Retractable column maintenance:
1. Clean regularly
2. Do not touch sharp objects
3. Do not touch corrosive chemicals
Trolley maintenance:
1. Periodic inspection and maintenance
2. not overweight use, not up and down the elevator
3. Push the wheel barrow, press the handlebar in time to release the brakes to prevent wear and tear on the wheels
4. To avoid long-term exposure to rain
5. Clean regularly
