Next take the tool needed this may vary depending upon the design of the door closer to make the change and turn the valve.
Eclipse door closer fitting instructions.
Rated 4 out of 5 by elterchris from overhead door closer fitted 3 of these in the last couple of weeks.
Found the arm to be a very tight fit on the square drive shaft one of the units but the other two were ok.
Eclipse 28989 adjustable size 2 4 overhead silver door closer.
Drill pilot holes in door and frame according to template.
Determine the power size required and using the supplied allen key adjust door closer strength as per chart on template.
Power adjusting valve must face away from hinge side of door.
Fitted and adjusted quickly.
To adjust a door closer you will first need to locate the appropriate hydraulic valve by consulting the instructions or specifications.
Remove slide plate and fix door closer body with screws supplied ensuring correct fitting holes are used.
This will usually be clockwise to decrease the speed and anticlockwise to increase it.
Good clear instructions lots of fixings and brackets for different configurations.