Introduction
Follow this guide to replace the upper drive chain on a 2018 Classen Sod Cutter model HSC18AHD.
Tools
Parts
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            Grab the plastic housing at the end of the spark plug wire. 
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            Pull firmly to disconnect the wire from the spark plug. 
 
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            Use a 1/2 inch socket to remove the three bolts securing the cutter blade on the left side of the machine. 
 
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            Use a 1/2 inch socket to remove the three bolts securing the cutter blade on the right side of the machine. 
 
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            Carefully tilt the sod cutter on its side. 
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            Use a 9/16 inch socket to remove the nut securing the chain guard. 
 
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            Use a 3/4 inch socket to loosen the bolt securing the tensioner sprocket until it can freely slide up and down the bracket. 
 
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            Roll the machine to turn the chain until the master link is accessible. 
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            Notice the open end of the master link retaining plate is facing down. 
 
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To reassemble your device, follow these instructions in reverse order.