Garage fire-door

I have an internal "fire door" to gain access to my garage. This door has hinges that will automatically close the door. Unfortunately the spring hinges have ceased to close the door completely (with the same force as before), i.e. I have to now push the door to close it securely.
I'm asking how do these spring hinges work? - are the broken (and need to be replaced) or do I need to adjust the springs (if so how?)
Thanks
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just get new ones Wayne

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wayne wrote:

You can adjust the tension if spring is not broken. Don't think all 3 are bad. There is small horizontal slot on the hinge top. You use hex key to turn up the spring while you move the pin in the slot. I am not good at explaining things but if you take a closer look, you'll see. If spring is broken, just buy replacement hinge of same size. Good luck, Tony
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Before you de-hang the door to replace hinges (which I have actually done one at a time leaving the door in place, BTW), make sure the hinges aren't just loose and/or door is sagging slightly, or that the weatherstrip hasn't popped out of place or something. On a big heavy door, installed with just the short factory screws, sagging is quite common. Especially so if the door frame wasn't shimmed as well as it could have been, a common occurance. Quick test-pull up on the knob with door open about 45 degrees. If you feel slop, the hinges are likely loose. 2nd cheap thing to try- wd40 on the hinge pin tubes, to flush out the gunk. If that brings them back to life, relube with the proper grease or silicone, since the wd-40 will quicly dry out.
aem sends...
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