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Do I loosen the nut that holds the push rod guide plate ?

What engine are you adjusting the valves on. If Briggs, there should be a nut on top of the rocker, with either a torx set screw in the center or if Vanguard a double nut to lock the adjustment setting.

kohler sv 600

This manual should help you.

http://www.mymowerparts.com/pdf/Koh...urage-SV470-SV480-SV530-SV540-SV590-SV600.pdf