The Quick Chain Adjuster is a feature found on select STIHL chainsaw models that allows the user to
adjust the chain tension without using tools. The adjuster is easy to use and allows the chain
tension to be adjusted in seconds. It’s signified by “QCA” or “B” in the chainsaw model name. For
example the MS 251 C-BE and
MSA 140 C-BQ both have the Quick Chain Adjuster.
How to adjust the tension with the Quick Chain Adjuster
To adjust the tension with the Quick Chain Adjuster:
Loosen the chain sprocket cover on the side of the chainsaw
Use the adjusting wheel on top of the chainsaw to tension the chain
