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Bernina 830 cam gear cracked

Nylon cam gear on Bernina 830 (old 830 not new) is cracked from center to circumference. machine seizes once per revolution of this gear until manually crank through the rough spot, then runs until rotates enough and seizes again. How do i replace the gear and how do i ensure i have the correct part? Also, while i'm "in there," should i replace anything else? i'm willing to invest in the machine, say new belts, replace any known problem parts, etc.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SewExpress
  • 41 Answers

SOURCE: My machine Bernina 830 does not run.

Hi Rose Mary,

I'm assuming you are talking about the original Bernina 830 (their newest machine is also an 830!)

If you've not had your machine professionally serviced in awhile, it could be as simple as a good, thorough cleaning and adjusting. Your machine should be professionally serviced about every 1-2 years....not a bargain service that blows out the dust and puts oil on the hook, but a service that checks all the gears for wear, adjustments, hook timing, feed timing, grease for the gears (if required), removes lint build-up deep in the machine - very thorough.

There are various gears in the 830 that control these functions. It sounds as if one of the gears may be either broken or jammed. Unfortunately, unless you are trained in machine repair, this isn't something you should attempt. When gears are replaced or adjusted, generally the timing of the machine must be reset as well.

We would recommend that you take your Bernina to your nearest authorized Bernina dealer (they'll be trained on your specific machine and have easy access to any parts that may be needed).

If you do not know a dealer in your area, you can search on the Bernina website.

The original Bernina 830 was one of the greatest models Bernina has made and is well worth putting the money into keeping it running. Great machine!

Hope this helps narrow down what may be happening.

Happy stitching,
Kim & Linnette
www.sewingexpressions.com

Posted on Nov 29, 2008

  • 52 Answers

SOURCE: bernina 830, worked fine until today... think it

there is a board inside the foot pedal that goes out sometimes you can check this by flipping the foot pedal upside down and at the top right there is a small hole where you can adjust the speed with a flat head screwdriver but be gentle it breaks easy, if its out you can take it to a bernina dealer and they might have a reapired one or they can send yours off for repair since that part is repair only

Posted on Jun 26, 2009

  • 13 Answers

SOURCE: old bernina 830 stitching problem: tight

Sounds like you need to adjust the tension. Probably a good idea to oil this older machine before you adjust. Also look for and clean out any lint or debris in bobbin case and around foot area.

Posted on Aug 29, 2009

  • 8 Answers

SOURCE: bernina 830 old style need replacment part -under extention table

The clamping yokes for Bernina sewing tables for models 830 and earlier models were hand fitted parts. Welding this may change the geometry so that the table may not fit at all. Additionally the material is diecast AL, not cast iron, and may or may not accept TIG welding applications.

Posted on Sep 06, 2009

  • 1 Answer

SOURCE: Bernina 707 Cam removal

take off the black metal bit that is above the pattern cam (4 screws). beneath you see 2 small screws, inside the metal frame, on each side of pattern cam. Take them out. Spin the pattern cam until you see one screw in the cam itself. Take that out too. Now you can push the splint out which holds the cam.

Posted on Sep 08, 2009

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After many hours of sewing on denim, the zigzag stopped working on Bernina Record 830


Have you been regularly cleaning and oiling your Bernina? Unless a gear is cracked or something else as serious, it could very well be that the machine has seized due to lack of appropriate lubrication.

Wheel on right side that controls the needle up and down is very tight...

Jun 23, 2017 | Bernina Sewing Machines

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I cant get my stitch Width Zig zag knob to turn om my bernina record 930. Any one have this problem?


Most likely because your machine has not been serviced (oiled & cleaned) in a long time and the old oil has turned to glue and seized. This is probably the most common problem with mechanical sewing machines. A mechanical sewing machine should be regularly maintained..ie every 40 hours of sewing use or at least every six months when not in use. You may want to take it to a Bernina service technician. Ask for a bottle of Bernina oil for CB hook machines and ask if they will show you how to oil it.

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Aug 14, 2016 | Bernina Sewing Machines

2 Answers

My Bernina minimatic 870 binds when trying to sew. It winds a bobbin well but labours when engaging the needle. I have tried to adjust the tent ion of the belts but that isn't it.


Have you tried to perform a thorough clean and oil on your machine. The cracked part could be hindering things, but if your machine has not been serviced in quite a while, the old oil has most likely hardened and is preventing things from moving freely. Use ONLY fresh, good quality sewing machine oil--Bernina oil or Tri-Flow Synthetic Oil would both work well.

You'll need to open the top and left side above the needle (and the free arm cover (or if it is a flatbed, you'll eventually lay it on its back so you can access the mechanisms underneath). Slowly rotate the handwheel toward you, watch where metal parts rub other metal parts and apply a couple drops of oil. You can look for oil ports, but sometimes they are difficult to locate. Be sure to also move the levers & dials and oil those as well. Do Not oil metal cams, nylon gears, rubber, or belts. Also, oil the needlebar where it moves up and down (including the knuckles on the take-up lever), the presser foot lifter, and get the moving joints in the free arm, ie feed dog mechanism (there's usually a very important oil port right behind the feed dogs next to the case) and don't forget the feed-dog switch mechanism.

To speed things up, you can direct hot air from a handheld hairdryer into the internal mechanisms to get things moving quicker.

This is a diagram for an 830 Record, but it should be somewhat similar to your Minimatic. (Note, there may even be an oil port on or near the motor.)

bernina-minimatic-870-binds-when-trying-pfwt3hacos4jb0fjnjzp0a5y-2-0.jpg

The cracked gear may eventually give out. However, there are service personnel who are able to replace them. Sometimes parts may be difficult to find for these older machines, but there seem to be several places that still carry the nylon gears.

