Show to adjust the depth of teeth oi 01 a spring tooth harrow so that they will be uniform engineers of the U department of agriculture suggest suggest that the harrow be placed on a level floor with the lever set so the teeth just touch the floor teeth should have a slight amount of tension loosen tension on tight teeth and tighten it on loose ones worn teeth on a spike took harrow may be turned when worn smooth so that a new cutting edge will be it if position teeth that have beai turned once may be re squared by grinding or replaced |