What should we do if the casters of the shopping cart can't work ?

  We are all familiar with the supermarket shopping cart, and the shopping carts provide convenience to the customers. The universal casters on the shopping cart is flexible to use and can change direction freely when used. So what should we do if we come across a shopping cart with casters that don't work?

  First of all, we need to prepare some lubricating oil and add it to the universal casters of the trolley. The lubricating tool can be a needle or a stick. Then, you can take the whole cardan casters off. Wipe off any foreign matter on the axle with a tissue or dry cloth so as not to affect the flexibility of the rotation. Finally, add some lubricating oil where the axle is in contact with the casters, and then fix the universal casters to the shaft and rotate it a few times so that the lubricating oil can be evenly coated on the shaft. Several other casters are installed in the same way with lubricating oil and then installed. 
In this way, the trolley will be very flexible when it turns.If you have a problem with your shopping cart, do you know how to fix it?