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540 vs. 1000 PTO

Many implements require more than 540RPM to operate with adequate power, something a 540 PTO cannot provide.
 
The lower the RPM, the higher the torque required to run the implement. Once you get past about 50 or 60 HP implements, they went to 1000 PTO because the farmers kept twisting the 540 PTO shafts off. And whining about it.
 
Comes down to a hp issue. Over 80 hp or so, a typical 540 pto stub/ shaft can break - more power than it can handle.

So if you spin the shaft 2x as fast, then you can now get up to about 175 hp before it becomes too weak.

Some implements need to spin fast; if 1000pto is available, then it takes less gearing to get it to spin that fast, so those implements like to use 1000rpm (cheaper to build) if it is available.

Not so much tho that one is better than the other.

--->Paul
 
They could probably build things to run at 540, but can build lighter and cheaper if run faster.
 
(quoted from post at 21:25:18 09/08/10) They could probably build things to run at 540, but can build lighter and cheaper if run faster.
Click to expand...

Just how heavy and expensive do you want the drive on a forage harvester with a 150HP tractor driving it?
New 1000rpm pto's on large tractors/equipment are now 1-3/4" dia to handle the power. Manufactures are wishing pto speeds are 1000 and 2000rpm instead of 540 and 1000rpm.
Few things old farmers hate more is 1000rpm equipment. Yet they have no problems jumping into their 365HP diesel pickup with 100,000 miles/3000+ hrs. Then driving down the road at 55mph with a drive shaft/ptoshaft between the transmission and rear axle. Without grease fittings and spinning at 2600rpm.
 
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