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Re: 925d needle change
To remove the needle (1)Turn the main power switch to the OFF position. (2)Turn the hand wheel counter-clockwise by hand until the needle is at its highest position. (3)Loosen the needle set screw with hexagonal wrench
Reverse order to install new needle.
Click this link to download the users manual for your machine --->click here<---
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For the both you listed (brother 925d and simplicity 804d) it is a "15x1" which is a standard home needle. Same size the fits almost all home sewing machines. Make sure to put the flat side of the needle to the back.
The small hook that passes through the eye of the needle is bent or broken. If it is only bent it can be straightened with a small screw driver. If it is broken it will need to be replaced. Most dealers can get this part for you for about $5.00 sewman7
Probably your looper timing is off. This is common, and just a necessary evil of sergers. Their tolerances are tight.
The operation of creating a serger stitch is a succession of thread grabing and delivering. One looper grabs a thread and delivers it to the needle and so on.
To check this, turn your handwheel slowly and check to see that the upper looper is meeting the lower looper by passing very close to the indented part at the back of the lower looper (indented part is called the scarf, this is where the looper threads form a lock) If not, it's the looper timing. If they seem to meet properly then check your needle. Is your needle up into the needle clamp all the way? Try a new needle. Even a slight bend to the needle will not allow the loopers to meet and grab or deliver thread. You might check the tensions. Thread has to have some resistance in order for the loopers to do their job,
If your looper timing is off, find a sewing repair person to retime the serger. Don't try it yourself or put this repair off. If the loopers go further out of timing, they might hit something and replacement can be costly.