I can't Insert a new needle - Sewing Machines

maybe there's something happened when you removed the previous needle or the needle clamp is already loose

Take the screw out. Using onld needle, Clean out where the needle goes (old neede broke off up inside needle holder? )

is it the right needle for the fabric being sewed?
you said you put in a new needle and as you tighen the screw
the needle moves to the left,, it's a possibility that the needle holder or
needle bar need to be checked because the needle should stay straight
and not move to the left unless your changing the needle position.
could the top thread be caught somewhere, like the spindle the spool
set on, I've had that happen, if possible take a can of air and blow the
tension disks just incase there is any lint in them.

Remove bobbin, presser foot, needle. Tip machine back on towel gently. Unscrew plate--don't lose screws! Do not service in presence of children and curious pets. Put foot pedal next to you on tabletop. Use Zoom Sewing Machine oil. Any part MOVING that are NOT gears get one drop oil. Any DRY ONLY gears get dab of Singer sewing machine lubricant. Replace screws. Secure screws. Open left front compartment & one drop oil @ top of needle bar. Open race shuttle (where bobbin case fits in). One-half drop oil of on oscillating hook (bottom left - hand corner...smear that oil around! Insert NEW needle all way UP in needle bar groove, flat needle shank toward back. Turn handwheel towards you and raise. Raise presser foot so that threading locates all tension slots a's you pull thread TAUT from spool to each tension slot and left to right through silver, metal take-up lever, and down to tension bracket, pass needle, then pull 6" thread towards you and thread from FRONT to BACK of needle. Place bobbin into case and "thread" it. Set presser foot on DOWN position. Turn handwh towards you, dipping needle into needle plate. Make loop with bobbin thread, pull towards you. Place a good 7" underneath presser foot (both threads). Let machine RUN on 24" scrap to distrubute oil/lube. That's it! Jimmy

Don't worry! I'll try my best to help out here. Problem is most likely in bobbin area. Remove bobbin, clean with brush to remove any threads caught in tension discs. Brush the feed dogs (teeth area under your needle plate).Rethread with presser foot in UP position so thread can locate tension slots. I recommend new needle and remember to push it up into needle bar shaft flat side back a's far a's it will go. Tighten needle clamp screw. That press foot must stay raised now while you insert needle And thread it. Tension: Set at 4. Just a very short turn of tension if 4 is not giving desired results. I hope this helps. It's probably very frustrating, I understand, but I know you can remedy this easily. Follow above steps SLOWLY! Jimmy

I don't think it's a major timing issue, so don't panic. Take a look at your selected stitch pattern selector and set for straight stitch, and set Tension at 3-4. Width: 4. Length: 4. Make sure presser foot Down when you rethread machine so the tesion disks open up to locate thread. Always hold thread taut when "feeling" for tension slot. Insert new needle. Needle goes all the way up into needle clamp as far as it can possibly go, FLAT side needle toward needle bar and more rounded side needle facing you. Leave 6" tail. Hold thread toward you as you turn hand wheel toward you so needle can make a loop with bobbin thread. Make sure bobbin thread isn't hanging down on or across bobbin! Make sure thread in bobbin has wound evenly - good quality thread ideal! Clean bobbin area and feed dogs for broken, loose threads and lint. Always use needles appropriate size for weight of fabric. I suggest walking away from machine, taking deep, cleansing breadth, humming a favorite tune, then doing above and see how it goes! Soon your machine will be humming happily along with you. Hope these suggestions help. Jimmy

Needles are normally inserted with the flat side of the top part facing away from you. I've yet to see a machine that it isn't inserted that way in 30+ years of sewing. If, for some reason, the machine doesn't sew or isn't sewing well with the needle inserted that way, you can always flip it around and try the other way. But start this way first. I'm certain it'll be the correct way on your machine as it is on every machine I've ever come across.

If you are asking if you should change the needle, yes. My experience is that a dull needle will cause problems long before it breaks. If you are asking how to change the needle, then: first raise and then remove the foot (not really necessary but makes it easier) If possible do not remove the screw that secures the foot. Next loosen the small screw that secures the old/broken needle in place. Remove the old/broken needle, paying close attention to the needle's alignment (which direction is the flat side of the shaft facing) Insert the new needle with the same alignment as the old needle. Tighten the small securing screw, replace the foot and tighten the screw that holds it in place. Rotate the machine by hand to insure that the new needle does not strike or rub against anything during it's full cycle. Sometimes a broken needle will indicate a timing problem or a incorrectly installed bobbin holder. Re-thread the machine and check for proper operation.

NEEDLE TROUBLESHOOTING:

Is in backwards, Needle mantra is "insert needle with the flat shank to the back of the machine". Needles have a scarf (cut out) at the back where the hook swings through and catches the thread, if it isn't facing the right way, then the thread can't be caught by the hook.
Is it fully up into the needle housing?
Is it the right needle for the machine. Most domestic machines take the standard 705/130H system needle.
Is it bent, blunt or burred, always start each job with a new needle from the packet, choosing the right sized needle for the fabric weight, and sharp for wovens, or ballpoint for knits.

Good needle chart, threading and machine cleaning info at www.sewing.about.com if you don't have a manual.

If you have tried all these things and still no joy, then it is possible that the machine timing has been knocked out, ie the sequence between needle at it's lowest point and when the rotary hook swings around and catches the thread from the back of the needle. But try the above first and I hope it resolves your problem. Timing is best left to a trained technician.

I have a Bernette 334D serger - I'll make a guess that your 335DS is similar.
There is a manual for your model for sale on www.ebay.com right now, item number is 150565998515.

Assuming your needle assembly is the same as mine, you switch off the engine, turn the flywheel until needles are at the highest point, then take the green small straight blade screwdriver from your machine kit and use it to unscrew (righty tightly, lefty loosey) the needle screws a little (never unscrew all the way out!!!) so you can remove the needles. I use my tweezers for this job as it makes holding the needles easier. You may also want to unclip the pressure foot and raise the upper blade out of the way for a bit more room.

Then slide a new needle into each holder, flat shank to the back and tighten up the needle screws again. Remember that the two needles sit at different heights from eachother so make sure each goes fully up into the needle seat, then retighten with the screwdriver.

I hope this helps you with your Bernette, I've had my 334D since 1990 and its still going strong.