Help!I have ano Elna 72oo.The shaft that holds the needle does not go up and down. The flywheel goes round but nothing happens.

either a jam up in the bobbin which is preventing the needle bar from coming up, internally siezed up, or the friction belt internally to the flywheel has broken/worn out.

There are a couple of different SU models, the Star Series and the Air Electronics both had an SU (supermatic) model so I'll be general in my description. Firstly remove the needle cover plate and check around the bobbin race for jam ups. Or if the machine has been packed away for a long time unused, then we could assume this is a sieze up. FIRST REMOVE THE POWER PLUG FROM THE MACHINE FOR SAFETY. You'll need to remove the top machine cover and delve into the insides with a bit of patience, good quality sewing machine oil (tri-flow is perfect if you can obtain some, bike shops have it or I got mine from Ebay) and Qtips or something similar.

There should be a couple of screws holding the top cover onto the machine so remove these and then lift and tilt the cover to the back around the lifting handle and making sure you clear the bobbin winder mechanism on the right. Really good idea to take photos with your mobile as you go so you can remember where things went. Now apply triflow to the metal moving parts you can access, in particular the top of the Elnagraph shaft which should have a red mark for oiling point, and the needle bar swing bearing. Keep oil away from the belt/s on the right side of the machine where the flywheel is driven by the motor.

You'll need to carefully clean, oil and gently move the flywheel back and forwards until things free up.

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Try unscrewing the needle, and then pull up the plate, and sort outthe threads very carefully with a quikunpick. When starting to sew, have slightly longer threads, make sure they are behind the needle, and hold them in your left hand. Especially when sewing very fine fabric, start slowly until you are sure the threads are forming properly, then it's OK to speed up. Use your ears, if it doesn't sound right, stop immediately. If you are going to use fine slippery fabric, be sure to do a trial piece first, rather than muck up your project. Elna machines are lovely to use, I've had one for over 40 years, still in daily use. Oiled with one spot of oil each time I use it, fluff regularly cleaned from underneath with the little brush supplied.

Replace the needle.

Remove thread. Remove the needle plate. Turn hand wheel toward you. Rethread machine. Make sure presser foot in up position when you thread needle. Make sure needle all way up in shaft, flat side back and more rounded side facing you Turn hand wheel toward you again and observe the following: As needle comes down, make sure the needle's eye makes pass by the scarf of the needle. Hope this helps, and if not, try sewvacdoctor.com

Turn the flywheel towards you until the needle is at its highest point, then unplug the machine and turn the thumb screw on the needle bar that holds the needle in place. Turn anticlockwise to undo.

Remove needle, and place a new one into the housing, flat shank to the back, and holding it all the way up, tighten up the thumb screw.

First please double check that the flywheel clutch in engaged and not in bobbin winding mode, ie the inner knob is locked by holding outer flywheel and turning inner wheel away from you.

If you remove the needle plate and bobbin cover and turn the flywheel manually can you see the hook rotating at all?

If the needle is going up and down and the rotary hook is not rotating, then my guess will be that the pinon gear down in the free arm area has failed and will need to be replaced. You don't say what model but if it is a star series you should be able to remove the top plate on the free arm by undoing one screw and exposing this area to confirm this. If its a Stella or Lotus it won't be so easy to view. Either way, if its a Swiss made Elna parts are still available and there are serviceman around who can do this repair. If you are in the USA I would suggest you browse www.whitesewingcenter for parts/repair info on Swiss Elnas.

Or try www.sewingpartsonline.com and search by your model number to see the parts available.

YOu can down load a manual from here http://www.arizonaexpressionz.com/elna_instruction_manuals/Elna7000.pdf

Just remember to click the bobbin thread into the tension device correctly and hold the two threads behind the pressure foot when you start each seam - Elna top loading bobbins give great stitch quality but you just need to keep stray threads out or they'll jam up.

Also, you must use the Elna plastic bobbin that the manual specifies for this machine - the 5000, 7000 and 9000 were Elna Tavaro Switzerland's first foray into computerised machines and first released in 1986.

Also, please check the manual when you go to buy twin needles, there are two types now as computerised machines usually need the twin needles offset from the shaft position. They have red or black plastic block between the shaft and the twin needles - I think you need the red ones but just double check the manual to make sure. And you can't do all the wide stitches with a twin needle as it will strike the foot.

Hope this helps a little.

Check with a local sewing machine store and ask if they carry needles for industrial sewing machines.

These have a round shaft and may be what is needed.

that's a nice machine, one of the last mechanical Elnas with the discs for extra stitches. Firstly, you need to wind a bobbin, always use Elna swiss metal bobbins, with holes on one side only, slightly dished. Put on top of the bobbin spindle and take the thread from your spool on the spool holders at the back of the machine across to the tension disc on top left, its white bump, thread through the tension then back to the bobbin and pull the tail through a hole in the top of the bobbin. Flick bobbin across to the right against the stop, disengage the clutch by holding the outer flywheel and turning the inner towards you. Now press the foot pedal to start winding a bobbin, holding the thread tail so it starts off. Wind one full coverage of the bobbin so that the starting point is covered, then stop and cut the tail off with scissors. Now continue winding at 3/4 speed until bobbin is full, watch as it winds and give the thread a nudge with your finger so it fills top and bottom as well as in the middle of the bobbin. When it is full, the bobbin spindle will stop winding. Move it to the left, cut the thread and reennage the clutch by holding flywheel and turning the inner the other way. Now install the bobbin and click the thread into the tension device, see image.



Now thread up the top thread by taking the top thread from the spool, through the tension discs, across to the eyelet on top, down to the check spring, back up to the take up lever, then down to the needle catching the thread into the two thread guides enroute.
See this image.


Now thread through the needle front to back, hold the top thread, close the bobbin cover leaving the tail sticking out the top, lower the needle down by turning the flywheel towards you through one cycle and pull the top thread, drawing the bobbin thread up to the top of the needle plate with it. Pull both threads under the pressure foot to the back and your ready to go. Remember, top tension should be on 5 and bottom tension should be on the red 1, don't change it. Brush out the bobbin holder assembly each time you use this machine and add one drop of oil into the middle of the bobbin holder, there may be a red dot or just the indenation. Run the machine for 30 seconds after oiling without thread, slowly to spread the oil through the bobbin mechanism. Standard 130/704H needles, change regularly (6 hours of sewing) and pick right sized needle and type point for the work you are sewing. Good luck with your SU. If you wanted to join, there is a Yahoo group called "Elna Heirlooms" for fellow Swiss Elna owners.