Try changing the needle
check for burrs in the bobbin area
check for burrs on the needle plate
try rethreading with a different spool of thread for the top & bobbin
SOURCE: Designer 1
Please, take this machine to an authorized technician before you attempt to set the timing on your own. An authorized technician will have a device to quickly tell you whether or not the timing is incorrect. If you change the timing yourself and that isn't your problem, you will spend far more money getting 2 problems fixed than the one original problem.
If the machine is making what I describe as a chattering sound, you may be able to clean the bobbin case and the ledge that it sets on and the problem will go away. This bobbin case should be operated with no lubrication. Some repairmen recommend " a drop of oil to make it run quieter". This generally makes it chatter louder. If there is any lube on the bottom of the black bobbin case, wipe it off and wipe the ledge that it rests on.
By the way, if the needle is hitting the raceway, you will be able to see the marks where it is hitting. In a Viking machine, this is normally caused by the "needle to hook clearance", not timing.
SOURCE: L-344 loose stiching
You need to do a tension assembly test.
Normal
0
MicrosoftInternetExplorer4
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Table Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-parent:"";
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin:0in;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Times New Roman";}
Tension assembly test. To do this test. Pull the thread
through the tension assembly and test it to make sure the tension is working
correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or
something in the middle. Raise the presser foot and pull the thread through the
tension. It should pull easily!! Lower the presser foot and pull the thread. It
should pull noticeably harder.)
If it doesn’t work this way then you probably have a piece
of thread or lint stuck inside the tension discs. To remove it, turn the
tension to 0 zero and raise the presser foot.Using a small screwdriver, open
the space between the discs and spray with canned or compressed air. The stuff
should come out. Do the tension test again to make sure you got everything and
then try sewing again.
sewman7
SOURCE: needle thread is missing the bobbin catcher
Suspect the lower drive mechanism is out of time with the upper drive. See your local service agency for repair.
Testimonial: "this gave me the exact info that I need to fix the problem thank you drallim. now I can just look at the machine diagram and make it happen. thank u"
should rotate clockwise as shown.insert on shuttle hook casing and close cover needle plate.next thread your upper 
threading tension as shown on red threading from spool pull threading and loop to dial tension threading and insert thread to lever needle and to needle hole tip. pull tread under the needle foot and feeder tooth.rotate hand wheel counter clockwise to hook up thread bobbibs and appear at top of needle plate,teo thread shoul appear,set dial tension to # 3 and stich to # 8 range to # 12 depend on fabric and layer of fabrics and set on straight stich sewing,let needle on upper position insert fabric for trial sewiing.put down foot needle lever. manually by hand rotate for assurance needle is free to sew if obtruction on loop bobbins thread occurs adjust all tension gradually then try again until free from sewing w/o problem star sewing.
29 views
Usually answered in minutes!
×