How to Measure a Chainsaw Guide Bar

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The most efficient way to measure your chainsaw blade or bar is to remove the chain and the blade to get a complete and accurate measurement. This task is quite simple and allows you to then check the blade for damages and/or replace the chain or bar if needed. Follow these steps to effectively achieve this goal.

Skill level:
Moderately Easy

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Things you need

  • Socket wrench
  • Flat head screwdriver

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Instructions

  1. 1

    Using a socket wrench, remove the two nuts on the side of the casing, near the handle, that attach the cover to the blade. Remove the cover of the casing once the nuts are completely removed. This will reveal the drive socket assembly, bar and chain of the saw.

  2. 2

    Notice the tension wheel located just inside the bar. Use a flathead screwdriver to turn the screw to the left and release some tension. Pull the chain away from the grooves of the bar. Ensure that all of the grooves are removed all the way down the bar until the chain is free.

  3. 3

    Work the chain loose from the drive sprocket once it is free from the bar by pulling it over the drive sprocket. The drive sprocket is the wheel that is located just under the handle.

  4. 4

    Now pull off the bar or blade and check to see if repairs or replacements are needed before replacing the chain. Some simple repairs can then be made, such as bending a bent bar back into place. If grooves are missing, then a replacement is needed.

  5. 5

    Now that the blade is free, you can take an accurate measurement. Start at one end going and measure the long side all the way to the other end. If you are trying to determine what size blade you need for a replacement, you can also take your old blade to the local hardware store and compare it directly.

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