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: threading juki DDL-227 machine
There is a free download threading diagram for the DDL-227 here:
http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Juki_Sewing_machine_threading/Juki_552_553_555_227_Threading_Diagram.htm
SOURCE: Juki Sewing machine DDL-555. After 4-5 hours use feed not moving
Sounds like as the machine builds up friction from extended use, some vital part is lacking lubrication and is seizing up. A good service person will remove ALL of the covers and thoroughly air clean and oil every moving part. Sometimes these dry points are hard to find and patience is required.
You can get a sewing machine oiler with a long applicator and put a drop of oil on anything that moves, but over oiling can be messy.
SOURCE: What needle type is used for the juki ddl 555?
Regular sewing machine needles. Choose the needle type and size according to the type fabric or thread being used.
http://www.euronotions.com/pdf/Schmetz_Sales_Guide.pdf
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