atlantis Report post Posted November 20, 2019 Hi I have an old Juki DLU-450-2 here, I know it's not a desirable walking foot but this is what I've got. The history of the machine is completely unknown and its problem is that it doesn't turn freely, I need to apply quite some force to make the handwheel turn. However I didn't turn it much, just a little back and forth to not break anything. It looks like the needle and feed dog were moving the way they're supposed to. Because the machine looks like it had been sitting a few years I first thought that it might be due to dried up oil but when I had a look inside it didn't look particularly gunked up but there was a lot of fluff around the machine everywhere. I cleaned out what I found and now rather think that something got stuck somewhere, either fluff or thread or something else, but I didn't spot anything so far. I think I need to somehow locate the spot where it is stuck in the first place, can someone advise on how to best do this? Regards Martin Quote Share this post Link to post Share on other sites
chrisash Report post Posted November 20, 2019 (edited) You can download the manual here www.supsew.com › download › Juki › Juki DDL-522-2 The 450 is on the same folder Edited November 20, 2019 by chrisash Quote Share this post Link to post Share on other sites
CowboyBob Report post Posted November 20, 2019 I would guess a piece of thread might of jammed up the hook,put some oil all the way around the hook then try rocking the handwheel back & forth. Quote Share this post Link to post Share on other sites
Gunnarsson Report post Posted November 20, 2019 Some heat from a hair dryer is a common trick to loosen sewing machines stuck due to dried up oil, so that and some fresh oil may be a good first step. If there's no change you just dig deeper, if there is change you are on to something. Quote Share this post Link to post Share on other sites
atlantis Report post Posted November 20, 2019 Thanks for these suggestions guys. I didn't have a hair dryer at hand today so I couldn't try that one. But I found some thread around the hook and removed it. After all I can turn the machine over now (by hand) and I think it's rather due to the large amount of spray oil I used in the process. However it still has too much resistance and adding more spray oil didn't seem to help more. What seems strange to me is that when I turn the hand wheel I feel every tooth of the pinions that drive the upright shaft. Well actually it's difficult to tell if it's the upper or lower pinions but my feeling tells me that the gears might be too tight somewhere. But how this would have happened I have no idea. I would have liked to separate the upper and lower drive train to tell if only the upper or lower part is not running smooth but I don't think this can be done without messing up all the timing. After all if there was a Juki specialist in my region I would take the machine and go see him, maybe it wouldn't be that a difficult problem for someone who knows these inside out, however there's none around anywhere, I was told there used to be one that closed down a few years ago... So please bear with me while we try to figure it out. Quote Share this post Link to post Share on other sites
atlantis Report post Posted December 1, 2019 The machine is on its way back! I loosened the pinion on the main shaft and moved it a little sideways to disengage it from the downward shaft. Then mysteriously neither the main shaft nor the lower part of the train were sticking. So I put the pinion back and the machine since turns fine. I will never know for sure what exactly it was; either the pinion was too tight or it was a coincidence. However because I have no reason to believe that this machine was messed with since taken out of service it is a mistery to me how this pinion could have been mounted too tight... Quote Share this post Link to post Share on other sites
atlantis Report post Posted December 1, 2019 Hi Can someone explain what exactly I should see in the oil sight window that my machine has on the front? As there's no oil bath inside it certainly isn't for checking the oil level but I expect that there should be oil splashing in a certain fashion but none of the manuals I have even mentions this sight hole. As I don't see anything but a very slight running of oil at max speed I somehow suspect my oil pump of not working correctly. How can these be tested and adjusted correctly? Regards Martin Quote Share this post Link to post Share on other sites
atlantis Report post Posted December 2, 2019 This last post of mine was meant to be a new thread, how come it ended up here instead and the thread title was also changed? And why can't I edit anything? Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted December 2, 2019 7 hours ago, atlantis said: This last post of mine was meant to be a new thread, how come it ended up here instead and the thread title was also changed? And why can't I edit anything? Since the posts were about the same machine, I merged them into one thread. Unfortunately, the title of one was lost and replaced with the one about oil. I can change the title for you, just tell me what you want it to say. Quote Share this post Link to post Share on other sites
