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Estimating RPM

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wallacedw

11-23-2007 09:30:19




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The tachometer doesn't work on my Farmall 400. Until I can fix it, is there a way to estimate the 540 RPM's needed for mowing with a bush hog? I haven't got the tractor yet so some of my questions may be kinda dumb. I get the tractor next week. I am going to buy an owner's manual and that will help some but without the tach I am not sure what to do.

Thanks,

Dan




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wallacedw

11-24-2007 17:51:06




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 Re: Estimating RPM in reply to Mark-Mi, 11-23-2007 09:30:19  
Thanks fella's! Sure is nice to have a place for a newbie to ask questions....



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D Slater

11-23-2007 16:19:28




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 Re: Estimating RPM in reply to wallacedw, 11-23-2007 09:30:19  
If the governor is set to factory settings the IPTO turns at 534 RPM full load and 587 no load.



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Steven f/AZ

11-23-2007 16:05:49




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 Re: Estimating RPM in reply to wallacedw, 11-23-2007 09:30:19  
I agree with the others, RPM is not that important with a brush hog. I believe those tractors wouldn't exceed 600 rpm full throttle, no load anyway. If you go full throttle and back off a notch you will be just fine... third party image



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Janicholson

11-23-2007 15:46:24




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 Re: Estimating RPM in reply to wallacedw, 11-23-2007 09:30:19  
The PTO can be run wide open. Ignore the situation (unless the governor has been tampered with, it won't matter a bit. Just not an issue. JimN



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bradley martin

11-23-2007 14:40:24




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 Re: Estimating RPM in reply to wallacedw, 11-23-2007 09:30:19  
Get a hand held tach (available at any auto parts/tool store) and hold it against the end of the stub shaft. As Old said...if you are running 3/4 to 7/8 full throttle you will get along just fine bush hogging.



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old

11-23-2007 09:38:36




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 Re: Estimating RPM in reply to wallacedw, 11-23-2007 09:30:19  
Would you believe that 540 number isn't all that important when it comes you useing a brush hog. I.E. if the PTO is spinning 600RPM or if its spinning 500RPM its no big deal. That said if you run the engine about 3/4 trottle you will have it very close to the 540RPMs Also a lot of people like to use the higher gears when brush hogging but its a good idea to use a low gear and take you time doing the work. Using a low gear is better for both the tractor and the hog and doesn't beat either up as bad as using a higher gear

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