Can an orange tree be saved?

[Major Nikon]

1. There could be a number of reasons why it doesn't produce

The first thing I'd check is how much sun it gets and how it's pruned. If it's flowering OK and you aren't getting fruit it could be soil, fertilizer, drainage, or other water issues.

If you are really concerned about it, then you might want to consider hiring an arborist, or your local county extension office may be of some help. If you hire an arborist and they prune it, ask lots of questions and pay particular attention to how they prune it, as fruit trees need to be pruned from time to time in order to produce the best fruit.