A wheelchair is the second pair of feet for an elderly person who has a lower-body disability or limited mobility. This is true for many people. After buying a wheelchair, as long as the wheelchair does not malfunction, they generally do not go to check and maintain it.
Reassure them, but this is wrong. Although the manufacturer can guarantee the quality of the wheelchair, there is no guarantee that it will be okay after you use it for a period of time, so in order to ensure the best condition of the wheelchair, the wheelchair needs regular maintenance.