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Bushhogging

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RDNCK

07-12-2000 18:28:03




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I was reading the other day about bush hogging and someone said not to do it in 2nd gear.It seems to me that 1st is too slow and 3rd is too fast. I also remember reading to run the bushhog at 540 pto rpm. My tractor has a proofmeter that seems to be about right.Should I set it to 540 and bushhog in 3rd gear or wide open in 2nd gear? I appreciate all the help so far and thanks in advance for later.

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raytasch

07-13-2000 14:49:19




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 Re: Bushhogging in reply to RDNCK, 07-12-2000 18:28:03  
FWIW, the same weak second gear tranny is used in some later series tractors. I know the 3000 4 speed is the same and I suspect the NAA, 600s, 800s, and probably more. ray



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Nolan

07-13-2000 03:45:57




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 Re: Bushhogging in reply to RDNCK, 07-12-2000 18:28:03  
2nd gear is only half as thick as all the others. It's the weak link in the transmission. Not cheap to fix, and it isn't a fun job.

And if you're a geek like me, you're looking at this going "but the pto doesn't get driven through the gears!" Absolutely true, so theoretically it shouldn't matter. But, it does. For whatever reason, as Zane has pointed out, hogging in second kills the gears.

So first gear it is. What the heck, you'll get a much better looking job this way.

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dave#1

07-13-2000 04:46:29




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 Re: Re: Bushhogging in reply to Nolan, 07-13-2000 03:45:57  
See, ya learn something new everyday !
I felt the same as you til I read this reply from our main man Zane !



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Nolan

07-13-2000 10:49:38




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 Re: Re: Re: Bushhogging in reply to dave#1, 07-13-2000 04:46:29  
I've no argument with Zane, and fully agree that 2nd gear is the weak link, and that it dies easily when bush hogging.

Following the power through the pieces leaves you kinda confused though. It comes in the input shaft, and goes down to the counter shaft. No problems there. At the far end of the counter shaft, the pto connection exists. This leaves all the drive gears out of the picture. So, it shouldn't matter what gear you're in when the pto encounters a heavy load.

So much for theory and following power transmission, because if you're in second gear, you're darn well more likely to break it.

Now it may be that it's not the pto load that kills it, but the shock to the drivetrain when the front edge of the hog hits the stump. For similar warnings about plowing in 2nd gear exist. As in that momentary stall and the horrible windup that occurs inside the transmission.

In any case, 2nd gear is weak, and doing hard things should be done in first as a result.

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dave#1

07-13-2000 15:04:14




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 Re: Re: Re: Re: Bushhogging in reply to Nolan, 07-13-2000 10:49:38  
Well, I might agree with ya on that till I read this.
It seems it's the impact of the blades that transfers up the pto shaft that blows second gear and not torque or shock of a plow and such hitting whatever??

Hey Zane?, jump in here, I'm just reading what you wrote! (-:

later,me



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ZANE

07-12-2000 20:13:59




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 Re: Bushhogging in reply to RDNCK, 07-12-2000 18:28:03  
This is straight from the horses mouth! If you don't want to spend a lot of dough on the 4 speed transmission then you had better not do any bushoging in second gear. When I worked in a Ford tractor dealership back in the late 50s and early to mid 60s nearly every transmission I had to repair was second gear damaged by bushoging. I really don't think it would damage the second gear if all you were doing was cutting some grass on level ground with no hidden obsticles to hit but I do know for a fact that if you hit something good and solid at a high RPM in second gear you are going to break it. The 9N and 2N are an all together nother story and I have never had to repair a transmission on one at all. This leads me to think you can use which ever gear you want to when using the 3 speed transmission in the 9N or 2N.

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2fordsmike

07-13-2000 15:03:46




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 Re: Re: Bushhogging in reply to ZANE, 07-12-2000 20:13:59  
Zane: We bush-hogged with 8ns and NAA for 1,000s of hours forty years ago, mostly trimming pastures, and 99% of the time in 2nd gear. I do not remember a single problem with a transmission in those tractors. If we were in brushy conditions we ran in low. If a few stobs were 2-3 inches diameter, we backed into them, cautiously. If there were rocks we mowed high, like 5-6 inches. Your no-second-gear mowing is good advice for bad conditions (and an unknown field) and utmost caution. But for the pasture with no rocks, I'd still go in second. Mike-Iowa

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rbell

07-13-2000 06:25:43




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 Re: Re: Bushhogging in reply to ZANE, 07-12-2000 20:13:59  
Thanks Zane, I was just about to ask if the same was true with the 9s



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Bob [ME]

07-12-2000 18:52:57




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 Re: Bushhogging in reply to RDNCK, 07-12-2000 18:28:03  
I find that 1st gear, though slow, gives me the best cut with my bushhog. If I use 2nd, I end up having to go over much of it again. That's using a 2N.



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Salmoneye

07-12-2000 19:12:41




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 Re: Re: Bushhogging in reply to Bob [ME], 07-12-2000 18:52:57  
If I may paraphrase a more educated individual than I...'All I know is what I have read, and what I have been told'...Do NOT Hog (or any other activity that may send shock back through the shaft to the tranny) in 2nd gear!!!
The physical 2nd 'gear' inside the tranny is 'thinner' than the rest. This is the single biggest engineering problem with the 'N' tranny.
I was told to pull the the shifter and cover if I didn't believe it...It is true...Do it your self...2nd is a much thinner 'gear' and can not withstand repeated impacts back through the PTO shaft like the other gears...Not that the other gears like it much...:)

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