Juki HZL F-Series Sewing Machine User Manual
This is a machine I own and use daily. I believe what the local dealer says about this machine needing several hours on it when new to “break it in,” as I had tension issues for the first week or two. Since then it’s been dreamy. I do have a problem though, and maybe someone else will chime in with a similar issue (though I’ll probably have it professionally fixed by then). When rolling along I get a loud buzzing sound issuing from the bobbin shuttle, which vibrates intensely at anything above a medium speed (when machine is set at full speed). I may have damaged the