I'm trying to figure out what my PTO speed is when the tractor's engine is running at near idle. My main question is whether PTO speed is linear with the engine speed. If my tractor (JD 770) is rated for 540 PTO RPM at 2600 engine RPM, can I assume that with the engine at near idle (800-1000 RPM) the PTO speed will be about 165-200 RPM?
What I'm doing is reworking an old cement mixer that is going to be run off the tractor PTO. My tractor is supposed to be about 20HP at the PTO, and I can't see the sense of running the tractor at full throttle when I should be able to accomplish the task with far less power. Since I have a belt drive between the gearbox and the ring gear, I can easily adjust speeds once I figure out the tractor PTO speed.
I am also wondering what the rotational speed of a cement mixer drum should be, if anyone knows.
Thanks.
What I'm doing is reworking an old cement mixer that is going to be run off the tractor PTO. My tractor is supposed to be about 20HP at the PTO, and I can't see the sense of running the tractor at full throttle when I should be able to accomplish the task with far less power. Since I have a belt drive between the gearbox and the ring gear, I can easily adjust speeds once I figure out the tractor PTO speed.
I am also wondering what the rotational speed of a cement mixer drum should be, if anyone knows.
Thanks.