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It is quite likely that the machine needs oiling. Somewhere in the drive train parts that need to move freely are sticking and causing the stitch length lever to drag back to a shorter stitch. Use a good quality sewing maching oil on everything that moves. Preferably use singer oil. under no circumstances use a "General Purppose oil". Machine oil is designed to evaporate leaving no residue behind whereas general oils simply dry out leaving a horrible brown varnish that actually gums up the machine. If your machine has brown varnish everywhere you look then this is probably the problem. You will need to thoroughly clean the machine with paraffin oil (kerosene) and then thoroughly oil everything as above.
The "dial" in the back is for decorative stitches which require a "programmer" to be inserted with the stitch formation you want to form. For a straight stitch no cam is required in the back of the machine. The three dials on the front:
Using the upper left dial select the straight stitch picture
Using the upper right, choose your stitch lenght
Using the lower, choose your needle position, left/center/right
The stitch length lever on some machines will back stitch when the lever is in the uppermost position. Bring the lever down to an appropriate stitch length and your machine should stitch forward.
try rethreading the machine top & bobbin make sure to get ever thread guide try chaning to needle, make sure the needle goes all the way into the needle holder-normally flat side goes to the back of the machine check to make the thread is moving smoothly around the tension dial if these suggestion don't help, then the machine probably could use a servicing
try changing the needle--flat side to the back of machine try adjusting the tension one number up--if it doesn't help put the tension back where it is check to make sure the bobbin is in correctly also check to make sure the bobbin is wound correctly it's also possible that the machine is out of time which means a sewing machine repair shop would have to refix the timing of the machine, because they have the tools for the job
I've got a Kenmore sewing machine and the back stitch is a button/lever on the front of the machine. It has to be held down when you want to back stitch, because when you let it go it stitches forward again. Hopefully that helps, I'm not sure what yours looks like. ( I couldn't find pictures of your model online anywhere.) :)
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