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Hi,
I have run into this problem on newer light weight machines.
Remove the nose cover and look for thread wrap in the upper tension control, even a small piece of fluff can keep the discs from closing when you drop the presser foot.
Try not to disassemble the upper tension control because they can be tricky to get back together.
Check around the slack arm, thread will wrap-up at the pivot.
Good luck.
The waling foot sewing machine attachments I am familiar with don't exactly walk. They have a presser foot that glide over the cloth like every other presser foot. In addition they have feed dogs that work in unison with the feed dogs built in the machine. When the needle penetrates the material, the lower dogs drop and come forward and the upper dogs raise and come forward. As the needle exits the cloth,the lower dogs rise and pull the cloth while the upper dogs drop and pull the cloth. The arm on the attachment that operates the upper dogs rides on the screw that holds the needle. There is nothing to adjust.
This is common on older Pfaffs. The grease used in manufacturing has turned solid. It needs to be disassembled and re-lubricated.
Something a shop usually does.
The entire tension assembly will come out intact. There should be a screw (usually about 8-9 oclock) that holds the unit in place. Loosen it and pull assembly out. There will be another screw that holds the big round part (that was back in the machine before removing). Loosen and slide off, then remove and replace spring. Make sure when you install that its not in too far that it keeps your tension discs open all the time or you won't be able to adjust the tensions.
My brother machine has 2 screws that are under the carry handle, this removes the top piece of the casing and then you should be able to just tip the machine upside down to drop the screw out. Hope this helps.
Is it also hitting the needle plate? if so then you need to move the arm the adjustment is internal and you\'ll have to disassemble the clam shell case of the machine. May be best to have a pro fix it for you.
turn your bobbin over. check your manual for to be sure it is loaded correctly, (and bobbin tension is set correctly). Make sure the machine is threaded right. And if its an older machine...your not holding your mouth just right....(I have an OLD kenmore and more times then not, I'm not hlding my mouth just right.)
This machine has differential feed (top tension is different from bottom and fabric feed rate can be different from bottom). turn the dials for tension and feed rates to adjust. Adjust bottom tension to tighten bottom threads and possibly speed up bottom feed rate. Tough to say without more info.
Good luck and please rate me.
From White Sewing web site.
"Are wavy fabrics making you seasick? Do puckers leave a sour taste in your mouth? Then you need differential feed. It eliminates distortion and wavy seams when serging knits, plus it prevents puckers and pulled seams on lightweight fabrics. Turn the dial again for instant gathers.
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