Replaced belts several times over the years and never had this type of issue. This set installed just as easy as others did. When I ran my 380 with these new belts installed it would hit a wall and just stop running until the backup valve kicked in. After the backup completed it cycle my 380 would once again run until it hit the wall. When I looked at I could see the wheels stopped turning. After a few minutes of tinkering, I realized that the belt was just slipping on the gears of the wheels anytime there was a little friction.
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