I have a wall oven, a St George single oven. The

The hinges mount inside the oven door, open the door all the way, then move the small clips that are riveted to the hinge to the position opposite of where they sit now... this will hold the hinge springs open. Lift up the door as if to close it, then the hinges will lift out of their slots and you can remove the door... Electrolux Range Stove Oven Door Hinge 318244305

Most oven doors can be removed by opening door and pulling straight out. The hinges are attached to the oven frame not to the door. Some oven doors have screws that are attached to the hinges at the bottom of the door on the inside that need to be removed, then pull straight out.

Hi Elspeth:
Don't know what make or model you are dealing with, but from personal experience, here's what I dealt with.
- Oven door is mounted on spring loaded hinges. That's what keeps it in the closed position.
- To remove the door, it has to be fully opened, then lifted from close to the hinges, and slid out.
- To put the door back on, the hinges have to be in the "door open" position. Since they are spring loaded this can be tricky getting them into position.
- It's easier with a helper, one on each side....... slide the hinge legs into the slots. You'll need to lift the door slightly towards the closed position to allow the hinge legs to engage in the secure or latched position.
Hope this helps.
Cheers.

Can't find your model # but maybe this can help:
St. George Oven Manuals

Hi There
I found this for to read so you can fix your door.I hope this will help you.Let me know how it goes.
The oven door won't close If your oven door has gotten bent or warped (maybe you rested something heavy on it…), you need to remove the door, disassemble it, and straighten it. You can lift most oven doors off of their hinges by opening the door several inches to its first "stop," and lifting the entire door straight up. If the hinges have become worn, damaged, or bent, you probably need to replace them. We recommend replacing both hinges at the same time, to prevent uneven wear of the undamaged hinge.
Thank you for writing to fix ya.
Best Regards Richard

green is always grounded

Usually there is a hole that you open the hinge and put a nail in on each hinge to hold them open until you get the door in place.

http://www.sga.com.au/User-Manuals/default.aspx

Anyway that will get you to the right people.

should be a clip on each side of the door. hold them in as you slide the door back on.

open door fully. there is a hinge lock - usually a little arm on the hinge which comes up. engage hinge lock, partially close door and lift off