For better operation, it should be run a bit faster. This so the claw opens faster and helps so the edge of the culvert doesn't 'slide' off the end of the claw, instead just drops. if that is the fastest it runs in the video, the motor mechanism needs adjustment. The grapper needs to move a little farther down the beam. This adjustment is not easy. You need 2 pair of pliers to very slightly twist the heavy gauge driving arm to adjust the movement. Finally about the culverts, try using a dab of rubber cement to glue on a small piece of sandpaper right where the culvert sits first in line to be picked-up on the ramp at the bottom.
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