BX25 MAX RPM

[Artisan]

Fellow BX25 owners, can someone tell me what these things red line at please? The manual says not to rev it up for 50 hours I think, so I have not been going past 2400 RPM or so. What will these lil pitbulls tach at all day long running hard? I do not want to put the pedal to the metal for another 30 hours!

TIA!

 

[JOHNTHOMAS]

I've never maxed any of my tractors other than for brief periods when I was reaching the maximum of their ability and I needed just a bit more power to get the rock raised or the load of dirt lifted or that bit of extra uuumph and I use my current BX25 the same way. I just don't do it and it's not based on any great revelation or advanced education degree or even 100 years of experience. I have run my F2680 at near max a few times when the grass was super high and I was in a super hurry, storm about to hit. But I USUALLY DON'T and don't have to in order to get most jobs done.

 

[keyman1808]

I believe mowing rpm is 3200. At least that is what I read somewhere 3200 rpm is where the PTO hits it's proper speed. I have hit my throttle as hi as 3300 once by mistake. But it was only for a second. Normal running around and light loader work I run at 1900. I mow at 3050. Everyone will have their own. Use what works for you

 

[Artisan]

WOW it will hit 3300RPM Ehh? That means I will be very pleased w/ the hoes breakout force when I can rev it up! Thanx again. Anyone else know, will it actually go higher?

 

[AceDeuce]

My dealer advised me to run it at WOT for mowing. I have done exactly that for over 500 hrs without any trouble. I run lower rpms for most other tasks matching engine speed to load and I always bring it down near idle before engaging the PTO. Bottom line---you can't overspeed a BX unless you change the factory setup. You should simply run it at whatever RPM is needed for the job.

 

[oldnslo]

WOW it will hit 3300RPM Ehh? That means I will be very pleased w/ the hoes breakout force when I can rev it up! Thanx again. Anyone else know, will it actually go higher?

Not to burst your bubble but the increase in RPM's from 2400 to 3300 will NOT increase your BH's breakout force significantly. It will only make it operate faster.

 

[keyman1808]

I was upset about pushing it that far. I wouldn't do it but feel free to try it yourself and post your results

 

[David_Kb7uns]

The D902 super mini engines come in a 3200rpm version and one set for 3600rpm.


Kubota Engine America - Compact Diesel Engines

David Kb7uns

 

[radioman]

Not to burst your bubble but the increase in RPM's from 2400 to 3300 will NOT increase your BH's breakout force significantly. It will only make it operate faster.

yup.. he is right about that.
For RPMs, I'd just run it under 2800 till its broken in. On these BX's , they can be run at 3200 to WOT. I believe that kubota has already prevented the engine from running in the redline area. Problem is I cant confirm this via mechanical stop or is governor built in.
The only way you can redline it now is to tip it over and let the oil get past the seals to top of piston and burn as fuel.

 

[Tractor Seabee]

I have a BX 25. I tried from both the factory and the dealer to get the power curves for the engine RPM vs PTO RPM and Hyd PSI. Was given the run around. Factory referered me to the dealer and the dealer said no such info is available. The manual says PTO speed of 540 RPM (most rear mower or tiller optimum operating speeds) is at reached at 3043 engine RPM. The engine is rated at 3200 RPM for a gross HP of 23. Several places the manual talks about operating at rated RPM. The Tach has no redline. With the throttle wide open the Tach does not reach the peg. I also have the Shop Manual for the BX 25. If you do your own work do not try w/o haveinfg the shop manual. Pages G-47 and 48 gives maximums for attachments but does not discuss speeds or pressures. There must be a governor but it is not discussed, probably they reserve that subject for factory trained mechs.

I never run above 3000 RPM and then only for the mower and tiller if going is tuff. Usually operate in the low 2000s for most work and it does fine. I see very little hydraulic function change above around 2400 RPM. The engine seems to scream at 3200 RPM. Bottom line though as I interpert this whole thing is 3000 RPM is what the factory designed it to operate in a sustained mode. I like to baby stuff, seems to last longer.

Ron