Our pumps do not require any maintenance provided one takes the following precaution: When there is a risk of freezing, empty the pump through the drain plug on the bottom of the pump body, making sure you prime it when subsequently starting it again : check that the foot valve is clean at regular intervals: if the pump is to remain unused for a long period of time e.g. in the winter. it is advisable to empty it completely, rinse it with clean water and store it in a dry place: if the shaft does not turn freely, rotate it using a screwdriver inserting it in the special slot. if this is not sufficient to solve the problem, remove the pump body, undoing the relevant mounting bolts,and clean it thoroughly to remove any encrustation.