Seems like there was just a thread like this, but I don't see it. Maybe it was about cider apples. <scratches head>
Some trees are strongly biennial. They bare every second year with little or nothing in between. If it drops fruit early it might be a case of june drop. Plenty of info online about June drop. If the roots are oxygen starved the fruit will likely drop later than June but when still immature. That can happen from laying plastic or landscaping fabric around a tree for weed control. Remove the barrier and aerate with something like a Garden Weasel or sod aerator. Compost & use mulch for weed control and it should recover just fine.
50 lbs of pears is nothing compared to what a well maintained tree can produce. A couple years ago I got nearly 400 lbs from my mechanic's standard pear. It hadn't been topped in years, if ever, and most of the fruit was out of reach. I got all that 400 lbs. with a 12' picker. Considering the tree was over 30' tall you can imagine what was left on it.
By the way, all I can say about pears is don't bother planting standard trees. They are long lived and don't bear for a very long time. Semi-dwarfs have a shorter life span but will bear in 3-5 years. Semi-dwarfs will likely be on OHxF (OHF, Old Home x Farmingdale) root stocks. I'd look for OHxF 333 as it's very disease resistant and productive. A good nursery can recommend what you need.
Look for a nursery that is at your latitude or more northern if you're in an area subject to freezing. Even trees rated for your zone will be more likely to split of grown further south.