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. 

[kamo48399]

Thanks Friquant, I'm pretty sure the machine sews ok but the sound raises some concern as it only started after I re timed the hook. Also removing the timing belt is a good tip I wish I thought of when trying to find where the sound was coming from. I think it might be coming from the large timing gear and the small gear on the hook saddle although nothing I do seems to fix the sound (I've tried re timing and moving the big gear to mesh with the smaller one differently  a few times to see if that fixes anything but the sound still persists) but I will try messing with the feed dog eccentric as well. I only just got this machine a couple months ago and am pretty new to sewing in general so both you and  wizcrafts advice has been really helpful.

Edited 1 hour ago by kamo48399