The maintenance methods for pneumatic balance cranes include:

Cleaning and maintenance: Regularly clean the outer surface of the pneumatic balance crane to remove dust and debris, and maintain its good working condition. 

At the same time, it is necessary to clean the suspension device and work ropes and other parts.

Lubrication maintenance: According to the instructions in the user manual, regularly lubricate the moving parts of the pneumatic balance crane to ensure its smooth operation. 

When selecting lubricating oil, it should be determined based on the model and working environment of the balance crane, and high-quality lubricating oil should be used.

Regular inspection: Regularly inspect the key components of the pneumatic balancer, including pneumatic components, valves, sensors, etc., to ensure their normal operation and tighten the components.

Air pressure regulation: Regularly check and adjust the air pressure control device according to the load demand to ensure load balance and suspension effect.

Follow operating procedures: Strictly follow the operating procedures and safety requirements of the pneumatic balance crane to avoid overload and improper use, and ensure the safety and performance of the equipment.