Smith Corona Electric Portable Typewriter Dual Belt Replacement using O rings - YouTube<br /> by [[Phoenix Typewriter]] <br /> accessed on 2025-08-28T12:05:
o-ring replacements for Smith-Corona typewriters<br /> www.torkdistributors.com<br /> Filter O-ring replacements<br /> W34-OR 152030 <br /> 4.125" diameter
also could try Culligan OR-34 versions
https://www.amazon.com/dp/B074SV5WTX
Drive belts u/NisKildegaard recommends for SMC electric typewriters. via https://new.reddit.com/r/typewriters/comments/1f7mhz6/comment/llb1peu/
Electric Repair Tip: Drive Belt Replacements by [[Sarah Everett]] of [[Just My Typewriter]]
these 7:36 are the ones i picked up and these were 7:38 three and three-fourths by four by 7:40 one-eighth
Sarah Everett has used water filter o-rings of 3 3/4 x 4 1/8 to replace the drive belts of her electric typewriters.
SCM Electric Typewriters by [[Joe Van Cleave]]
Tips for cleaning the Smith-Corona 6 series electric typewriters and details about how they work.
S-C also made this series of typewriter for both Sears and Singer under their branding. (including the Singer Electric in this video.)
The belts on the electric motor and cams was originally a rubber 'V' belt which is no longer manufactured. Using 1/8" round cross-section o-rings of appropriate sizes (for water cannister applications) is the recommended replacement, however one may need to slightly move the drive motor down a bit so that the belt doesn't hit the frame of the typewriter and thereby destroying it over time.
Cleaning and lubricating the drive motors and moving pieces before using may help before trying out a typewriter which has been sitting for long periods of time.
Some later models had an electric return, which can tend to be violent. Electro 220 and Coronet Automatic 12 have an additional clutch and draw band (and lack of return lever on the carriage) for their electric returns.
I was able to buy replacement toothed belts from an industrial seller via eBay by measurement. Actual Gates belts. Mine fit a Smith Corona electric 6TE and the part number is 3M315 but once you know the width and length it’s a matter of translating it into a Gates part number.
https://www.gates.com/us/en.html
Sells belts including v-belts which might be used for typewriter repair parts.
Smith-Corona electric typewriters were designed to be turned on and run all day. As a result, old machines which have v-belts with odd grooves in them from sitting so long will sometimes have a recurring thump sound. This can be remedied by running the machine for several hours at which point the belt will warm up and remove the crease. Naturally, one might also remove the belt, warm it up using other means as a method of removing age-related creasing.
https://www.biedlers-belts.com/single-v-belts/polyflex-belts/ This is about the only place that I have been able to find the small V-Belts used to drive IBM and Smith Corona electric typewriters (among others). You can find most any belt you need on this site if you know its dimensions.