My sliding gate slows or halts at the same point. What is wrong?

Look at the track first. Sand, pebbles and dry leaves gather in the channel, and the carriage wheels ride up on them at one spot. Release the motor and push the leaf by hand; it should glide easily. If it still binds, suspect worn wheels, a sagging rack or a leaf that sits low on its guides. Raising the force only masks the fault, so we correct the cause.