Editing Juki Maintenance Notes

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Remove the small rubber cap on the top of the machine. Its about 6mm in diameter.
Remove the small rubber cap on the top of the machine. Its about 6mm in diameter.


Unscrew the three phillips head screws that hold the large, black face plate on the left side of the machine. They are the screws around the perimeter.
Unscrew the three phillips head screws that hold the large, black face plate on the left side of the machine.  


Once the needle bar mechanism is visible... Inside the faceplate, remove the black plate that covers the upper half of the needle bar. Remove the screw that holds the needle bar to the rotating crank arm mechanism that moves the bar up and down. Use the correct size driver for this last screw, its stiff and can be stripped if you use the incorrect size driver.
Once the needle bar mechanism is visible... Inside the faceplate, remove the black plate that covers the upper half of the needle bar. Remove the screw that holds the needle bar to rotating arm that moves the bar up and down. Use the correct size driver for this last screw, its stiff and can be stripped if you use the incorrect size driver.


The needle bar slides straight up and out of the top of the machine.  
The needle bar slides straight up and out of the top of the machine.  
Note that the needle bar has score marks several centimeters above the screw holes. They are visible if you enlarge the image on the right. These are for Needle to Bobbin Hook alignment described in page 6, section 18, of the Manual: [[Media:Juki-ddl-5550-6.pdf]]


Insert the new needle bar with the faceted side facing you and the set screw hole facing right of the sewing machine operator.
Insert the new needle bar with the faceted side facing you and the set screw hole facing right of the sewing machine operator.


Tighten the screw on the rotating crank arm mechanism. As noted two steps above, you will have to adjust the Needle to Hook relationship as described in the manual section 18.
Tighten the screw on the rotating arm. Replace the black plate. Replace the thread guides (Juki part numbers #229-06309 and #110-18801). Replace the needle (notch facing to the right of the operator). Replace the set screw that holds the needle. Replace the big black faceplate on the side of the machine and the three phillips screws that hold it on.
 
Replace the black plate.  
 
Replace the thread guides (Juki part numbers #229-06309 and #110-18801).  
 
Replace the needle (notch facing to the right of the operator).  
 
Replace the set screw that holds the needle.  
 
Replace the big black faceplate on the side of the machine and the three phillips screws that hold it on.


Its probably a good idea to change the sewing machine oil. This can be a very messy process if you overfill it. It will spill on the floor, so don't overfill it! Use new oil because used oil may contain a tiny amount of water which will eventually rust the mechanism.
Its probably a good idea to change the sewing machine oil. This can be a very messy process if you overfill it. It will spill on the floor, so don't overfill it! Use new oil because used oil may contain a tiny amount of water which will eventually rust the mechanism.
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