkeep may lead to serious deformation and wear of the hook mouth, affecting the lifting effect.

Solution: Regularly maintain and upkeep the hook, such as cleaning debris, applying lubricants, etc. At the same time, establish a regular inspection system to promptly identify and address potential faults.

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