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Rotary cutter won't cut. why?

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John V

05-18-2001 19:22:19




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I've got a single spindle rotary cutter, couldn't tell you what brand 'cause of the rust. The spindle turns, but as soon as I hit tall thick grass or brush it stops cutting. As far as I can tell the spindle is still turning. I have never worked on one of these before and wondering if anyone can offer any tips for analyzing the problem; probable causes and cures? Thanks for the help.




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Charlie

05-19-2001 16:09:36




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 Re: rotary cutter won't cut. why? in reply to John V, 05-18-2001 19:22:19  
You may also want to see if there is a shear bolt and its OK. You might get enough friction to turn the cutter with no load but would definitely stop when a load was applied, depending on the design.



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Joe Evans

05-18-2001 22:03:12




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 Re: rotary cutter won't cut. why? in reply to John V, 05-18-2001 19:22:19  
Is your mower equipped with a slip clutch assembly installed in PTO shaft? These generally look like several metal plates sandwiched together with 3 to 4 bolts. If so, could be that this is slipping under load. Bolts may be broken or missing or perhaps they require tightening to increase friction on the plates. Maybe your mower uses a shear pin as a safety device. Look at where the PTO shaft joins the gearbox input shaft. Look for a hole in the PTO shaft with maybe nothing in it. Could be if you have a shear pin type, the pin has sheared off, but part of it is still lodged in the gearbox input shaft allowing for just enough interference to let the mower operate with no load but begins to slip when encountering heavy grass. Also jack up the cutter. Please crib up the mower for safety reasons. My old Ford cutter has a large castellated hex nut that secures the knife disc to the gearbox output shaft. This shaft is splined but tapered (and worn). Sometimes the cotter pin that secures the castellated nut will take a hike allowing the nut to back off which in turn will allow the disc to slip down far enough so that the splines no longer engage.

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Tim(nj)

05-19-2001 14:26:49




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 Re: Re: rotary cutter won't cut. why? in reply to Joe Evans, 05-18-2001 22:03:12  
To add to Joe's comments- if your machine has a belt drive (like my old JD 507), check your belt tension, and also check to make sure the belts have not been doused with oil from a gearbox leak. Mine slipped because of that problem. . .



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