Is this a new machine or have you had the problem before
SOURCE: juki ddl-227 industrial machine
Before all else. Turn off machine!
(1) break screws on the hook loose.
(2) tighten one back up very skightly, one you can reach when the needle bar is at its lowest position.
(3) lower needle bar to its lowest position.
(4) loosen the screw just tightened.
(5) position the tip of the hook behind the needle hole. the tip should be as close to the needle hole as possible without actually touching the needle
(6) tighten screws
(7) slowly hand turn the machine (depress the foot pedal to disengage clutch brake on motor) several revolutions to make sure the needle doesn't hit anything on the hook.
(8) if it passes this test, try on a scrap of fabric
SOURCE: my Juki DL 5555 won't pick up bobbin thread
It is possible that you have the bobbin in backwards. Try inserting the bobbin so that the thread pulls in the opposite direction than it currently does. Also, sometimes you have to really push the bobbin case in to make sure it snaps into place. Other than that, you may have a dull needle...try replacing it, or it just may need an overhaul.
SOURCE: Filling the bobbin with my Juki DDL-5550-6
It's actually designed that way on purpose so you can wind a bobbin while sewing. If you lift the presser foot, at least it'll make less noise in the process.
SOURCE: I just bought a used juki DDL 8500 industrial
I just bought the same machine and mine came with a photocopied manual. There is indeed a bobbin winder on the side, there's a flat section on the side of the bobbin winder closest to you, if you push that forward it connects a wheel attached to a bobbin spoke, to the belt that runs between the machine and the motor. To wind the bobbin, put the bobbin on sideways onto the axis of the wheel that is on the inside of the machine, and push the bobbin winder forward.
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