Changing pto speed

I would like to know if it is possible to change the pto speed on a 210 Allis Chalmers from 1000 to 540, if possible how much would it cost?

The AC 210 was the replacement for the D21 tractor. They never where 540 PTO. There is no AC part to change the PTO speed. None of the AC models that had 540 PTO will work. They had completely different housings.

So you would have to have different gears made for inside the transmission. Even then I am not sure you could get it done in one reduction. Most of the time 540 PTOs have a two stage reduction to get a large enough ratio to step down.

There where a few after market gear cases that would bolt on the out side that reduced the PTO speed. They where costly and most got tore up because they where not made for high horsepower applications. They where a $1000 back in the early 1970s. I think even M&W made a few. Most farmers don't understand that horsepower is torque x RPM. So when you cut the RPM in half you double the torque. They would think "Well it hooks upppppp. It should pull everything fine". Then when the gear case broke the farmers moaned that the company making them where crooks and made junk.

There was a small local company here in North-East Iowa that made a few of them. The owner got so mad at guys tearing them up that he bought all of them back and destroyed them. Told the guys to go pound sand. He had made them rated at 85 horse power. You could spread fertilizer, run manure spreaders, even square balers. Guys where putting them on forage choppers and blowers then wanting him to warranty them when they broke them.

Wasn't Hub City another maker of those for a time?

--->Paul

If your not running something that requires power like choppers and blowers. Just go get an adapter for the PTO it fits one the 1000 and has 540 spline. You will need to throttle the engine accordingly for the speed difference. Or throw the drive shaft out due to the balancing difference for the speed. We tried one this year to run haybine works great run tractor about 1100-1200RPM that will give about the right speed.