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Archive through December 15, 2009
- Thread starter bbrigham
- Start date
Help Support IH Cub Cadet Tractor Forum:
Ron,
I went out to the barn and looked tonight like I should have done to begin with instead of going from memory. You're right that they're not straight cut, but they're not hypoid either. They're spiral bevel gears. I'm basing this on the 125 transaxle I have the cover off of in the barn.
Spiral gears are the bevel equivalent of a helical gear. The difference between spiral and hypoid bevel gears is that spiral gears' axes intersect each other; hypoid gears' axes are offset.
You could flip the carrier with straight, spiral, or Zerol bevel gears. If you try to flip the carrier on a hypoid gear set it will off set the pinion axis to the wrong side of the ring gear axis and they absolutely will not mesh.
Hypoid gears are stronger loaded one way vs. the other, but is not like they're weak in reverse. Most 4wd front axles have hypoid gears running on the back side of the teeth. With straight bevel gears, there's no disadvantage one way or the other. In the case of spiral and Zerol bevel gears, there's no practical difference, and if there's a theoretical difference it isn't worth talking about.
Jerry
I went out to the barn and looked tonight like I should have done to begin with instead of going from memory. You're right that they're not straight cut, but they're not hypoid either. They're spiral bevel gears. I'm basing this on the 125 transaxle I have the cover off of in the barn.
Spiral gears are the bevel equivalent of a helical gear. The difference between spiral and hypoid bevel gears is that spiral gears' axes intersect each other; hypoid gears' axes are offset.
You could flip the carrier with straight, spiral, or Zerol bevel gears. If you try to flip the carrier on a hypoid gear set it will off set the pinion axis to the wrong side of the ring gear axis and they absolutely will not mesh.
Hypoid gears are stronger loaded one way vs. the other, but is not like they're weak in reverse. Most 4wd front axles have hypoid gears running on the back side of the teeth. With straight bevel gears, there's no disadvantage one way or the other. In the case of spiral and Zerol bevel gears, there's no practical difference, and if there's a theoretical difference it isn't worth talking about.
Jerry
Just throwing this into the discussion; both Midwest Supercub and Vogel mfg now offer reverse spiral ring and pinion sets for diesels and other engines that turn the opposite direction. I would think that if there wasn't some demand for them they wouldn't have bothered. They are heavier duty (wider teeth) than stock.
I have been told that the stock spiral ring and pinion won't live very long if you reverse them.
This probably depends a lot on how much power you are trying to put through it. Some of these turbo diesel tractors are probably pushing 100 hp or more. It probably helps to have the heavy front pinion bearing and holder up to a point as well.
For mine, I'm using the straight cut ring and pinion from an aluminum rear-I hope it holds up for a while. But I figure eventually I'll have to go with the aftermarket set.
I have been told that the stock spiral ring and pinion won't live very long if you reverse them.
This probably depends a lot on how much power you are trying to put through it. Some of these turbo diesel tractors are probably pushing 100 hp or more. It probably helps to have the heavy front pinion bearing and holder up to a point as well.
For mine, I'm using the straight cut ring and pinion from an aluminum rear-I hope it holds up for a while. But I figure eventually I'll have to go with the aftermarket set.
WOW, My PSD blows molten alum. from the pistons thru the turbo around 1300 deg. Even the Cummins 5.9's don't run much over 1500 for short bursts.
Little pistons can handle more heat, shorter distance to the rings.
Little pistons can handle more heat, shorter distance to the rings.
I figured you must be doing water. The last 10,000lb ProStock I saw blow fire like that was Carrousel's No Fear Deere. Ran like a striped ass bear! Then burned holes in a couple pistons. Those little oil burners are WAY COOL! Love the pics.
jdiederichs
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- Jim Diederichs
Wow, thanks for the excellent pictures of those Cub Cadets. That really hurts, me sitting home in WI, wanting to run but unable to go thanks to NO job yet since the layoffs. My turbo diesel Yanmar powered 1782 is chomping at the bit after seeing those! In time, I know.........
