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How is the needle timing set on Pfaff 786 serger

Set screw on needle came loose - how is the timing set to position the needle correctly?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Pfaff serger stuck

your needle bar has been pushed up and is out of adjustment. You need to take off the side cover, there should be a screw on the back of your machine holding it on. Remove this screw, and remove the cover.You may have to remove the light assembly to reach the screw on the needle bar. Once you can see the needle bar, rotate the handwheel until you can see the screw on the needle bar. Loosen this screw SLIGHTLY until you can turn the needle bar. Hold and rotate the needle bar back and forth as you push down slightly. This will lower the bar.Lower it about 1/4 inch. Adjust the needles by turning the bar so that they are straight across. Tighten the needle bar screw so that the bar doesn't move. Turn the handwheel to see if the threads will be picked up. If not, adjust until they are. Tighten the needle bar screw tightly,reinstall the side cover ,and tighten the screw. Change your needles.Rethead and sew.
sewman7

Posted on Jun 17, 2008

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SOURCE: pfaff hobbylock serger 784 786

I cannot make a roll hem on my Pfaff 784

Posted on Sep 26, 2008

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SOURCE: I am looking for pfaff hobbylock 786 serger manual

ISBN 0-8019-8192-1(hc)? or ISBN 0-8019-8191-3(pb) by Naomi Baker & Tammy Young - "Know Your Pfaff Hobbylock" covers Pfaff Hobbylock: 797, 786, 784, 783 - Great book. This book is more helpful since it has detailed info pics in color- 182 pgs, @$3.00. Lists parts, projects, etc. The 786 manual has errors, 35 pgs. not detailed as the book above. Good luck! Fairlyart

Posted on Jul 19, 2009

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SOURCE: The shaft piece on my hobbylock 786 serger is loose

The top hex screw I think holds the bushing that allows it to slide freely. Keep that loose. If you open the panel where the lightbulb lives and spin the wheel, you will see a small flathead screw come into sight near the top of the rotation, through a small round window in the case. Tightening this screw a bit should keep the needleshaft moving with the wheel. Unfortunately I am still trying to find out how to position it so that it's properly timed.

Posted on Jan 06, 2011

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SOURCE: how do i tighten the needle holder on a pfaff 788 hobbylock serger

Hi,
I have the same problem, thee needle holder shaft swirls from left to right, is very loose. Maybe there is a screw missing, but which one? Please look at the pictures.
Ninchenx3_1_2013_11_30_56_am.jpg3_1_2013_11_31_14_am.jpg

Posted on Mar 01, 2013

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The bottom thread is real loopy. I have adjusted the top tension and it helps a bit but still to loose


Remove all the thread from your machine. Install a brand new needle. Raise the presser foot and re-thread the upper thread, making sure you are following the correct threading sequence. Confirm that the bobbin thread is threaded through the bobbincase properly. Now, perform another test stitch. Is the bobbin thread still looping?

If you have already tightened the upper thread tension and the bobbin tension is still too loose, then you may need to tighten the bobbin tension. First, mark with a permanent marker where the slash of the screw head meets the bobbin case. This will mark where the screw was originally set before you begin making adjustments and allows you to return the screw to that position should you need to.

Set the upper tension to the halfway point between the high & low number. This is what would normally be the standard.

Then gently turn the bobbin tension screw to the right 1/8th of a turn at a time. Then test. Keep adjusting until the bobbin thread tension is correct. The tensions are correct when the upper thread and the bobbin thread meet in the middle of the fabric.

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Nov 15, 2015 | Sewing Machines

1 Answer

PFAFF When I turn my wheel my need moves but my bobbin cage will not move. What can I do to fix this?


Hi it sounds like the set screw has become loose , if you take the Bobbin cover off that's the plate where the needle goes in on its down stroke, you will see what is called the Hook it is this that is not rotating this is actually quite difficult for a beginner to set in the correct position as the tip of the Hawk needs to pass within a cigarette paper thin distance from the scarf of the needle, this is the flat indentation on one side of the needle. At the back of the Hook you will see a small screw it is this that needs tightening but in the correct position when the needle is at its bottom stroke as I have explained above, the needle mechanism and the hook mechanism are all joined mechanically joined this must be the problem if it is not set correctly you will have a timing

Jul 06, 2014 | Sewing Machines

1 Answer

Needle assembly suddenly got out of alignment side to side


"Side to side"needle position as described, if I interpret you correctly, would be called lateral needle position at the widest stitch width setting. It would be highly unusual for this lateral needle position to come out of adjustment.
However, If you are describing the needle not being centered in the needle plate "front to back of the stitch slot, or favoring either the front or back of the stitch slot, an adjustment can be easily made using the following steps:
1. Locate the black 7mm hex head screw that affixes the head-frame at its base. This screw is located directly behind the presser bar. This screw fastens a small sheet metal angle that holds the head frame in its "front to back" location.
2. Loosen the screw.
3. With the needle lifted out of the stitch plate, gently push the head frame in the desired position so as to position the needle center in the stitch slot. (you will find some resistance here so a little more pressure may be needed).
4. Retighten the hex screw and voila'.
I hope that this was your problem.



SewTechnical Home

Jun 11, 2014 | Bernina 1008

1 Answer

Feed dog timing


It would be in the Service Manual for your machine. That is a common adjustment that technicians make quite often. It's usually a matter of loosening one or two Allen screws, adjusting to the correct position, and tightening the screws again. Sounds like over time, the screws in your machine have worked themselves loose.

