powwowell
Member
What RPM should I run my EX3200 at? I'm using a older 5' Woods finisher mower. And, a 5' brush cutter. Thanks.
RPM Question
- Thread starter powwowell
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dusty3030
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- Kubota MX5400 Cab, Kioti NX6010 Cab, Kioti RX7320 PS/ Cab, Kubota M7040 HDC, John Deere 2355, Kubota U35-4, John Deere 317G
2500 to 2600 engine rpm should be 540 rpm on the PTO.
http://www.yanmartractor.com/files/3413/5058/9158/ex_series1.pdf
http://www.yanmartractor.com/files/3413/5058/9158/ex_series1.pdf
BuilderML
Gold Member
You should be able to fine the right rpm after alittle use. With my 60" MMM i run at about 1800-2100 rpm and find it has no problems.
Let me state the reason I asked about RPMs. The recommended RPM for the finishing mower seems high to me. The last thing I want to do is harm my tractor. But, if I can get away with a slower RPM, it seems to be that 1) I'm saving some diesel and 2) maybe some wear and tear on the tractor?
Thanks for the replies.
BuilderML
Gold Member
Like i said the more you use it you'll find its sweet spot. That max rpm would be for maximum performance. Lets say your travel speed is fast and the grass is real thick and tall. You will need a higher rpm to have a nice cut and have it keep up with your travel speed. If you slow down your travel speed you shouldn't need as many rpm/power to the mower to have the same cut. Same goes with the brush cutter if your going slow and your not cutting thick stuff you shouldn't need as high of rpm. So yes i look at it the same way you do, save fuel and less wear on moving parts. As i have come to learn thanks to TBN lets say you hook up a generator to your pto you will need to run that at the required rpm to have the proper hertz and voltage generated. But as far as a cutter goes you will find out whats works best for you with playing around with it. By lowering the rpm will cut down on your blade speed but if you don't need max blade speed why use it. Also i would NOT turn your pto on at max rpm. I turn on my pto for my MMM at about 1400-1500 rpm and then move up to about 1800-2100. Same goes in reverse when you go to shut it off throttle down first before turning of your pto. Hope this helps.
alltherage
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I run our ex2900 at about 2100 generally w finish mower. The blades bottom out n dull in our yard so I need some extra speed. Could easily get by at1800 otherwise. Rpm depends on many factors
Gary Fowler
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You should have a mark on your tachometer indicating 540 PTO speed. That is the do not exceed speed as your PTO equipment is designed to operate at that speed. Over speeding will cause gear box to heat up more than normal and could stress the blade connections also. Anything under the rated speed is ok as long as you have the power to pull the cutter without lugging the engine and it is cutting clean enough for your. Your best cut would be at PTO speed and it isn't going to hurt your tractor to run it at that speed OR wide open throttle (WOT) when not using the PTO. The engine is designed to run at WOT 100% of the time without damage as long as proper oil and coolant levels are maintained.
Your automobile engine runs 2000+ RPM at cruise all the time for hours on end and much more than that during acceleration, so why would you think your tractor engine couldn't run at design speed without damage. You are more likely to damage a tractor engine running it too slow than too fast.
With regard to saving fuel, my tractor has a 3 speed gear box for the PTO and I sometimes run it in 750 mode with 62% of rated PTO speed on the tach when doing light cutting. This does save me some fuel as my 7 foot BH on my 70HP engine tractor hardly knows the cutter is working.
Your automobile engine runs 2000+ RPM at cruise all the time for hours on end and much more than that during acceleration, so why would you think your tractor engine couldn't run at design speed without damage. You are more likely to damage a tractor engine running it too slow than too fast.
With regard to saving fuel, my tractor has a 3 speed gear box for the PTO and I sometimes run it in 750 mode with 62% of rated PTO speed on the tach when doing light cutting. This does save me some fuel as my 7 foot BH on my 70HP engine tractor hardly knows the cutter is working.
