You should water a Cleveland pear tree just enough to keep the ground around a the root ball moist.Heavy watering should be done about once a week.Clevlenad Pear Trees do not like to be dry.
This variey of pear tree is very draught tolerant. It should be watered initially when planted and then keep it moist . Add mulch to the base of the tree to help retain moisture. Normal watering when not under drought conditions.
Like other fruit trees, a Cleveland pear tree should be watered frequently enough to keep the roots moist. Depending on your climate, this would be about once per week.