Door and board lifters are generally simple tools which shouldn’t require much maintenance and as long as you use them within their specifications they should last a long time.
Clean and store
If the lifter gets dirt or other substances on it, you should clean and dry it before storing to reduce the chance of corrosion. You should store the lifter where it will not get damaged and can’t be affected by exposure to the elements.
Oil moving parts
If the door or board lifter has any moving parts they will benefit from occasional oiling with a general-purpose oil. This should ensure they stay in good working order and any steel parts don’t rust.