Editing Juki Maintenance Notes

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Page 7, Section 20 of the manual has a lame description of this part of the machine. Manual: [[Media:Juki-ddl-5550-6.pdf]]
Page 7, Section 20 of the manual has a lame description of this part of the machine. Manual: [[Media:Juki-ddl-5550-6.pdf]]
[[Image:undertrimmer.jpg|thumb|right|Thread guide on left, movable knife top, stationary knife bottom.]]




* '''Buying'''
* '''Buying'''
I bought a pack of all three parts for $18 on eBay. They are Strong H brand and may not be as good as Juki brand parts, but so far (after one day) they are better than the dull knives we had. I searched ebay for Juki 5550-6. Its listed as an 'Undertrimmer Knife Set'. Original Juki parts would cost $38+tax and a trip to Apparel City (I couldn't find Juki brand parts online).
I bought a pack of all three parts for $18 on eBay. They are Strong H brand and may not be as good as Juki brand parts, but so far (after one day) they are better than the dull knives we had. Original juki parts would cost $38+tax and a trip to Apparel City (I couldn't find juki brand parts online).




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Caution! Unplug the machine!  
Caution! Unplug the machine!  


You need a #3 allen wrench and [https://www.noisebridge.net/wiki/File:Knifewrench.jpg this 1/4 wrench with a 4.5 flathead bit.] and a can of compressed air. The small flathead screwdriver used for needle changes (in the grey drawer beneath the Juki) is useful too.
You need a #3 allen wrench and [https://www.noisebridge.net/wiki/File:Knifewrench.jpg this wrench with a 4.5 flathead bit.] and a can of compressed air.


Remove needle plate.
Remove needle plate.
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The wrench pictured above makes it possible to loosen and tighten these small screws at the tough angle. I found the tools in the dirty shop in the top right drawer. The small wrench was in with the ratchets.
The wrench pictured above makes it possible to loosen and tighten these small screws at the tough angle. I found the tools in the dirty shop in the top right drawer. The small wrench was in with the ratchets.


Dab a drop of sewing machine oil on the moving knife with a cotton swab. (I'm not sure if this is needed. It may just attract dirt. Considering the abuse it takes, it's probably a good idea).
Dab a drop of sewing machine oil on the moving knife with a cotton swab. (I'm not sure if this is needed, it may just attract dirt, but considering the abuse it takes, it's probably a good idea).


Replace all three parts in the reverse order that you removed them. A dab of something sticky (I used solder rosin) on the needle replacement flathead screwdriver can keep the tiny screw captive as you replace it into it's hole.  
Replace all three parts in the reverse order that you removed them.  




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