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Re: my Juki DL 5555 won't pick up bobbin thread
It is possible that you have the bobbin in backwards. Try inserting the bobbin so that the thread pulls in the opposite direction than it currently does. Also, sometimes you have to really push the bobbin case in to make sure it snaps into place. Other than that, you may have a dull needle...try replacing it, or it just may need an overhaul.
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According to the manual (pg 20), it appears the bobbin turns clockwise in the bobbin case. So when the bobbin is loaded and the thread pulled, the thread direction goes right, then doubles back through the tension mechanism to the left.
If you've properly installed a brand new needle that is correct for the machine, threaded it correctly, checked that the bobbin is installed correctly and the bobbin tension threaded properly, most likely the machine is out of time. In other words, the needle is arriving at the bobbin at the wrong time in order to intercept the bobbin. (You can open the bobbin area, hand rotate the handwheel and watch how and where the needle moves in relation to the bobbin to see where and why it is not connecting.) You can search the internet for web sites and videos that discuss machine timing or you can take it for service.
Make sure you are threaded correctly. Also be sure that your bobbin is sitting in the casing correctly. If the timing is right and the hook is catching, the thread may not be pulling through correctly. Clean your machine as well. Make sure your tension spring is clean and doesn't need to be tuned up.
first clean bobbin case loosen thread tension screw and clean under tension spring, hi pressure air is the best. its important to clean under tension part because material builds up and does not allow the flat spring to put the proper pressure on the bobbin thread. tighted tension (second screw) accordingly. all thread tension depends on thickness of goods being sewn. the heavier the good the more tension u need on top.
Most machines require that the bobbin in the case unspool in a certain direction its considered common knowledge I guess because it doesn't seem to be written in the text of manuals... but is indicated in the photos. make sure it's unspooling correctly.
Secondly. Please make sure you have the correct needle for your machine. Some machines do not use a 15x1 (most common needle) Let me show you. (see photo below) Clearly the 241x1 won't fit into your machine. BUT the 15x1 will go into the machine that requires the 20x1.... and the result is it won't pick up the bobbin thread.
Upper thread breaks
needle may be in backwards
Raise the needle bar to the highest point, then loosen the clamp screw to remove the old needle, place the new needle in the clamp with the flat side to the back of the machine
round needle--the groove in the needle should face away from the shaft.
Push the needle all the way up to the stop or as far as it will go, then tighten the needle clamp screw
upper tension may be to tight
the needle may be bent or damaged
thread may be hanging up in bobbin case--check area for loose threads or lint
It can be many things but first make sure the needle is in correctly, follow the manual to be sure, if it still does not pick up the bobbin thread you may want to bring it to a repairman to see if it is out of timing.