concealed spring open force adjustment

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Yes, the spring torque on 3SP1 butt hinge is adjustable.   See the 3SP1 instructions:  
  How to:  What are the steps to adjust a door closer?   Facts: All LCN and FALCON door closers will have 3 regulating valves and a spring adjustment.  All cl...
Mechanical pre-loading of spring to adjust closing force
The Date Code and Closer Size are stamped in the backside of the closer body. Closer Size: If the number is "1", the closer is a 2031 or 5031. If the number is "3", the closer is a 2...
A 4600 (4630/4640) not opening to a full 90 degrees could be caused by a couple things: The Opening Force could be set too low. Try increasing the opening force adjustment on the controller a 1/...
The manual opening force on a 4630/4640 will be approximately 8.5 lbs to 14 lbs depending on the spring setting.
The older model Senior Swing came with 2 spring options. The "standard force" spring required 15 lbs of manual  opening force, and reduced force "RF" required 11 lbs of manual opening force.  All S...