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Straw Chopper Frequently Asked Questions > Trouble shooting > Is a knocking sound heard when starting up the chopper?

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Check for adequate clearance between the installed blades and the stationary blades. A minimum of 1/4” is
required. Check clearance of all blades, even those that are not replaced. Do not operate the straw chopper
unless this clearance is maintained for all blades.

Last updated on May 27, 2011 by strawchopper editor