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How do you measure a v belt to buy a replacement?

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Measure the inside or outside overall length of the belt. Either measurement will work as long as you know which side it is you measured. You will also need the width on the "top" edge, the edge that would be facing out from the pulley and the height from that same edge to the opposing narrow edge.

The old one likely has the part number embossed on the belt if you can find it; something like 4VL32 or B32 or something similar.

Your best bet for replacing it would be to take the old piece(s) to a local power transmission products dealer and they can match it up. Even auto part shops care some v-belts if you get lucky and it matches up with those used in automotive applications.

A typical v-belt is under ten dollars.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at Positive feedback is appreciated once your problem is solved!


Posted on Dec 30, 2010


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I need to know belt sizes

Best way is to buy a new belt as a spare part for your machine or a belt manufacturer might have a listing for your machine in an application catalogue.
Failing these options you will need to measure the old belt or around the pulleys in order to determine the size you need.

Suppliers of belts have a device to measure belts and so a worn belt can still have a valid measurement the belt is turned inside-out first.

If you have to measure around the pulleys don't forget to move the belt adjuster almost back to the starting point first and then measure around the root of the pulleys using none-stretch string or flexible wire and then measure around the top of the pulleys with a flat tape measure.
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