Start by removing the locking pin photo 1.
How to adjust a door hinge spring.
If your hinge has a tension pin inserted into the side of the hinge you need to pull the pin from the hinge with needle nose pliers.
However if your door slams or doesn t latch properly as it closes you may need to use a couple of tools to loosen or tighten the spring tension.
Remove the locking pin.
Self closing hinges have springs inside of them that force a door closed so you don t have to worry about shutting it yourself.
Then add or release tension until you get the proper close rate photo 2.
I ll bet that you never knew you could adjust a self closing door hing.
Adjusting a spring loaded hinge must be done with the door closed.