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Installation Instructions - Replacement Belt for Craftsman Compressors Craftsman Compressor Drive Belt - pn : 09 919 At2210 , has been designated a substitute part number - 09 919 N011005 . Proper belt tension is critical to ensure maxium belt life . A belt tension guage , called the Krikit I , which retails for $ 10 - 15 , is available at local auto parts stores and some large chains . . This guage will work for belts up to 7 / 8 " wide and has a 30 - 150 pound range . . Please purchase this item locally . Follow the steps below to tension the belt : a ) Using a 3 / 8 " wrench , loosen screw on idler assembly . . This will release tension from the old belto b ) Remove connecting rod bolt and move connecting rod from bearing support while leaving piston portion in cylinder , , c ) Remove old belt and replace with new bell If using A12210 belt , place lettering on the belt against the flywheel ( large diameter pulley ) . . If using N011005 belt , place lettering away from flywheel ( belt teeth against flywheel ) d ) Replace connecting rod and botto Tighten bolt to 100 - 120 FT - LBS . e ) Tighten the idler screw to about 40 IN - LBS . There should be enough friction to hold the idler in place while tensioning . f ) Rotate the idler assembly clockwise , using a 5 / 8 " wrench , rotate flywheel a few times to equalize the tension . The tension gauge should read between 60 - 80 LBS when checked on the longest belt span . To lock the idler assembly in place , tighten screw to 84 - 120 IN - LBS . Re - check tension , and adjust as needed Â°