Can I run my FM in 2nd PTO at low RPM's...YM2000

[nazbom2]

In mowing my 6 acres I would be on a long pull and in the draw part where water lays more the grass/pasture grows noticably thicker, so in one pass that would say take three minutes (super rough estimate) when I would hit the draw and the grass thickens I would notice the engine labor more. I'd throttle up to keep engine RPM's up and the black exhaust would roar out. for say 10 seconds then RPM's would increase as load decresed i'd throttle down. So I'd pass this area on my way through say 20 times while mowing. I know the diesel smokes especially when work ut thought I read that black smoke is an indicator of something such as white smoke, gray smoke etc. I used to be told when diesels smoked a large amount that the "fuel was turned up" or not efficiently burning the amount of fuel per injection pulse????

 

[kemary]

I have a YM2500 and I use the 2nd speed on the pto to finish mow all the time. I brought a hand tach home from work to test the pto speeds. 1st pto speed took 2400 engine rpm to obtain 540rpm on the pto, the 2nd speed took 1980 engine rpms to make 540 rpm on the pto so that is what I use for the finish mower only, never with the brush hog. I have put 1500 hours on this machine and probably 1000 of those hours are finish mowing, never any problems. I use a Woods Rd7200 finish mower.

 

[careyo63]

Good to know thanks. I use a JD/Woods 1060R. but always just use 1st' gear Pto. and was curiouse what the Rpm Ratio actually is. I've Ran 2nd. gear I believe it was:laughing: on the 2500 a couple of times getting use to setup of the Pto. :ashamed: Not fond of it At All. I don't think the JD. is setup anything like it?

 

[driftwood]

Running at lower RPMs under a load isnt really good for your diesel. They have a governor that will not allow you to over turn them. Thats also where the black smoke comes from when your tractor gets under a heavy load. The governor gives it more fuel to help out. As said earlier youll build up a lot of carbon in the engine, & harm the bottom end in the long run. Wally

 

[larhan31031]

My yard is mostly crab grass,and I mow it every week or so,and it does'nt strain the motor at all,theres not even a grunt except taking off during the whole session.If i'm pulling my harrow or box blade i'll crank it up a bit,but I never strained it(No black smoke,or choking),it purrs along fine.My main thing is that I dont want to use it to its full potential unless I need to,kinda like buying a car and running it at redline,I feel like its bad for it if I dont need to do it constantly...

 

[winston1]

Let common sense prevail! :thumbsup:

 

[clemsonfor]

My yard is mostly crab grass,and I mow it every week or so,and it does'nt strain the motor at all,theres not even a grunt except taking off during the whole session.If i'm pulling my harrow or box blade i'll crank it up a bit,but I never strained it(No black smoke,or choking),it purrs along fine.My main thing is that I dont want to use it to its full potential unless I need to,kinda like buying a car and running it at redline,I feel like its bad for it if I dont need to do it constantly...

This makes total sense. But a little off thinking. A gas engine is never meant to run flat out or make peak horse power all the time or even half the time. A deisel is meant to get up to operating rpms and stay there or close all day making close to full power. Yea i would not want it rolling black smoke all day everyday pumping max power out but running it at 2200-2400 rpms will not hurt it, afterall pto speed 1 takes 2400 rpms to rach 540pto. Its designed that way and meant to run that way. Think of a heavy equiptment, they dont put around on it, they ildle it up to operating speed and leave it there till they stop then idle down. I work with loggers. The throttle is on a box on the side of the loader on the newer models. They idle up and stay there till they stop even sitting not moving the engine stays at operating rpms, when they pick up a heavy load the governer (well computer in this case) will increase fuel dilivery to maintian rpms and pump pressure giving you puffs of black when it re adjusts to increase power. But they dont run them at half rpms, if it made sense to work or longevity of the equiptment they would on these pieces that cost upwards of $200k.

Not saying what your doing is gonna ruin your tractor, its probly not even hurting a thing, but my point is dont be afraid of idling it up to "working" rpms. In this case your only benefit may be an increase in ground speed, but if your already going as fast as comfortable you will just use more fuel by increasing rpms and gearing down.

 

[careyo63]

I just put some time in with the FM. I was kind of looking forward to it since it was still the first of the Yr. and the grass isn't very thick. Seeing Kemary's post of Rpm's to the Pto and what Eng.Rpm's 2nd Gear Pto should run to reach 540
As for me I LOVE the sound of the 2cyl. I don't hear very well so the noise doesn't bother me :laughing: But it's good enough to hear the motor.
My finding was I ended up still at around 1900-2000 rpms. to hit the "sweet" spot for operating it in 2nd Pto. At 1800 rpms the motor was hitting harder and you could tell there was more of a "Bog down" causing the 2cyl. to hit Compression harder and actually somewhat shake the Tractor. Throttle it up to around 19-2000 rpms. and it would smooth out. I changed Trans. gears High-Low etc. and back to 1st. Pto. several times and without a doubt it there was a noticeable difference. After about a Hr. I left it in 1st. Pto at about 2100-2200 and enjoyed the rest of the day Humming right along as usual. :thumbsup:
In all honesty though Kemary is using a Ym2500 3Cyl. which I have a good bit of seat time on one. Compared to the 2cyl Yammer Hammer with 4hp.less is probly a major factor with my results. FWIW.

 

[nazbom2]

With the discussion of operating RPM's for the correct PTO speed and Power band of the engine, what engine speed are most of you using for say bush hogging or finish mowing? I would think that bush hogging would require a tad more on the power/torque end due to the mass of the blades and the probability that what you are mowing is heavier than say with a finish mower that cuts something more uniform if done regularly. I run mine between 1800-2000 RPM's based on how thick what I am cutting is. The thicker the more RPM's.

 

[clemsonfor]

I dont finish mow much but did just replace the belt on a 6ft bush hog model my uncle had (finish mower) and i way finish mowing at about 2000rpms. I bush hog at say 1800-2200 rpms.