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Sickle Mower Adjustment. Adjusting the Belt Tension and Replacing a belt on a sickle mower 3 point tractor implement. - Ranch Hand Tips In this video I'll show you how to replace or simply adjust your tension on a Sperry New Holland 451 Sickle Mower. Sickle Mowers are often called reciprocating mowers, bar mowers, sickle-bar mowers, sicklebar mowers or finger-bar mowers. Sickle Mower Belt 451 New Holland http://amzn.to/2u6POxR Follow our Rankin Ranch "Ranch Hand Tips" Videos for more information on adjusting, using, and maintaining a Sickle Mower. https://www.youtube.com/channel/UC60fxBZhfGR0yYtveRmPJNg We love North Carolina Agriculture! Help us grow the Rankin Ranch:http://www.gofundme.com/RankinRanch