Posted by sotxbill on August 23, 2009 at 18:18:45 from (70.234.205.17):
In Reply to: Bush hog RPM??? posted by Mike Hodgins on August 23, 2009 at 11:26:35:
most pto driven implements are met to run at the advirtised pto rpm... and a rotary cutter is one of those. you need to run the pto at 540 rpm for the blades to spin at the correct rpm to cut the grass and clean the blades and cutter so that it can cut more grass.. hay balers, rotary tillers etc are all made to run at 540....so you should keep the rpms at that setting and pick a gear to adjust the ground speed, not use the throttle for ground speed.
the only exception is the post hole digger.. most post hole diggers will dig just fine a slightly above an idle... and then if you snag a root, the tractor engine will stall.. this is correct and will save you and your digger. the post hole digger will not dig faster at higher speeds but will usually just heat up the blade tips and dull them faster. so a post hole digger is about the only thing you run at a slower speed than 540 rpms...
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