A construction worker was trapped under a front-end loader around noon yesterday after the vehicle overturned on a steep dirt incline at a construction site on Route 35 off the Asbury Circle. Ocean Township police, the Wanamassa Fire Company and Oakhurst First Aid responded to the former Ritz Diner property to find a 45-year-old Aberdeen man trapped under a Michigan Model C-90 front-end loader after the machine rolled over on its left side on the south side of the site.  The man was extricated from beneath the vehicle and was taken to Jersey Shore University Medical Center in Neptune after suffering a shoulder injury.