Posted by JMOR on October 18, 2015 at 11:18:53 from (76.182.223.85):
JDSeller, I have had this question for a long time & have decided that you are likely to have a good answer for me if anyone does. This is an old Austin Industries/Austin Products, Inc., Dallas, TX (bough by Servis/Rhino in later years) 8 foot, dual spindle shredder/brush cutter. It has never cut very cleanly compared to three small 5 foot units that we use. I have tried many things: good sharp blades, setup with front an inch lower than rear (measured at blade tips, not housing), verified PTO speeds with PTO tachometer, even went so far as to swap gear boxes around so as to reverse rotation of spindles, all with virtually no significant improvement. Other observances: accounting for PTO speed, gear ratios, length of spindle-to blade-tip, this unit has a blade tip speed of 10,300 feet per minute @ 540 PTO rpm. The 3 other units blade tip speeds are, 10,700 fpm, 12,750 fpm, 16,300 fpm, and new SERVIS catalog cutters show 10,000-heavy brush, 15,000-standard, 16,500-finish. Khun hay mower-15,800 fpm. Of my three 5 foot units, even the 10,700 cuts easily two or three times cleaner than the 8 foot unit and the 16,300 very clean as you would expect, but can't even handle thick heavy grass behind an 8N. I have run the 8 foot behind both 44HP and 67HP tractors and at various ground speeds, all with nasty looking results over several years in different kinds of growth. Question is, do you have any ideas as to why this thing cuts so poorly? Potential remedies? Thanks, in advance for any experience/insight/etc.
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