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Service Seminar Volume 2

Service Seminar Volume 2. Table of Contents VOLUME 2. Lower Shaft Removal…………….……………..................................................1-10 Lower Shaft Installation…………………………………………….…………….11-16. Lower Shaft Removal. BASE AND BELT COVER REMOVAL SEE PG. 1-VOL 1

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Service Seminar Volume 2

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  1. Service Seminar Volume 2

  2. Table of Contents VOLUME 2 Lower Shaft Removal…………….……………..................................................1-10 Lower Shaft Installation…………………………………………….…………….11-16

  3. Lower Shaft Removal • BASE AND BELT COVER REMOVAL SEE PG. 1-VOL 1 • FACE PLATE REMOVAL SEE PG. 14-VOL 1 • TOP COVER REMOVAL SEE PG.15-VOL 1 1. Lay the machine down. Loosen the screw on the left side of the machine that holds the thread cutter cover and remove the cover. 2. Stand the machine up. Remove the A- foot, the needle plate, bobbin case and needle. 1

  4. 3. Remove the two screws that hold the thread cutter in and remove the cutter. 4. Swing the thread cutter drive arm to the rear of the machine to keep it out of the way of the thread cutter cam. 5. Stand the machine up on its head with the rear of the machine facing you. Be careful of the spool pin holders that they do not crack off when you are doing this. 2

  5. 6. Remove the C-clip that is holding the feed drop lever bracket to the hook base unit. 7. Carefully lift up on the bracket making sure not to lose the spring and place it to the side. Rest the feed drop bracket on the machine leg that is towards the back of the machine. 3

  6. 180 from each other 8. *Notice that when you line the shaft up to remove the screw from the thread cutter cam, the feed cam and thread cam screws are facing the opposite way. They are a complete 180 from each other. Lined up 9. Also notice that the position of the lower shaft belt timing gear pin is lined up with the screw head that is in the thread cutter cam. It might be helpful to make markings for yourself on a piece of paper when you are about to do this. 4

  7. 10. Remove the screw from the thread cutter cam and remove it. Make sure the thread cutter drive arm is still out of the way for easy removal. Remove the felt too. 11. Turn the shaft a 180 and remove the screws from the feed cam and thread cam. 12. Turn the shaft until you see the screw in the lower shaft shield plate and remove the screw and the black plate under the screw. 5

  8. 13. Loosen the idler unit that is holding the pressure against the timing belt on the outside of the machine. Remove the timing belt from the lower shaft outside belt gear. 15. 14. Using the 2mm hex driver loosen the two screws on the two separate black collars. 6

  9. 15. Using a 2.5 hex driver loosen the two screws on the lower shaft timing gear. 16. Take the hammer and hit the lower shaft to the right about an inch. If the black collar moves towards the feed lift cam take the 2mm hex driver and insert it into the screw hole in the black collar and keep it to the left side by the bushing. 7

  10. 17. Move the feed lift cam to the left and remove the pin that is now exposed. Notice that the pin is facing up the same direction as the screws were on the feed cam and thread cam. 18. As you go to hit the lower shaft out be careful to only hit the shaft in the center and not near the edges. This will prevent extra scarring on the shaft. 19. Continue to hit the shaft to the right. When you get up to the collar use a blunt screw driver or a flat head screw driver to use as a guide when you continue to hit the lower shaft to the right. 8

  11. 20. As you hit the lower shaft out, remove the pieces and line them up for later assembly. Use a piece of sandpaper or file to smooth out the scar marks on the shaft. 21. *** It is very important to smooth out the scar marks to protect the machine and to make it easier for yourself.**** 22. After you smooth out the scar marks you should be able to remove the shaft by rotating it outward, this will help save the lower shaft supporter from snapping. 9

  12. 23. When you get the lower shaft out inspect it to make sure that it is not bad. Sand out the scar marks in the lower shaft. Do not over sand the shaft. You only want to do this until the lower shaft timing gear can slide on and off easily. 24. Preparation for lower shaft installation. 10

  13. Lower Shaft Installation 1. After you have prepared your lower shaft, move the timing belt out of the way and slide the shaft into the right side bushing. 2. As you slide the lower shaft in, replace the felt circle and plastic c-clip and continue to slide the lower shaft to the left. Replace the lower shaft shield plate, making sure that the opening for the screw is to the right. 3. Continue to slide the shaft to the left and pass it through the supporter. Replace the other felt circle and white plastic C-clip. 11

  14. 4. Replace the metal feed cam with the screw hole to the right, larger part ends up within the feed fork and replace the thread cam with the screw hole to the right. 5. Continue to slide the shaft in to the left and replace the timing gear with the brass part to the right. 6. Take the feed lift cam and insert the feed lift spring with the larger end going into the hole that is in the inside of the feed lift cam. Take the black collar and put the smaller spring end into the hole on the collar. Make sure that the washer is on the other side of the collar. 12

  15. 7. Place the four pieces into the machine. Using your screwdriver insert it from the outside of the machine through the left side bushing and through the four pieces so it acts as a guide and holds them in line. 8. Continue to rotate the shaft far enough through the bushing so the marked line on the shaft is visible to the left side of the bushing. 9. Push and hold the feed lift cam to the left and reinsert the feed lifting cam pin. Make sure that the timing mark on the lower shaft belt gear is a complete 180 from the pin. 13

  16. 10. Place the two white washers onto the lower shaft followed by the black collar. Slide the shaft through making sure that the marked line is now to the left of the black collar. Tighten one screw on the collar 11. Using your fingers take the left collar and the right collar and hold them towards the bushing and tighten one 2mm screw on the right side collar and check to see if the left to right play has been removed from the lower shaft, then tighten all the screws on the collars. 12. Line up the feed cam and the thread cam with the screw hole facing up the same way that the feed lifting pin is facing. They should all be in line. Insert the screws and tighten them. 14

  17. 13. Turn the shaft 180. Move the thread cutter drive arm out of the way and replace the thread cutter cam and insert the screw. This screw will be exactly 180 from the feed cam and thread cam. However it will be in line with the timing mark on lower shaft belt gear. 14. Place the feed drop spring back into the feed drop bracket and place it back into the machine with the C-clip to hold it in place. 15. Make sure that when you insert the bracket into position the drop post is to the right side of the feed lift cam. 15

  18. FOR FEED TIMING, UPPER AND LOWER SHAFT TIMING USE PG. 43-VOL 1 • FOR NEEDLE TO HOOK TIMING USE PG.32-VOL 1 16. Lay the machine on its back. Turn the hand wheel so you can put the take up lever into its lowest point. The screw hole in the shaft should be facing towards you. 17. Carefully take the black plate and the screw and place it on top of the shield plate. Carefully insert the screw making sure that the shield plate blades are in the middle of the photo sensor. Tighten gently making sure that you do not crack the shield plate. • FOR THREAD CUTTER REPLACEMENT USE PG.37-VOL 1 • FOR THE BASE INSTALLATION USE PAGE.71-VOL 1 • FOR TOP AND BELT COVER INSTALLATION USE PAGE. 68 AND PAGE.72-VOL 1 • FOR FACE PLATE INSTALLATION USE PAGE.73-VOL 1 • 18. Install the bobbin case, needle plate and presser foot and test the machine. 16

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