Why Preload closer

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Low friction, high load needle bearings found in all LCN closers
If the closer arm is touching the door, it is because the arm or the closer body is not templated correctly. Confirm dimensions are taken from the proper location and make corrections if needed. 
The maximum door width that pivots have been tested is a 4' wide door.  Any door greater than 4' would shorten the life of the pivots. There is no maximum door height, for offset pivots the ru...
Butt hinges can be used on  doors up to 4' wide and 200 pounds.  There is no maximum door height, just need to add a hinge for every 30" or part there of over 7'.
For a door closer that tries to open the door instead of closing it:The closer body could be mounted backwards on the door - check instructions for proper closer orientation.It could be the wrong h...