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1. Make sure the bobbin assembly is clear of all left over rags, threads, etc.
2. When you return the hook (sharp thing) it needs one drop of oil on the track. (track is what the hook rides on)
3. Take off the top and bottom lids. (Not too difficult)
4. While turning the hand wheel you will see parts moving. At areas that you see metal against metal movement. Place sewing machine oil on these areas. You may want to start by cleaning with a qtip first.
5. Make sure the needle arm (going up and down that is attached to the needle) gets oil. Also, put a small amount of oil on the pressure foot arm. (has a spring around it)
6. If it isn't still working as fast as you would like do the following.
7 Remove the plate that surrounds the hand wheel.
8. The rubber part that goes between the motor and the hand wheel may need to be replaced. (Not usually the problem) Just give a glance and see if it is in bad shape. If so then replace.
9. The motor and the hand wheel need to be aligned. Loosen the bolt that attaches the motor.
10. (Remove needle) Give the foot pedal some pressure and move the motor to a point where you hear the motor move the fastest and with very little resistance. This is where you will tighten the motor.
11. Put your machine back together.
THROAT PLATES ARE HELD ON EACH SIDE WITH A SMALL PIECE OF METAL (SPRING). 1. PLACE THE PLATE AT AN ANGLE OF THE THROAT. 2. AT THE SAME TIME CAREFULLY PUSH EACH SPRING UNDER THE PLATE. 3. SLIDE THE PLATE TOWARDS THE AREA WHERE THE PLATE SHOULD FALL INTO THE LOWER POSITION.
1. Take the top off.
2. Check to see if the bobbin winder has pressure as you move it back and forth. There should be. If not then check for a spring connected to the bobbin and reset it. There will be some kind of post to hook it to.
3. Place the bobbin winder in the "off" position and put the top lid back on.
4. Without putting the screws back in move the bobbin winder to the "on" position and to the "off" position.
5. There should be pressure either way you move the winder.
6. Loosen the hand wheel handle.
7 With the bobbin winder in the "go" position use your foot pedal to make sure it revolves.
8. Replace the top.
unless it has been progressively getting slower, I did have a simular issue. My pedal was getting "stuck" at the 1/2 mark. (wasn't pressing all the way down). Drove me nuts. Took the machine apart, cleaned oiled, cleaned again blah blah blah...when the pedal was the last option took it apart and found a nut from a screw had gotten inside the pedal and stopping it from pressed down. There could be a burr, a nick or something it is catching on.
It is a good idea to clean as you did. However, you must put the needle plate back on the machine first, then the bobbin case is inserted(more on that) then the "L" shaped gray cover. Make sure the b-case is laying level on the surface of the hook and the little bump at about 6 o'clock on the case is touching the spring at about 6 o'clock in the machine. Test a sample.
I'm having a similar problem today. I took out the bobbin case and when I went to put it back in, the whole system locks up. I've tired cleaning, changing needle taking the metal plate and piece that holds bobbin case out and put it all back in after cleaning. Nothing. My symptom is I can't get a complete stitch, the needle goes down, the whole deal acts like it will work and as soon as the arm of the bobbin case gets to 8 o' clock on the gears, It jams and won't hardly move. I cannot pull the bobbin case out easily after this. Perhaps there is someone out there that can help us!
Found a solution to my own problem.... hope this helps someone else. Make SURE the bobbin case is seated correctly! (follow the instructions carefully). Don't put the cover back on right away after you put the bobbin case in. First check and make sure it doesn't move when you turn the hand wheel.
Also, when threading the bobbin make sure the thread passes down through the tension adjusting spring of the bobbin case.