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Description
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Tech Tip — Measuring a Belt
Oregon Belt Measurer 75-910 1. Define type of belt :
• 3 L = 3/8" or 9.5 mm • 4L = 1/2" or 12.7 mm • 5L = 5/8" or 15.9 mm
2. Fit the belt over the blue plastic split pulley and pull the bottom half down tight.
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3. If you are measuring an industrial belt (bulgy top), look at the left-hand slot in the half pulley.
The size (section) of the belt is indicated by the intersection of the belt top with one of the white blocks, either A or B.
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If you have an FHP belt (flat top), the same procedure applies to the right-hand slot. The belt in the photo is a 4L belt (the section). 4. Now that you know the belt’s profile (section), look at the window below the split pulley and find the section number for your belt (3L, 4L, 5L, A or B) printed in white on the left side of the window. The number opposite or closest is the length in inches of the belt you are measuring.
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75-910
Cloth Tape Measure 1. Place the beginning of the cloth measuring tape anywhere on the outside of the belt 2. Wrap the tape around the complete circumference of the
belt until it wraps back around to its beginning 3. Where the two meet, read the length given
2025
TechnicalServices@OregonProducts.com 1.800.223.5168
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