Possible causes of tower crane slip hook

1. The fixing screws of the contactor power supply inlet and outlet lines in the power distribution box of the tower crane are loose, the connection bolts of the terminal board are in poor contact, and the main contacts of the contactor are in poor contact.

2. The connection bolts of the motor rotor and stator coil have poor ablation and contact.

3. The wear of the brake pads of the high and low speed motors exceeds the requirements of the regulations.

4. The gearbox gear is broken and the fixed gear bolt is loose.

5. The lack of phase protector does not work.

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