PTO Operating Speed

   / PTO Operating Speed #1  

SOS

Silver Member
Joined
Dec 19, 2006
Messages
232
Location
Fredericksburg, VA
Tractor
NH 45 A (2006)
On my 45a PTO the 540 speeed is at 2500 RPMs. Is there an issue running a brushhog at 2000 rpms if it does not bog or should I always try to run at 2500 RPMs.:cool:
 
   / PTO Operating Speed #2  
If it is cutting OK and the RPM isn't dropping when you hit a thick patch or a sapling, running at 2000 rpm by itself won't cause any damage. I think you will notice decreased performance. I prefer to use a set of headphones and run at designed PTO speed since it really shows that chlorophyll who's boss.
 
   / PTO Operating Speed #3  
SOS:

You might get a lot of opinions subsequent to your question. I run my rotary cutter at the recommended RPMs, but many other operators run their RC's at lower speeds siting less wear and tear on the equipment. If your RC is doing the job at 2K RPMS why not? Jay
 
   / PTO Operating Speed #4  
That should yeild a pto speed of 432.

i'd expect reduced performance.. but don't see how it would cause any damage.

FWIW.. i like to run my implements at their rated speed.. etc. That's also usually where / near the tractors peak efficience is for power and torque.. etc.

Soundguy
 
   / PTO Operating Speed #5  
jbrumberg said:
SOS:

You might get a lot of opinions subsequent to your question. I run my rotary cutter at the recommended RPMs, but many other operators run their RC's at lower speeds siting less wear and tear on the equipment. If your RC is doing the job at 2K RPMS why not? Jay


do you have a tooth bar that fits over your bolt on cut edge ??
if so what kind do you have and where did you get it
thanks dws
 
   / PTO Operating Speed #6  
dws:

Yes I do. I purchased it through my NH/CNH dealer. I am less than impressed with the "fit" and it was pretty expensive :(. I am embarrassed to admit it cost around $500 :eek:. It is approximately 58" wide for my 60" bucket. It appears that it was really designed for the standard duty bucket based on the was it set up on my HD bucket (IMHO). I did have to redrill the two side holes (no big deal). Although I am less than impressed with the fit; I am pleased with the improved utility of my FEL for moving dense material, large rocks, pulling up trees and brush. I will attach some pictures to give you an idea. I do use it pretty hard. Jay
 

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   / PTO Operating Speed #7  
Jay,
did you try take off your bolt on edge and then add the toothbar? It looks like that would help the fit.
 
   / PTO Operating Speed #8  
Ford850:

No I did not due to my laziness :rolleyes:. It would probably match up if I took off the bolt on cutting edge, but the toothbar was advertised as being able to fit over the bolt on cutting edge (and there are a lot of nuts I would have to remove :mad:). The carriage bolts that came with the toothbar were too short to clear the bucket's sides due to the width of the toothbar's 58" and my 60" bucket so the dealer gave me (free) longer carriage bolts. Based on the way I set this up I purchased appropriately sized carriage bolts for back ups. I almost had a coronary over the price :eek: of those bolts. So far everything is working :). It does fit over the bolt on cutting edge as advertised but the fit is poor. I initially was concerned about the lack of continuous contact between the edges for structural/strength reasons, but so far nothing :eek:, :mad:, or :( has happpened. Jay
 
   / PTO Operating Speed #9  
SOS said:
On my 45a PTO the 540 speeed is at 2500 RPMs. Is there an issue running a brushhog at 2000 rpms if it does not bog or should I always try to run at 2500 RPMs.:cool:

When I cut a large open area, I normally run at 2500 rpm and set my speed to the maximum that gives me a decent cut. When I'm cutting brush/briars while backing up and changing directions a lot, I'll lower the rpm down to 2000 or so, but my speed for those things is no where near as fast as cutting in the open.
 
   / PTO Operating Speed #10  
About the only thing I can think of is the reduced "centrifugal force" on the blades at 80% of the designed speed. If your blades are reasonably sharp and you don't mow any thick stuff like multiflora, it should work okay. You want to avoid overspeeding the hog, though. That could mess up your mower's gear box if done a lot.
 

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