Mar 05, 2014 | Singer 2662

1 Answer

How do i fix the timing on my pe770


Timing this machine is not so easy but if U want to try... Remove the left bottom panel (one central screw), and look under. U will see by the rear the vertical gear making the hook turn. At the bottom of this gear, U will see a small allen. Slack this allen screw, LEAVE A TENSION ON THE ALLEN SCREW: eitherway the hook will not follow the gear when U bring back the assembly to retight the allen screw.
U can now turn the hook on the gear, allowing to change the timming.

Send the needle completely down and when it come up, the point of the hook has to arrive at 2.5mm. on the top of the hole on the needle.

A TRICK : It might be easier to slighly change the position of the needle in the needle bar. Check the timing and try to correct it but lowering a little bit the needle before tightening the scew, or cut a little bit top part of the needle with a grinder.

May 09, 2012 | Brother PE770 Computerized Sewing Machine

1 Answer

Singer 758 adjustments for needle position and stich width


Found this below that may help confirm timing? As for the zig zag one thought is to check for end play in the upper shaft. At the left hand end of the shaft (under the top cover) there is an white plastic "bushing" with one slotted screw - this can be adjusted to take up the slack. It is possible that this bushing is split by the screw which may make it come out of adjustment. Check the other collars on this shaft are tight (hex) - by the belt and near the drive gear. P.S. double check the zig-zag cam is in the correct position (set to straight sew - centre position to install the cam - check instructions).

Timing
Turn the handwheel towards you until the needle is in the lowest position and observe two lines on the needle bar at the place where it comes out of the machine. You have to see these lines. When you find those, you have to tilt the machine on its back and you will see that on the right hand side there is a belt coming down onto a gear like piece on the timing shaft. Move your eyes to the left and the next thing that you will see is a large round gear on the feed shaft. Now that we have determined the difference between the feed shaft and the timing shaft, follow the feed shaft to the left and there will be a small metal piece there with two metal screws on it. Next to that to the left is a stationary metal peice that has a bump on it. You must see these two things to adjust your machine.

Now, to determine if your machine is out of time, turn the handwheel towards you (always turn it towards you) until the needle is in the lowest postion again. Observe the two lines on the needle bar, turn the handwheel toward you until the bottom line goes in the exact place where the top line was. Now look at the needle and hook. The hook should be directly behind the needle. If it is not, we go back to the bottom of the machine on the gear like metal piece that the belt rides on and loosen the two screws that are in the piece. Now if you will remember, this is on the timing shaft. When these two screws are loose, the hook will become moveable. Place the tip of the hook directly behind the needle without moving the needle bar (remember that the needle bars bottom line was placed where the top line was). When you have accomplished this, tighten the screws on the belt gear.

Now you have to determine whether the feed is in time. Again, place the needle in the lowest postion, rise the low line to where the top line was, and see if the line on the feed shaft is directly next to the bump on the stationary metal piece. If not, without moving the handwheel at all (because it must stay in this position to time it), loosen the two screws on the feed shaft piece and align the two lines together. Then tighten the two screws, make a few rotations with the handwheel, and again, put the needle in its lowest position and rise the bottom line to where the top line was. Inspect the two lines on the feed shaft and the hook behind the needle.

If these did not stay in adjustment, re-do the entire process, but be more careful not to move the handwheel when making the tightening adjustment. If you re-do this and it still does not stay in adjustment, you need to replace your timing belt,

Jan 01, 2009 | Sewing Machines

1 Answer

Singer 7442 - Needle hitting bottom


FIRST DETERMIN NEEDLE BAR POSITION TURN STITCH REGULATOR TO LARGEST STITCH, THEN TURN HAND WHEEL TIL' NEEDLE IS ABOUT TO ENTER NEEDLE PLATE.
AT THIS POINT THE FEED DOGS SHOULD BE JUST AT OR JUST UNDER PLATE. IF SO NEEDLE BAR IS, IN CORRECT POSITION,AND TIMING WILL BE SET AT THE HOOK.
TO SET TIME REMOVE NEEDLE PLATE TURN HAND WHEEL SO NEEDLE IS IN LOWEST POSITION. USING A SMALL RULE RAISE NEEDLE BAR 3/32 OF AN INCH ( OR 3 MM FOR A METRIC RULE) .HOOK POINT SHOULD BE IN CENTER OF NEEDLES WIDTH. LOOSEN THE 2 SHAFT SCREWS
SLIGHTLY,TURN HOOK TIL CENTER OF NEEDLE. TIGHTEN SCREWS. IF NEEDLE BAR IS OUT OF TIME. BRING HOOK TO CENTER OF NEEDLE AND LOOSEN SCREW IN LEFT COVER. RAISE OR LOWER NEEDLE BAR TO SET 3/32OF AN INCH. THE 3/32 MUST BE VERY VERY CLOSE.

Nov 26, 2007 | Singer 7442 Mechanical Sewing Machine

1 Answer

Needle hits?


OK, this is a general timing procedure. Loosen the screws on the main shaft gear that goes to the hook drive gear and separate the gears. Next put the needle in the left position and bring the needle all the way down by turning the handwheel. As the needle comes up make the point of the hook enter the scarf of the needle (just above the needle eye)and hold it there while you put the gears back togeather and tighten the screws. This should put it close to being in time. To fine tune it you can loosen the needle bar screw (half way up the bar that holds the needle) and adjust theneedle so the hooks point is just above the needle eye. You may have to do this a few times in order to stop it from skipping stitches. Good luck. Rick

Aug 26, 2007 | Singer 20U73

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