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Drive belt How can I tension the drive belt on a Bernina 707?

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I have taken the side off but I don't know what the adjuster looks like and what do I do with it when I do know what it looks like? Thank you for trying to help. Linit

Posted on Jul 27, 2008

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My bernina 707 minimatic..isn't working!! My needle keeps getting seized an won't move up an down...Then when i try to sew it sews blanks....


Replace the needle.
Make sure the needle is inserted the right way. If the needle is installed the wrong direction the machine will get stuck.

Check and correct tension of the bobbin. (Guide attached)

Start the top tension at four and adjust as needed.

When threading do it with the pressure foot up so any snags can be felt. If there are snags they must be corrected. While threading, little tugs of the thread along the way will help. The snags can be felt this way.

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Aug 25, 2015 | Bernina Sewing Machines

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I have a Bernina 707 that is hesitating to sew from time to time. I turn the handwheel and it will start running again. I cleaned and oiled not sure what else can be done. Please help??


Be sure that you are using a good quality sewing machine oil (Bernina oil for mechanicals is great). Check the manual to be sure that you have oiled every spot noted in the manual. If you need a manual, you can download one here:

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&ved=0CCwQFjAE&url=https%3A%2F%2Fwww.bernina.com%2Fde%2FSupportData%2FOut-of-Print-de%2FBERNINA_707_717_manual&ei=hZuiVe7YBovhoAT0ppHADg&usg=AFQjCNHTAlgzOWgwVjNYj5JSuy1L3t9FhQ&bvm=bv.97653015,d.cGU&cad=rja

The belt could be slipping and need replacement. Sometimes the problem is in the foot control when the carbon brushes are wearing down. If you are handy, you can order them online and replace them yourself.

Jul 12, 2015 | Bernina Sewing Machines

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How do I change the motor drive belt on a Bernina 1030?


Adjustment: The stepped pulley support/frame has two 5mm fixing screws on the lower end of the frame and a plastic screw on the upper frame end. Early models had a third screw on the upper side of the frame. By loosening the screws slightly, push the stepped pulley and frame frame toward the loosened side and then let go,...tighten the screws. The frame tension spring is generally sufficient to adjust the belt tension. However, you may want to add a little tension but do not load too tight as you can cause stress on the motor or damage the front motor shaft bearing.
If a belt is needed, you can find them from local companies dealing in bearings, pulleys and drive components, i.e. Kaman Industrial etc. If memory serves me correctly the belt type is MXL, 250mm length, 5mm wide. The outer side of the belt has information to tell you the type. If you want to find one online go to www.sdp-si.com.
http://www.sewtechnical.com/

Apr 05, 2015 | Bernina Sewing Machines

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Change drive belt


Setting the belt tension on the 707-708-717 machines with the old rubber "Continental" belts:
1. Make sure that the hand-wheel spins freely on the main-shaft bushing stub when the release knob is loosened.
2. Assuming that you are using the original 441mm "Continental" rubber v-belts, the setting is made by means of loosening a 5mm Allen socket cap screw at the base of the step pulley support.
_____________
NOTE: The hand-wheel, stepped pulley, and motor pulley v-grooves must be clean. This is to say, that they cannot have any particulate or threads wrapped around the grooves.
4. The pulley will be automatically pre-tensioned to a 7 o'clock position by means of a spring to maintain the stepped pulley position. By pulling the belt toward this 7 o'clock position, the pulley tension can be adjusted and then tightened by means of the fixing screw.
_____________
5. It is important to know that both the upper and lower belt tensions can be independently adjusted so as to allow the hand-wheel to spin freely for bobbin winding without having the hand-wheel drive the machine. This is done by adjusting the step pulley support + or - radially, near the 7 o'clock position.
If the hand-wheel drives the machine with the upper belt loosened, then either the belt is too tight or the hand-wheel bushing and main-shaft stub need cleaning and lubrication.
Note: Lubrication was once the standard factory procedure with a class 68 oil, but experience dictates a dry lubrication with graphite. Silicone lubes are not recommended.
6. Do not over-tighten the 5mm Allen fixing screw as the 5mm threaded frame boss can be broken off.
================
Adjusting with the original Polyurethane v-belts on models 807-801-810-817-811 machines:
1. Follow the same procedure as mentioned but allow the step pulley's positioning spring provide the belt tension. Nothing more is required here.
NOTE: Sometimes these belts and pulleys get oily thus allowing much slippage. A simple cleaning of the belts and pulleys with mineral spirits can solve this problem.
================
After-market belts:
NOTE: One can find after market belts that serves to drive these machines but not without some problems as they are usually wider belts and don't fit the pulleys well. In this case some adjustment will be necessary.
SewTechnical Home

Mar 28, 2014 | Bernina Sewing Machines

1 Answer

Bernina minimatic 707 not sewing evenly


Sounds like it's not threaded properly and or you have tension problems. Re-thread with the presser foot UP. Sew a test seam. If you still get loops loosen the upper tension... a little at a time. Sew tests seam after each adjustment.

Sep 02, 2012 | Sewing Machines

1 Answer

My Bernina machine is 40 years old - a 707 minimatic but it is in perfect condition, regularly de-fluffed and oiled and had a new motor 4 years ago. A recent problem is with the tension. If I get the top...


You could try puchasing a replacement bobbin case, its possible that the tension spring on it has worn/stretched a bit. Try this website if you are in the USA - http://www.sewingpartsonline.com/bernina-707-sewing-machine-parts.aspx or just go to the bernina website and choose your country to find the head office in your country. They should be able to sell you the part or direct you to a local dealer closer to you.

Also clean out the top tension device if you haven't already. Turn to zero and floss between the discs. I use a clean selvage edge of a waste piece of cotton fabric or you could use dental floss or ribbon too, just something to get in there and remove any buildup. Thread, especailly darker colours, will shed dye particles and fibres and over time this can build up in the tension discs impairing their function.

Otherwise, sounds like you've had a really great run with your Bernina - if you don't already do this, then consider taking it for a service every two years too as the internals benefit from a lube on the older mechanical machines. It may be that the top tension device needs replacing to resolve your issue.

Jul 12, 2011 | Sewing Machines

1 Answer

Bernina 707 wheel is hard to turn


If the handwheel on your Bernina 707 is hard to turn, it most likely needs a good cleaning and oiling. Old oil dries and tends to get gummy, causing the moving parts to be stiff.

Oct 01, 2010 | Bernina Artista 180

5 Answers

I have a Bernina 707. I believe the motor just


Yes you can have the motor replaced. You need to take to a certified repair center though.

Jan 05, 2010 | Bernina Sewing Machines

1 Answer

1967 Bernina 707 Minimatic is not running freely


Have you been oiling the bearings per the guide? Try to isolate the upper mechanism versus the lower by rocking the handwheel and observing which causes the bind (take the bobbin and needle thread off to prevent jamming). You may have to remove some of the covers to see most of it. As long as no gearing becomes shifted or uncoupled, you should not cause trouble. Try taking the motor belt off to see if the motor itself may be binding. Good to see people keeping old, but still working machines running

Oct 24, 2009 | Sewing Machines

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