I know nothing about orange trees, but general transplanting advice: if you had to trim roots to move it, you need to reduce stems to match (=> prune). Otherwise the leaves make too many demands on the reduced roots. Also, some shade helps, since this reduces water loss from the leaves, especially in the hottest time of the day. Don't over-fertilize, the tree is growing new feeder roots and can't take much up yet. What fertilizer you do use should be a transplant fertilizer to assist root growth.
Good luck with it.