Read the one post about the 540 and the 1000 PTO. Why did some tractors have two output PTO's? I had a guy ask that a while back and I did not have a really good answer for him. I knew the 1000 was or bigger equipment and the 540 for small items. Never really knew why there were two shafts in the PTO housing of a tractor.
- Thread starter 300guy
- Start date
Matt from Oz
Member
Hi 300
The main reason for two different PTO speeds is to handle different power requirements of implements and what power a tractor can provide. I am no engineer but the higher 1000 rpm reduces the torque load on the drive train which reduces the chance of snapping a shaft with a higher power load. The two shafts and couplers have different numbers of splines so you can't mistakably put the wrong rpm through specific implements e.g hay bailers. Big squares designed to run on 1000 rpm older small square balers designed for 540 so 1000 rpm would be disastrous. Also speed of blades on bush hogs (what we in Australia call slashers) if run to fast bolts snap and blades go flying. Hope this helps. Matt
The main reason for two different PTO speeds is to handle different power requirements of implements and what power a tractor can provide. I am no engineer but the higher 1000 rpm reduces the torque load on the drive train which reduces the chance of snapping a shaft with a higher power load. The two shafts and couplers have different numbers of splines so you can't mistakably put the wrong rpm through specific implements e.g hay bailers. Big squares designed to run on 1000 rpm older small square balers designed for 540 so 1000 rpm would be disastrous. Also speed of blades on bush hogs (what we in Australia call slashers) if run to fast bolts snap and blades go flying. Hope this helps. Matt
used red MN
Well-known Member
- Location
- Coon Rapids, MN
At first the largest percentage of PTO driven equipment was 540. So later about the early to mid sixties larger tractors with 100 or more horsepower were becoming more available. So as Matt said for pto drive lines to remain reliable the 1000 rpm option became necessary. So now a farmer would have different pieces of equipment requiring both PTO speeds. The most common tractors I know of that had the twin shafts were IH. John Deere had dual speed PTOs starting with the new generation tractors such as 30-4010. But on those you just swapped out the stub shaft that was held in by a snap ring. The drive end was splined different to engage into the proper gearing already in inside the tractor. Some Cases used this method as well, there were other brands to I?m sure. Now with 2-300 horse tractors being common a larger diameter 1000 rpm PTO is now also offered. A quick google search says smaller 1000 is 1 3/8, large is 1 3/4?.
gene bender
Well-known Member
some implements need 540 and some need 1000 there are many implements that use pto for their operation and it just makes sense to have the different RPM speed. You dont want a post hole digger to run fast and you dont want a generator to run slow.
BarnyardEngineering
Well-known Member
- Location
- Rochester, NY
There are two shafts because that is how the manufacturer decided to handle having both 540 and 1000 RPM PTOs available for convenience.
Some manufacturers have a single shaft with an interchangeable output shaft and a way to shift from 540 to 1000 and back. These are less convenient because you have to fool with snap rings or bolts, lost shafts, getting the shaft back in if it hasn't been switched in a while, etc..
Some manufacturers have a single shaft with an interchangeable output shaft and a way to shift from 540 to 1000 and back. These are less convenient because you have to fool with snap rings or bolts, lost shafts, getting the shaft back in if it hasn't been switched in a while, etc..
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