I took the shuttle apart to clean but have problem aligning/synchronising the needle and shuttle /bobbin movement. I should have taken a picture before I took them apart. What should the correctly assembled shuttle bobbin part look like?
The shuttle/race/bobbin system shouldn't really be taken apart by the average user. Unfortunately, your chances of ever getting it back together properly so the machine will sew (this is the timing of the machine) are very slim. You'll need to take it to a sewing machine technician. I would recommend an authorized Pfaff tech as they'll be sure to have the proper tools to do this correctly - won't be inexpensive but will be worth it. Most "neighborhood sewing machine repair folks" don't have experience on computer machines. Resetting timing on a computer machine isn't the same as the old mechanicals and requires some expertise.
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The needle height is best checked by rotating the handwheel until the needle goes down through the stitch-plate (Make sure you're using a zig-zag stitch plate and not a straight stitch plate) and just starts to come back up again. Stop there. Gently push the needle bar to the right until the needle is at its furthest-most travel right (next to the right-hand edge of the needle slot). Tip the machine backwards slightly and drop the bobbin door; take the bobbin out. Open the hook/shuttle retainer, but leave the hook/shuttle in the hook race. The point of the hook/shuttle should be somewhere near the top, just below the stitch plate. Slowly rotate the handwheel until the point of the hook/shuttle passes just behind the needle; The point on the hook/shuttle should be just above the thread hole in the needle - if-so, the needle is at the right height, assuming the machine is properly synchronised. If its at the wrong height, you would need to have the needle-bar mechanism adjusted to put it right (relatively simple) - you cant just try and fudge it by adjusting the needle height using the needle securing screw. If you need help with re-setting the needle bar to get the right height, I can help, but you really need to be sure that the machine is properly synchronised first, so this may not be the total solution. Hope this helps.
Actually,timing of needle vs, shuttle is not very easy job several factor you should check on.There is belt ot sometime a shafting with worm gear and helical gear under machine w/c drive the shuttle with the bobbins in timing order,Any one of them is present on the timing adjustment can be done by releasing the belt or the helical gear,besure machine is unplug then set all mechanism on low dead center meaning the needle move to utmost lower position catching this by the shuttle and bobbins at center position.No motion applied if this was set up,engage the belt with pulley and the bobbins link holder tigh allenscrew besure the needle is lower dead center at the center of shullle bobbins catching needle without motion when setting back at original position.If this was made manually move it on handwheel going up and side down the needle gradually if the needle move freely several time and it was catching this by the shuttle hook bobbins.if ok put thread bobbins and upper thread dial tension with the needle.Move machine on handwheel try to catch the bobbins thread,If this so your machine is ready to sew again if problem occurs on alignment repeat adjustment on perpect alignment,besure all parts on upper casing of machine specially two drive gear are in normal alignment.
Have a look at www.sewusa.com they have a "repair & threading page" this may help you re-assemble your machine. It is impossible to explain how to put the thing back together and re-time it, it is something you need to be shown how to do. Other alternative is to take it to a sewing machine tech.
I had the same problem with cleaning and jamming and this might sound silly, but when you're in the middle of trying to fix it remember to look up see that it is threaded up top. I did everything the pp's suggested and when they didn't work I realized the top thread wasn't still threaded around the tension thing anymore. After rethreading it, it worked fine. But I DID reduce the amount of thread on the bobbin at the same time as Drazil suggested.