How to install the belt of singer fashion maker rotomatic with adjustment of timimg and fittmentof belt

Question edited for clarity and add maker.

Well it would! Why on earth did you oil the belt? Belts are supposed to grip not slide. Oil will also cause the belt to soften and stretch.

$10 for a new belt. Make sure you thoroughly clean the surfaces of all traces of oil.

https://www.google.com/search?q=Singer+FM17+Fashion+Mate+belt+replacement

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A setting must be wrong. Videos and text based articles

https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk02OAdBVFu0uGUaJzw3x1UCbp5iYlQ%3A1603484942388&ei=Dj2TX5-eF5vPtQb6ioOwCA&q=singer+3342+fashion+mate+making+button+buttonholes

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I believe that is top loading Apollo bobbin case if so, facing the front of the machine underneath bobbin cover/door there should be a bracket on the left (holds bobbin case) move it back, set case in with the cut out pointing to the back of the machine, you may have to wiggle it a bit until you feel it is seated the move the bracket back over the bobbin case

Is this a Singer Fashion Maker Rotomatic 974?
Enter 974 into the Singer Manual search below:

Instruction Manuals

Try Youtube!
Cheers,
Kelly
Embroidery Services
San Diego, CA

Contact a Singer Dealer.

You may download a copy of the manual at http://www.singerco.com/uploads/download/a79240489cb7c4349c6a33b61f0e5b92e3e0384c.pdf

my machine is too old its 998 singer fashion maker i dont have manual book what can i do please tell

i have singer fashion maker classic model 298 it was not used for a long time so i got it serviced but i dont know which stich to be used for different materials every time the stitch ring should be changed also

Here's how you set the timing od the Machine alright:
1. Take the side plate off, take the needle plate off.
2. Take the presser foot off, and put a new needle in the machine. 3. Make sure that the needle is in the lowest position and look at the needle bar for the two timing lines. Locate the top line.
4. Then, turn the handwheel toward you until the top line is where the bottom line was.
At this point, the tip of the hook should be directly in the scarf of the needle.
This should set the timing of the machine perfect....