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How much abuse will it take?

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Rob N Va

07-09-2003 07:53:28




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I was just wondering about the tranny on my 50' 8N. I usually throttle down before I shift, but the other day, I got in a hurry with the bush hogging and slammed her into reverse at full throttle. Of course I am using the clutch, but I have found that at higher rpm's it grinds when I shift, as it did this time. When I let the clutch out the rear tire spun. All I could think about was how expensive it might be to overhaul the tranny on this thing, and that being that I have never touched a tranny in my life, I might be faced with getting a shop to do it. So what's the scoop? Are these tranny's built "Ford Tough"? Thanks for any comments and feedback!--Rob

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Dave OH

07-09-2003 15:37:31




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 Re: How much abuse will it take? in reply to Rob N Va, 07-09-2003 07:53:28  
Just remember the sugestion about the ORC (Over Running Clutch. If the blade don't stop without one on and you shift while it is going at a good spin you won't need to worry. No gears and maybe no you if it jerks foreward or backward hard enough.
Dave OH



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MikeC

07-09-2003 10:02:13




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 Re: How much abuse will it take? in reply to Rob N Va, 07-09-2003 07:53:28  
Rob,
Even though the tranny may be able to take it, why abuse it like that? No matter how well built any transmission or driveline is, with enough abuse it will break. No need to see where that breaking point is if you can avoid it.



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Rob N Va

07-09-2003 13:46:08




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 Re: Re: How much abuse will it take? in reply to MikeC, 07-09-2003 10:02:13  
Point well taken. No, I have never tried to "shift" while moving. Even I know better than that. It was hot, I was tired and trying to get the job done too fast is all. I simply forgot to throttle back when I was "changing" gears. After I did it, I realized my frame of mind and considered that Tired, and Tractor can be a deadly combination, so I quit for the day. I was just kicking myself for being hard on the ol' gal. I figured I'd ask the pro's what the score is on running them too hard. Thanks for your input! All points well taken. I suppose if everyone out there treated their tractors like trailer queens, they would never break down, huh?
---Rob (Taking my game down a notch) N Va

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pat

07-09-2003 09:31:45




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 Re: How much abuse will it take? in reply to Rob N Va, 07-09-2003 07:53:28  
Rob;
First I hope you are not trying to shft gears with the tractor moving. N tractor transmissions are not syncronized to be able to shift gears while moving. It sounds like you need to slow your pace down a little. I never shift at high throttle. What's the point. It's easier on the tractor to take it easy.
Treat it right and it'l treat you right.



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David - OR

07-09-2003 08:59:39




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 Re: How much abuse will it take? in reply to Rob N Va, 07-09-2003 07:53:28  
Generally speaking, the pulling power of tractive machines is limited more by weight than by horsepower. The wheels spin before the torque capacity of the engine (or the driveline) is reached. I don't know if you have weighted tires, but on a hard, dry field it's no big surprise you could spin the tires.

Reverse on the 8N is a relatively high gear, and transmits less torque to the output shaft and rear end than 1st gear would. So you are less likely to damage these from an overload. On the other hand, the gearing for reverse itself may be weaker than the other gears, since reverse was (generally speaking) not intended to be a "work gear" for the tractor.

I'm assuming you didn't try to shift from forward to reverse at full throttle while the tractor was still rolling forward -- that would be pretty abusive treatment. Same story if you are operating without an ORC and are trying to shift while the hog is still spinning.

If the gears grind as you shift into reverse with the tractor stopped, I suspect your clutch pedal freeplay needs adjustment. The throttle position should not matter.

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don b

07-09-2003 09:25:43




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 Re: Re: How much abuse will it take? in reply to David - OR, 07-09-2003 08:59:39  
You should never"shift" gears.The tractor should be stopped and clutch dis-engaged to change from one gear to the other.Second gear is the weakest gear. don



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Luc8N46492

07-09-2003 08:34:51




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 Re: How much abuse will it take? in reply to Rob N Va, 07-09-2003 07:53:28  
It seems to me that the transmission is not the weak part of the system. I see the cast iron casing as being that. When I bought my '48 N, I noticed that someone had done some brazing on the casing. It seems that a previous owner bottomed out and peeled off the drain plug (it was welded into the casting).

In hind sight, I should have immediately dismantled and had the casing properly welded. This flexing of the casing, I firmly believe, was the cause of two replacements of transmission gears. During the first replacement I figured that the tractor is 50 years old, the gears were worn and caused damage, when I had to replace gears again, I looked for the cause. Proper welding and identification and welding of two other cracks have left me with two years of uninterrupted useage.

Luc

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Bob

07-09-2003 08:02:52




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 Re: How much abuse will it take? in reply to Rob N Va, 07-09-2003 07:53:28  
The first tractor I was allowed to drive as a kid was the 8N. I abused the heck out of it, and even dug up a couple of old buried 500 gallon tanks with it! (With a Davis loader) I remember spinning the wheels, and jerking it from forward to reverse. The poor thing withstood all that, but years later, finally I lost teeth in the ring and pinion. I put in a used ring and pinion set, and it's still going strong!!! Never have has a transmission problem. I have seen posts where people have said N's wont stand up with a loader, but this one sure took a beating and came back for more. Before our family adopted it, a cement contractor had used it for years for hauling sand and gravel around construction sites.

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