Well, you might just need a good oiling. Make sure the machine is not threaded and there are no thread snarls where the loopers interact. It also pays to insert new needles and observe the loopers and needles interact. they should come withn .01-.5mm of touching eachother; there should be no hard positive contact between loopers and needles. So, if its tight to turn over by had, this is usually a cam or bushing that need oiling, or thread that got sucked into the machine and is binding the thing up. What I would do is remove the covers, slip the motor belt off, turn over by hand. If it frees up, the bind is in the motor, if its still tight, then id look for thread, and oil the machine with a light weight oil (sew mach oil, tri-flow... NOT 3in1 oil!). If you have a keen eye, you can wiggle the handwheel and try to observe what parts are moving slightly, and which are not. using that method you may be able to track the bind to a section of the machine or even a specific shaft/cam/component of the machine. Another common bind point in sergers is where the knives mate. Move the top knife to its idle (non cuttin) position and see if this relieves the bind.
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:) welcome to the world of industrial machines. The good news is they are typically simple machines.
It is a good habit to take a few minutes to clean and oil your machine before you start sewing. Look for the oil points and give it one drop of quality sewing machine oil in each port.
Now let's try to determine why the hand wheel isn't turning. Loosen and remove the belt from the large reducer wheel under the table to the sewing machine. Try to turn the hand wheel. If it does turn.... Good! If it doesn't turn... we know the problem is in the the machine head and not the wheels below.
Make sure there is no bobbin thread or upper thread. Try to turn the hand wheel again. Anything?
Look carefully at the machine... is the take up lever bent? (personally had this happen with friends helped me move a big machine like this.)
Keep working this way... inspecting the machine until you find the problem. Good luck
I also have the Juki M)-655. Look at the power button; it should have 3 positions. First position turns the power switch Off, second position turns the power switch on and it will sew, third position turns on both the power switch and the sewing light. Several times I have thought I turned on the power switch to sew only to realize it was not in the second position. Hope this helps.
if its on and not running then its most likely a motor bearing or an incorrectly adjusted clutch ( large bolt on the right side of the motor ,from front of machine) loosen lock nut ( 17, or 19 mm) and adjust bolt until the noise goes away.
ordinary drop feeds are not suited for sewing leather,ideally a needle feed or machine with a walking foot mechanism is best suited.if you are stuck with this machine only,there are a couple of things which may help.on some of the juki ddls there is an adjusting screw and locknut on top and in the middle of the arm of the machine .turn needle by hand wheel to bdc and loosen this screw and turn clockwise slowley!
this will raise the presser foot very slightly,so when the feed dog is at tdc it can improve the feeding .
spear point needles are reccommended also.
one other idea,but you need a qualified mechanic to do this is to alter the feed timimg slightly on the eccentric on the top shaft.as the needle is entering the fabric,slow the timing down so the needle enters the leather just as the material starts to move.
hope this helps!
cheers kev w 07725903110
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