Lost manual, don't know how to adjust the stitch length

The following should help your memory. Regulating the length of the stitch: The machine can be adjusted to from six to thirty stitches per inch, as indicated by the numbers on the stitch indicator plate. Changing the length of the stitch is accomplished as follows: Loosen the stitch length stop control (B, Fig. 12) and move it to the bottom of the slot. Move the stitch length lever (A, Fig. 12) to the desired stitch length. Now, move the stop control up until the control plate (visible in the stitch length slot) touches the bottom of the stitch length lever. Tighten the thumb screw (B) with finger pressure only. At this point, the stitch length is "marked," and you can move the lever up to sew in reverse at approximately the same stitch length, and then return it to your desired forward length. If wrong instructions <?>, find your model... http://ismacs.net/singer_sewing_machine_company/manuals/singer-sewing-machine-manuals.html

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Set the stitch length to a larger number.
Decrease the top tension.

The stitch control unit is most likely seized due to dried oil.

Wheel on right side that controls the needle up and down is very tight...

It was working now it seems to be frozen the needle part wont move

How can fix stuck needle bar on my Bernina 730

How long has it been since you've cleaned and oiled your machine?

Your machine requires frequent oiling on the moving metal parts. Most likely the stitch length selector has begun to seize.

SINGER 6214 Manual Page 80

This may help:
Wheel on right side that controls the needle up and down is very tight...

The heated hairdryer may be a good choice to try.
...

If the bottom seems too tight you must loosen the top tension. If this doesn't seem to work to well then tighten the bobbin some. I've attached a guide on how to adjust tension.

take the machine to a sewing machine shop & have them check the screw
or the stitch length adjuster, the threads could be stripped out

Hello

Adjust the tension

Load your sewing machine with one color on top, threaded through the needle. Load the second color thread into the bobbin and thread.


Fold the scrap fabric in half, and sew a straight stitch at least 2 inches long. Look closely at the seam. If you see loops of the bottom color thread on top of the fabric, proceed to Step 3. If you see loops of the top color thread on the bottom of the fabric, proceed to step 4.


Loosen the top tension. Since the top tension is so tight, it is pulling the bottom thread up through the fabric. Loosen the top tension by turning the numbered knob on the front of the sewing machine counterclockwise by one number.


Tighten the top tension. Since the top tension is too loose, the bottom thread is pulling the top thread down through the fabric. Tighten the top tension by turning the numbered knob on the front of the sewing machine clockwise by one number.


Sew a straight stitch 3 inches in length. Check the stitching. It is perfect if the threads meet in the middle, and you can only see the top thread on top and the bottom thread on bottom. If it still needs adjusting, go back to step 2 to repeat the needed steps.


Using two different colored threads makes it easier for you to see which thread is being pulled.

Always use proper precautions when working with electrical machines.

Singer Machines are probably the easiest to set..
first thing you need to do is remove the thread..
Set you tension knob/wheel to the middle number.
When you rethread the machine, stop when you get to needle. Put the presser foot down and pull the thread. If it pulls hard then so far so good. If it pulls easily, the thread is not thru the tension wheel right. Thread the needle and stitch about 10 inches on a medium wt fabric.
The stitching should feel even on both sides. If the top still is tight, loosen it up just 1/2 number.
So, if your middle number is 4.5, turn it to 4. If it seems loose, turn it to 5.
Kelley

Needle Faces Where?  
I Need to Tighten the Tension....  
Changing a Needle  
Need Help  
Basic Questions-  
Bobbin Assembly Popped Out!  
Do You Think My Machine is Fixable?  
How to Change a Broken Needle  
Needle Bar Adjustment  
Oiling an Elna 3007  
Getting the Timing Belt Off?  
What Size Needles for My Machine?  
How to Oil my Machine?  
Where to Oil??  
Stitch Length Knob Woes  
Can't Seem to Put the Bobbin in Correctly  
Timing Belt Tension  
Adjustments  
Running Very Slow-  
Oiling Points on Singer 257  
Oiling My Singer Touch & Sew  
Singer 457  
Featherweight Case Odor  
Brother XL2010 Q's  
Does My Machine Have More Than One Belt?  
Cannot Seem To Adjust the Tension  
What to Do About a Gumming Up Needle  
How Tighten My Bobbin Tension, Please  
Is it Covered Under Warranty?  
Proper Threading Instructions?  
Just a Foot Pedal?  
Simple Threading Instructions for a 1036  
Threading a Singer 600  
Replacing a Blade on a Johnson Ruffler  
Changing the Needle  
Lubricating a Singer 1036  
Thread Balling Underneath  
Warranty Info  
Machine Covered in Hardened Oil  
Spindle Stuck?  
Do Motors Die?  
Singer 457  
Brother Sewing Machine  
Servicing My Machine-  
Belt Replacement  
Lubricating My Sewing Machine  

check out this. good luck. thanks.

Needle Faces Where?  
I Need to Tighten the Tension....  
Changing a Needle  
Need Help  
Basic Questions-  
Bobbin Assembly Popped Out!  
Do You Think My Machine is Fixable?  
How to Change a Broken Needle  
Needle Bar Adjustment  
Oiling an Elna 3007  
Getting the Timing Belt Off?  
What Size Needles for My Machine?  
How to Oil my Machine?  
Where to Oil??  
Stitch Length Knob Woes  
Can't Seem to Put the Bobbin in Correctly  
Timing Belt Tension  
Adjustments  
Running Very Slow-  
Oiling Points on Singer 257  
Oiling My Singer Touch & Sew  
Singer 457  
Featherweight Case Odor  
Brother XL2010 Q's  
Does My Machine Have More Than One Belt?  
Cannot Seem To Adjust the Tension  
What to Do About a Gumming Up Needle  
How Tighten My Bobbin Tension, Please  
Is it Covered Under Warranty?  
Proper Threading Instructions?  
Just a Foot Pedal?  
Simple Threading Instructions for a 1036  
Threading a Singer 600  
Replacing a Blade on a Johnson Ruffler  
Changing the Needle  
Lubricating a Singer 1036  
Thread Balling Underneath  
Warranty Info  
Machine Covered in Hardened Oil  
Spindle Stuck?  
Do Motors Die?  
Singer 457  
Brother Sewing Machine  
Servicing My Machine-  
Belt Replacement  
Lubricating My Sewing Machine  
check out this. good luck. thanks