Adjusting timing · Fitting a timing belt · Vertical rotary hook

Timing and motor belts for a T132

Quite a few of us have a T132 sewing machine known under many names such as Lada, Cresta, Minerva, Sewmaster, etc. It is a very nice rotary free arm machine from late 1950s and 1960s. All steel parts except two belts: a timing belt connecting the upper and lower mechanism, and the motor belt. 

Timing belt

The original belt has a very odd pitch (7.52mm, 2.2mm high trapezoid teeth, 50 teeth), and is extinct in the wild, so if your beloved T132 just had her belt snap, you were left with hunting down another T132 and scavenging her belt. 

But not anymore! I have located and tested a replacement belt readily available: HTD 376-8M-10 (376mm long, 8mm pitch, 10mm wide, 47 teeth). Not the same pitch but still works due to this belt being thicker. 

Motor belt

The motor belt is unusually short. It is a V-belt that is 5mm wide, 3mm deep, with a 190mm inner circumference.

Where to buy the belts

These belts are available from www.bearingsrus.com or www.bearingsrus.co.uk. The belts are not standard, so they don’t have them on the website, but if you drop them an email, they’ll supply both belts upon request. The belts are cheap and they even do multiple item discount starting already with two belts! (There are also other suppliers in the USA, but shipping to Europe is prohibitively expensive, and BearingsRus was the only one I found this side of Atlantic who did not charge me £20 per belt, but just £6.60, as it should be).

Fitting the timing belt

To fit the belt, remove the balance wheel by pulling it off – there’s a pretty strong spring, so pull hard. Under it, you have the top gear. 


Remove the side motor cover, and behind the motor pulley you see the bottom gear. 

Getting the new belt around the two gears is a pain, but can be done with perseverance. 

I find it helps to soak the belt in hot water to soften it, as well as to remove the large motor pulley. Remember to put it back before continuing, though. See further down in this post for tips on fitting the motor belt.

Setting the timing

Once the belt is on, you need to set the timing which is tedious and also requires perseverance. 

Remove the foot and insert a needle. Set the needle left. 

Loosen the two positioning screws on the top gear. 

Rotate the bobbin winder so that the hook is in the top position and the feed dogs are in the bottom position (the hook makes two revolutions for each stitch). Then rotate the shaft of the upper mechanism counter-clockwise until the needle reaches the lowest point and starts going up. The correct position is when the tip of the hook is aligned with the right side of the needle 1mm above the eye, with the needle in the left position.

Fix the positioning screws on the top gear and try some sewing. You are nearly there, but you will need to fine-tune the position for your machine, with perseverance. 🙂 

Repeat the following: loosen one positioning screw on the top gear, rotate the shaft very slightly, tighten the screw, try sewing. Be sure to check straight stitch with the needle positioned left, centre and right, when all three work, zig-zag will work too. 

Re-assembling

Remember to tighten both screws on the top gear. Then push the balance wheel back onto the shaft. The pin on the wheel goes into the hole on the gear.

Fitting and adjusting the motor belt

The motor belt can be quite easily pried off the larger pulley and also put back on. Fit the belt around the small motor pulley, then starting from the bottom, fit the belt into the groove of the large pulley as far as it will go. Rotate the motor pulley clockwise and help the belt get onto the large pulley.


Once on, the belt needs tightening. The tension should balance the tension of the timing belt so that there is no slipping. The new timing belt fits tighter than the original, so the motor belt needs tightening too. This is done by adjusting the position of the motor. It is mounted on the base plate with three large moveable screws accessible from underneath.​

Final words

I have just resurrected one T132 that was missing its timing belt. It works, and I have so far not found any problems with the replacement belt. So I can offer you this solution with some degree of confidence.

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3 thoughts on “Timing and motor belts for a T132

    1. Thanks, Kevin! Always nice to have an alternative. 🙂 Very nice of them to also link to my blog. Or is that your doing? 🙂

      When I was searching for a suitable belt, I had trouble finding any supplier of short 8M belts in the UK or even Europe, that would not charge me £20 a belt. Bearings-R-Us were very accommodating, sending me several different belts until I found the right one by trial and error. But it is truly wonderful to see that another supplier took it up as well. 🙂

      Like

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