Juki Maintenance Notes - Revision history

73.202.95.43: /* Counter Knife */

2024-01-01T00:25:09Z

Counter Knife

← Older revision		Revision as of 17:25, 31 December 2023
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	* '''Description'''		* '''Description'''
	The Juki 5550-6 has a stationary knife, a moving knife, and a thread guide. If they get dull, you will find that the thread does not cut and a rat's nest can build up in the needle plate. The stationary knife may be resharpened once, but I don't think we have a sharpening stone. Its easiest to replace all three at once. I found our thread guide was broken too. If sewing heavy thread, the knife will only last 3 months. It takes under an hour to replace these parts. Keep the knife area clean by removing the needle plate and ~~blowing compressed air on~~ the knives. This helps a lot.		The Juki 5550-6 has a stationary knife, a moving knife, and a thread guide. If they get dull, you will find that the thread does not cut and a rat's nest can build up in the needle plate. The stationary knife may be resharpened once, but I don't think we have a sharpening stone. Its easiest to replace all three at once. I found our thread guide was broken too. If sewing heavy thread, the knife will only last 3 months. It takes under an hour to replace these parts. Keep the knife area clean by removing the needle plate and using the cleaning brush to remove lint, fuzzy or dirt from the knives. If there is a large amount, use the vacuum. This helps a lot.

	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]]
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	Remove needle plate.		Remove needle plate.

	Clean the area with ~~compressed air (use air compressor in~~ the ~~dirty shop if there is no canned air)~~.		Clean the area with the cleaning brush or a vacuum.

	Note current adjustment position of the stationary knife... This is how we probably want the new one installed.		Note current adjustment position of the stationary knife... This is how we probably want the new one installed.
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	* '''Last Replaced''' (log replacement date here)		* '''Last Replaced''' (log replacement date here)
	May 1, 2011 - Chris Murphy		May 1, 2011 - Chris Murphy


	== Needle Bar ==		== Needle Bar ==

Murph: /* Needle Bar */ more detail

2013-06-23T18:38:54Z

Needle Bar: more detail

← Older revision		Revision as of 11:38, 23 June 2013
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	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 arm. 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 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.

	Replace the black plate.		Replace the black plate.

Murph: /* Needle Bar */ more detail.

2013-06-23T18:37:37Z

Needle Bar: more detail.

← Older revision		Revision as of 11:37, 23 June 2013
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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 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. They are the screws around the perimeter.

	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.		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.

	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.

Murph: Added Needle to Hook Relationship notes

2013-06-23T05:12:34Z

Added Needle to Hook Relationship notes

← Older revision		Revision as of 22:12, 22 June 2013
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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.		Unscrew the three phillips head screws that hold large, black face plate on the left side of the machine. They are the screws around the perimeter.

	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.		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 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.		Tighten the screw on the rotating arm. As noted two steps above, you will have to adjust the Needle to Hook relationship as described in the manual section 18.

			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.

Murph: /* Needle Bar */ typo

2013-06-23T04:51:27Z

Needle Bar: typo

← Older revision		Revision as of 21:51, 22 June 2013
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	* '''Description'''		* '''Description'''
	The Juki 5550-6 has a polished rod that holds the needle with a set screw. The hole that holds the set screw that holds the needle got stripped and then someone made some improvisations instead of fixing the problem ~~buy~~ ordering and replacing the part. That wasn't good because we lost the thread guides in the process.		The Juki 5550-6 has a polished rod that holds the needle with a set screw. The hole that holds the set screw that holds the needle got stripped and then someone made some improvisations instead of fixing the problem by ordering and replacing the part. That wasn't good because we lost the thread guides in the process.

	[[Image:Needle_Bar.JPG\|thumb\|right\|Needle Bar part #22906002]]		[[Image:Needle_Bar.JPG\|thumb\|right\|Needle Bar part #22906002]]

Murph: Added images

2013-06-23T04:49:42Z

Added images

← Older revision		Revision as of 21:49, 22 June 2013
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	* '''Description'''		* '''Description'''
	The Juki 5550-6 has a polished rod that holds the needle with a set screw. The hole that holds the set screw that holds the needle got stripped and then someone made some improvisations instead of fixing the problem buy ordering and replacing the part. That wasn't good because we lost the thread guides in the process.		The Juki 5550-6 has a polished rod that holds the needle with a set screw. The hole that holds the set screw that holds the needle got stripped and then someone made some improvisations instead of fixing the problem buy ordering and replacing the part. That wasn't good because we lost the thread guides in the process.

			[[Image:Needle_Bar.JPG\|thumb\|right\|Needle Bar part #22906002]]
			[[Image:Needle_Bar_Thread_Guide_Juki_229-20805.jpg‎\|thumb\|right\|Needle Bar Thread Guide part #229-20805 or alternative part number #110-18801]]
			[[Image:Needle_Bar_Thread_Guide_Juki_229-06309.jpg\|thumb\|right\|Needle Bar Thread Guide part #229-06309]]


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	You need a large-ish phillips screw driver and several medium and small slotted screw drivers. You also need an egg carton or tray to hold the various parts.		You need a large-ish phillips screw driver and several medium and small slotted screw drivers. You also need an egg carton or tray to hold the various parts.

	Remove the needle, the set screw that holds the needle, and the thread guides (Juki part numbers #229-06309 and #110-18801)		Remove the needle, the set screw that holds the needle, and the thread guides (Juki part numbers #229-06309 and #229-20805 or alternative part number #110-18801)

	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.
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	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.


	* '''Last Replaced''' (log replacement date here)		* '''Last Replaced''' (log replacement date here)
	June 21, 2013 - Chris Murphy		June 21, 2013 - Chris Murphy

Murph: /* Needle Bar */ Added some details

2013-06-23T04:32:46Z

Needle Bar: Added some details

← Older revision		Revision as of 21:32, 22 June 2013
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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 large, black face plate on the left side of the machine.		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 rotating arm that moves the bar up and down.		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.
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	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 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.		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.

	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.

Murph: Added new section for the Needle Bar replacement

2013-06-23T04:24:32Z

Added new section for the Needle Bar replacement

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 == Counter Knife ==
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 * '''Last Replaced''' (log replacement date here)
 May 1, 2011 - Chris Murphy

Murph: /* Counter Knife */

2011-05-03T03:30:35Z

Counter Knife

← Older revision		Revision as of 20:30, 2 May 2011
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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 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 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.

	Remove needle plate.		Remove needle plate.

Murph: /* Counter Knife */ Rosin tip

2011-05-03T00:31:01Z

Counter Knife: Rosin tip

← Older revision		Revision as of 17:31, 2 May 2011
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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 wrench with a 4.5 flathead bit.] and a can of compressed air.		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. The small flathead screwdriver used for needle changes (in the grey drawer beneath the Juki) is useful too.

	Remove needle plate.		Remove needle plate.
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	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. Considering the abuse it takes, it's probably a good idea).

	Replace all three parts in the reverse order that you removed them.		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.


	* '''Last Replaced''' (log replacement date here)		* '''Last Replaced''' (log replacement date here)
	May 1, 2011 - Chris Murphy		May 1, 2011 - Chris Murphy