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Message Board > Sewing Machines > I need help from those who repair machines, please ( Moderated by Sharon1952, EleanorSews)

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I need help from those who repair machines, please
Problems after installing new drive shaft bevel gear
DOGLOVER389
DOGLOVER389
Advanced Beginner
Member since 1/11/12
Posts: 170
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Date: 9/16/12 7:24 PM

Hi All,

I have a Singer Merritt 9612. I installed a new drive shaft bevel gear (also called the rotating hook gear) the other day. The original nylon gear failed.

Original Part # 422395

This machine was manufactured during a time of transition.

Replacement Part # (metal collar, nylon teeth, not 100% nylon) 103363, which is also 163997.

I confirmed the part number(s) with SewingPartsOnline.com before ordering.

The primary differences between the original gear and the replacement is the original was 100% nylon, with a small tab inside which fit into the slot on the end of the drive shaft. The replacement gear has a metal collar with a set screw and nylon teeth. The replacement part is much better quality than the original part.

The disassembly / assembly procedure was such that I did NOT readjust anything other than the hook to time it. I did not touch the needle height, feed dog timing, etc. To remove the original gear I removed the bevel gear which turns the hook, then loosened the set screws on the two drive shaft gears, removed the retaining ring behind the drive shaft spring washer and slid the drive shaft back far enough to remove the broken gear and install the new gear. I then slid the drive shaft forward, reinstalled the retaining ring, tightened the set screw on the bevel gear and tightened the set screws on the other gears.

After much trial and error, I got the hook positioned according to all of the timing instructions I can find. Admittedly, I do not have anything with which to measure the .5mm gap that is supposed to be between the hook and the needle. I had to try many times to get the hook where I wanted it so that the needle, whether the handwheel is turned forward or backwards, does not hit any part of the hook gear.

When there is NO material in the machine and the presser foot is down, the top thread is being caught by the hook and is going around the bobbin case without any problems. Whether the needle is in the center, left or right position, the top thread is being caught by the hook.

I broke the needle that had been in my machine the other night and after replacing the needle I could not sew. There were skipped stitches, if any at all.

I bought a package of Dritz ball point needles today (the only kind I could get other than "universal" and Schmetz were not available in ball point or "regular").

Again, with NO material under the presser foot, the top thread is being caught by the hook and is going around the bobbin case..

As soon as I put material under the presser foot, in this case two layers of 100% thin cotton flannel for pajamas, the top thread is not being caught by the hook.

Why?

The only thing I did with the presser foot was to remove the screw and the foot so I could see the position of the hook to time the machine. I did not do anything with the adjustment of the pressure on the presser foot.

According to all of the information I have read, the feed dogs are in the proper position (furthest from the needle) when the needle is in the lowest position. I did not touch the adjustment on the feed dogs. The only thing I did was unscrew and remove the feed dogs (leaving the part to which they attach untouched) so I could better see the hook. The material feeds without problems. But there aren't any stitches (perhaps a random stitch here and there, but for the most part, no stitches).

Can someone please tell me what is wrong?

Before the drive shaft bevel gear failed I did not have a problem with skipped or missing stitches. I am using the same thread that I did before the gear failed, in both the bobbin and the top thread.

The new gear seems to mesh nicely with the hook gear. There isn't any sticking, grabbing, chatter or vibration. I thoroughly lubricated the machine.

Thank you very much for your time and your assistance.




DogLover389

------
Cut my teeth on a Kenmore 117.58

http://pages.sewing-machine-manuals.com/173/PictPage/1922064294.html

Singer Merritt 9612

DreinPA
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DreinPA  Friend of PR
Intermediate
PA USA
Member since 4/5/06
Posts: 289
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In reply to DOGLOVER389 <<


Date: 9/16/12 8:24 PM

Its sounds like the needle. Ball points are not conducive to stitching on wovens. Universal would have been better. It is more "regular" than a true ball point.
I'm assuming you've put it in correctly and threaded properly.
I'm sure more voices will pipe up shortly.

------
Don't confuse accessibility with ease; just because anybody can pick up a needle and thread doesn't mean sewing quality garments is easy.

crankyoldlady
crankyoldlady
Intermediate
Member since 11/14/08
Posts: 166
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Date: 9/16/12 8:31 PM

If you don't find help here, you might check out the "wefixit" Yahoo group.

DOGLOVER389
DOGLOVER389
Advanced Beginner
Member since 1/11/12
Posts: 170
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Date: 9/16/12 8:50 PM

Hi,

The needle that was in my machine was a gold colored Singer 90/14 with a light blue band. WM, the closest store with a sewing department, only carries the Dritz and the Schmetz needles.

Even though I started sewing from the age of four, it wasn't until I found PR that I knew there were different types of needles, other than "regular" and "leather." We always used the same needle, until it broke.

I wasn't sure if I should get "universal" or "ball point" needles today, and there wasn't much in terms of variety. None of the needles had colors on them - they were all silver. I bought what I thought was best for testing the machine since the needles my friend's grandmother left behind are for an unknown purpose or machine. She got them while working in a sewing factory.

Should I try to find the exact needle (gold with light blue band) that was in the machine, or should any brand work? I have to travel over thirty miles round trip to get to Fabric Land, the only sewing store in this area.

I have never joined a Yahoo group. I have been hesitant to create an account because I don't want to be bombarded by Yahoo. If anyone can tell me how much or little email they recieve I would greatly appreciate it.

I hope this is a needle issue and not something mechanical. I just can't figure out why having material under the presser foot would make a difference.



Many thanx,



DogLover389

------
Cut my teeth on a Kenmore 117.58

http://pages.sewing-machine-manuals.com/173/PictPage/1922064294.html

Singer Merritt 9612

FW221circa1947
FW221circa1947
Beginner
Member since 7/29/12
Posts: 22
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In reply to DOGLOVER389 <<


Date: 9/16/12 9:46 PM

Hi Doglover, I am a member of several Yahoo Groups and if you join one, you can select to have all the daily posts sent to you in what they call the daily digest. That means you get an entire days worth of posts in one email instead of individual emails cluttering up your email inbox. I really like this option because all emails are in one neat email bundle.

crankyoldlady
crankyoldlady
Intermediate
Member since 11/14/08
Posts: 166
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Date: 9/16/12 9:48 PM

Have you tried sewing on a piece of paper? I often use a sheet of printer paper for testing.

crankyoldlady
crankyoldlady
Intermediate
Member since 11/14/08
Posts: 166
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In reply to FW221circa1947 <<


Date: 9/16/12 9:50 PM

Or you can set for no emails at all.

sew2006
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sew2006
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ON CANADA
Member since 6/24/06
Posts: 1950
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In reply to DOGLOVER389 <<


Date: 9/16/12 10:11 PM

Sounds like your needle bar timing has to be adjusted. When the gear broke the needle more than likely hit the hook resulting in missed stitches. For a Singer machine it would be best with a 2020 needle for woven fabric.

------
Janome10001, Babylock ESG3, Brother ULT 2001, White 634D serger, Pfaff 1472, Singer featherweight, Singer 14T957Dc, Bernina FunLock 009DCC coverlock, Brother PQ1500S, Janome CP900.

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