Bilbrey09 Report post Posted June 23, 2020 (edited) I am having bottom tension issues on a couple of Juki DLN 9010A-SH...one brand new machine and another that is only about 8 months used. The issue is bad tension on the underside of the fabric only when the machine is doing a reverse stitch using either the reverse lever or the reverse button. Tension is great when sewing forward. Things that I have checked adjusted, re-adjusted, tweaked, changed you name it: Machine head properly threaded Brand new needle size 18, installed correctly Bobbin tension Burs on hook Needle & hook timing Check spring tension Presser foot tension Feed dog height and positioning Put new feed dog and needle plate on Tried different presser feet Measured forward and reverse stitch length which both came out equal Am I missing something or is there a problem much deeper in the machine? Edited June 23, 2020 by Bilbrey09 Quote Share this post Link to post Share on other sites
Gregg From Keystone Sewing Report post Posted June 24, 2020 As a test, sew slowly, then to a stop, and then go into reverse. See if that improves it. Often, on full function machines, the bobbin comes to an abrupt start and stop, and can over spin the bobbin. I would still check the timing. Usually when things are going well in forward but not in reverse, it's a timing issue. CLICK HERE FOR DLN-9010A Books Quote Share this post Link to post Share on other sites
PeteBuh Report post Posted June 25, 2020 Do your bobbins have anti-backlash springs? Quote Share this post Link to post Share on other sites
JJN Report post Posted June 25, 2020 It is weird that you have 2 machines with the same problem. What material are you sewing? How many layers? What kind and what weight of thread? What stitch length? Quote Share this post Link to post Share on other sites