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How to measure V-belts

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steppinthrax

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I have an old V-belt off a rotary tiller, unfortunately they don't have the parts for this anymore. I got as far as measuring the length and multiplying by 2. However, is there a belt "coding system" based on length?
 
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Measure the actual outside length, then subtract ~2in to get the pitch length. For example: a belt trade-named "AX-70" measures ~72inches around the perimeter. Unfortunately some lawn and garden belts are measured around the outside, so you'll have to use a careful eye. Your best bet is to just take your old belt in and compare.
 
JCH13 said:
Your best bet is to just take your old belt in and compare.
Click to expand...

This is what i'd do. Do you have a Tractor Supply Co. store around you? They usually have 2 or 3 dozen different types of belts.

Also can you read any of the lettering on the outside?
 
Just bring the belt to NAPA/anyplace and they will fix you up.
As long as it is not too old-Make /Model/SN bet you can find the factory manual=OEM belt number and a whole lot more.
 
If the belt is gone you can wrap a string around the pulleys and get the total length that way.. you will want to error on the larger size though, since the string will give a smaller-than-pitch-diameter measurement.

Martin and a few other manufactures have belt selection charts, so if you know the pulley diameters and center distance you can select the right belt.
 
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