Juki lu 563 sound help

[kamo48399]

hello

recently I re-timed my Juki LU- 563 hook, after which the bobbin area began to make a grinding sound. Does anyone know what it might be? 

Here is a video of the sound:

IMG_1297.MOV

any help/advice would be appreciated.

[Wizcrafts]

Try listening as you handwheel the machine. It kind of sounds like gears are grinding from being too close together.

I might also be the opener arm pulling the shuttle all the way back with a hard stop. There must be a little clearance when the arm pulls the tab back.

[kamo48399]

Thank you for the advice Wizcrafts. The sounds still persist even with the case opener off so I might try fiddling with the gears more.

[friquant]

On 12/1/2025 at 12:37 PM, kamo48399 said:

the bobbin area began to make a grinding sound

I second Wiz' suggestion to turn the handwheel by hand for infestigation. If you can't isolate the cause, remove the timing belt. Then you can move the hand wheel (and arm shaft and needle bar) independently of the hook shaft. 

Also check if there is anything else contacting the face of those bevel/timing gears. On my Jianglong 341, the first time I moved the hook saddle to the left (to adjust hook to needle distance) left me with the bevel gears to rubbing on the feed dog eccentric. Once I also moved the feed dog eccentric to the left a bit, it was happy again.