OP
dogbreath108
Bronze Member
- Joined
- Jul 10, 2007
- Messages
- 58
Sorry it took a while to get back here...
The guy said he was trying to flip up a stump, had the bucket locked under it and the new R-1 front tires pressed down hard to the point where they "would not slip"... "and the case just did not take the torque".
My guess is that he did not have a rear counter weight on the tractor at the time and there was very little ground pressure on the rear to limit the torque going to the front end (he did have a NH backhoe for the tractor but it looks like he didn't have it on at the time). It is also my guess (I hope) that he had it in the lowest gear possible. I don't believe he had the forth range "creeper" gear option (which have been known on all tractor brands to be disasterous to drivetrains if not used properly). But the lowest gear on the typical 3 ranges on the 2120 is still very low.
more 2 cent thoughts...
The internal "webbing" of gearboxes (transmissions etc.) is usually so strong that you will snap a shaft or a gear first before the case goes (unless obviously the broken piece goes through the case before it stops). The drive shaft gear in this set up (like most center line drive tractors) relys on the sidewall/bottom of the case for strength. I would think that you could duplicate this failure time and time again if everything else was duplicated exactly. If he had just a little slippage in the front wheels, I don't think it would have happened.
Also, he was looking to get just about what the tractor was worth without the broken case. (At least what I think it was worth in good shape). There are a TON of sizing and clearance checking on the other components in this case, so even if just the case is 2 to 3K and you did the repair yourself you would need a lot of time. I would expect most people would have a dealer work on it and charge around 4 or even maybe 5K ... ?
One more note and then I will shut up...
On the newer TC 48 and 55 tractors the lower driveshaft gearbox was replaced with a larger unit with a clutch pack for on the fly 4wd shifting (if I'm not mistaken). Does anyone know if the unit also is engineered to work as a slip clutch to prevent something like this?
Joe
Hope you all have a good Thanksgiving.
The guy said he was trying to flip up a stump, had the bucket locked under it and the new R-1 front tires pressed down hard to the point where they "would not slip"... "and the case just did not take the torque".
My guess is that he did not have a rear counter weight on the tractor at the time and there was very little ground pressure on the rear to limit the torque going to the front end (he did have a NH backhoe for the tractor but it looks like he didn't have it on at the time). It is also my guess (I hope) that he had it in the lowest gear possible. I don't believe he had the forth range "creeper" gear option (which have been known on all tractor brands to be disasterous to drivetrains if not used properly). But the lowest gear on the typical 3 ranges on the 2120 is still very low.
more 2 cent thoughts...
The internal "webbing" of gearboxes (transmissions etc.) is usually so strong that you will snap a shaft or a gear first before the case goes (unless obviously the broken piece goes through the case before it stops). The drive shaft gear in this set up (like most center line drive tractors) relys on the sidewall/bottom of the case for strength. I would think that you could duplicate this failure time and time again if everything else was duplicated exactly. If he had just a little slippage in the front wheels, I don't think it would have happened.
Also, he was looking to get just about what the tractor was worth without the broken case. (At least what I think it was worth in good shape). There are a TON of sizing and clearance checking on the other components in this case, so even if just the case is 2 to 3K and you did the repair yourself you would need a lot of time. I would expect most people would have a dealer work on it and charge around 4 or even maybe 5K ... ?
One more note and then I will shut up...
On the newer TC 48 and 55 tractors the lower driveshaft gearbox was replaced with a larger unit with a clutch pack for on the fly 4wd shifting (if I'm not mistaken). Does anyone know if the unit also is engineered to work as a slip clutch to prevent something like this?
Joe
Hope you all have a good Thanksgiving.