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Bernna bernette serger

How to replace upper blade

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Re: bernna bernette serger

The gearin my serger broke and i cant get the gear

Posted on Jun 24, 2008

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The upper looper on my Bernette 334Ds overlocker will not move backwoods and forward hence no loops or stitches being made. How do I fix this?

Has it been professionally cleaned and oiled recently? Even though the manuals usually don't provide instructions for oiling the inside of a serger, they do need it periodically because of all the moving parts. If you don't feel comfortable doing it yourself, then maybe a trip to the Bernina technician is in order. (Please if you try it yourself, be sure you have the proper oil, preferably Bernina serger oil--not Bernina sewing machine oil.)

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I am missing an accessory for my bernette 334ds serger

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to replace the upper cutting blade the front panel
2.remove the screw holding the upper blade
remove the upper blade
3.position the new blade in the blade slot, replace the you tighten the screw, hold the blade up in it's highest position
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hope this helps you
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I have a Bernette 335ds serger and one of the needles fell out (plus I need to take the second needle out. The thread has broken in that needle a dozen times, also. I can't find my manual, and don't...

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 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.

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Blades will not cut

A few things to check here; 1. do the blades cross over each other when the upper blade is fully down - if not make sure lower blade is flush with top of needle plate and then loosen upper blade and set it so that the blades cross over for the full length of the blade when down. 2. is there any lint or thread caught between the blades - push the upper blade to the right and look between the blades and remove any material caught between them. 3. are the blades damaged - blades can become chipped from sewing over pins etc and also become dull after considerable use (replace if damaged).

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