...

Jul 01, 2016 | Bernina Sewing Machines

1 Answer

My Bernina 830 will not switch stitches. It says the number but shows straight stitch and sews straight stitch


Is it a new 830 computerized model or the older 830 Record mechanical?

If it is the 830 Record, it needs oiling--1-2 drops of good quality sewing machine oil (specifically concentrate on the stitch selector lever and oil the metal parts that move against other metal parts) Do NOT oil the cams, plastic gears, any rubber parts, ie belts, bobbin winder wheel.
Bernina 530 through 830 Record Oiling Diagram

Oct 19, 2015 | Bernina Sewing Machines

2 Answers

How do I unjam the gears in my bernina 830?


If this is a Bernina 830 Record and the handwheel is stiff or does not turn, about 98% of the time the machine needs oil. Another problem could be a cracked or broken gear (one or both of the white plastic gears in the top but unless you are very handy, your Bernina tech should probably take care of this repair.)

Mechanical machines need to be oiled regularly just like your car. If the machine sets in storage for a while or is used often but not oiled or cleaned regularly, the oil that exists in the machine will eventually thicken and acts like glue. (Sometimes you can see a dirty-looking dark gold or brownish goop which is usually old oil.) Then your machine is frozen.

There are quite a few oil holes (both in the top and bottom of a Bernina mechanical) that require periodic oiling (see your machine Manual). If the handwheel is frozen, buy a bottle of liquid Tri-Flow Synthentic Oil (from the hardware store) and put one or two drops in all the spots shown in the manual. (DO NOT oil the two white plastic gears or the metal CAMs!!! NEVER use 3-in-1 oil, cooking oil, WD-40, or a generic sewing machine oil from the fabric store. And do not put more than one or two drops of oil at a time as over-oiling will also damage your machine.)

Then, using your hand-held hair dryer, direct hot air into the internal part of the machine (top and bottom). The metal may become very warm to the touch. Then try to gently move the handwheel. Repeat. Even letting it set overnight may help.

Once the handwheel loosens, slowly hand-rotate the handwheel and watch where metal parts move against each other, put a drop of oil in each of those. Be sure to move the selector knobs and oil where metal moves against metal to keep those working.

To maintain your machine, a good recommendation is to oil every time the bobbin thread is changed, every 8 hours of constant sewing, or every six months if the machine is not in use. Use a good quality oil, ie Bernina oil for "mechanical" machines. When oiling, also be sure to brush out the dust and lint (especially around the feed dogs and bobbin works).

If the oil in your tube looks dark colored, throw it out and get some new. I've run across some old sewing machine oil in the can that looked like dark honey and stunk to high heaven. Get rid of it!

Treat your machine well and it will serve you well for many years.

Jan 04, 2015 | Bernina Sewing Machines

1 Answer

Supply of new stitch cog for Bernina 830 Record


I don't know what a stitch cog is by your definition but I suspect that you may be referring to the cam stack worm gear, part # 310 007 03. These gears are available, however those produced and sold as after market parts online have ranged from bad to very bad. I would suggest that you find an OEM part (not a reproduction) that are still available from time to time on EBAY etc.
Changing the gear is not as straight forward as it may look. The proper replacement requires: 1. removal of the cam stack without damaging the machine parts, 2. removal and installation of the new gear with the correct alignment of the individual cams, 3. installation of the cam stack and pattern indicator without axial play, 4. correct parabola timing of the main-shaft worm wheel and cam stack gear, 5. synchronization of the zigzag and automatic cam parabolas, 6. pattern indicator timing, 7. checking and adjusting the automatic needle position. SewTechnical Home

Jun 14, 2014 | Bernina Sewing Machines

1 Answer

Find a gear part to repair my Bernett 334d


Has the horizontal shaft gear (white nylon gear) inside your overlocker failed? Does it look like this?
http://www.sewingpartsonline.com/horizontal-shaft-gear-bernina-bernette-50141103.aspx

My repair man obtained this part from Bernina and was able to repair this although it is a labour intensive repair requiring pulling down the whole machine to do. But the part itself was only $US38.

You can buy from sewingpartsonline as per link above.

Or you could ring Bernina head office in your country and talk to someone about it as I was initially told my machine was unrepairable as this part was not available by a local store who wanted to sell me a new one. I guess in light of the 4-5 hour repair time, this is probably a valid call if you buy a new plastic serger but I love my Bernette and felt it was worth repairing, not junking it. It is now 5 years later and still going strong since that repair. My OSMG (old sewing machine guy) Ken told me that the nylon gears sometimes will just crack, even if the machine hasn't had lots of work, just plastic ageing.

Hope this helps you - please rate me 4 thumbs up if so. Cheers

Jun 22, 2011 | Bernina Sewing Machines

1 Answer

Sewing Machine Problem


Check to see if the cam stack gear does not have a crack in it. The other problem is the cam engager lever is does not engage the cam stitches because it is gummy. To solve this, lift the lid and follow the lever to where it make contact, add a penetrant oil. More the lever back and forth as fast as you can and work the penetrating oil into the area. It should click back and forth and snap between the back and front V's. One is for the zig zag and straight stitches and the other is for all cam patterns. Once it is clicking and snapping back add regular oil. Thensew out your pattern stitches. If the machine binds then you could have a cracked cam stack gear and has to be change by a Bernina service center.
SewTechnologist

Apr 18, 2008 | Bernina Activa 130

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