I worked on a farm for a couple of summers that had a 730 diesel. I really fell in love with that tractor. I think that John Deere missed a good bet by not keeping it.
This farm used to swap work with dad. Kind of adopted him when their father died. One summer we put the 4 row cultivator on our B John Deere to cultivate corn and sugar beets. The B used to go through about 15 gallons of gas in a good day. The next year put the cultivator on the 730. It would use about 5 to 7 gallons of fuel to do the same work.
The other observation says something about an engine that is running at its torque peak rather than at its hp peak. We were filling silo and decided to use a gas powered 2020 John Deere to run the silo filler. The 730 was used to shuttle the wagons to and from the corn field. Both tractors were about the same hp, ie 55 - 58.
I noticed that when the 2020 would get a slug of corn that it would start lugging down, and there wouldn't be enough air to keep the corn blowing up the pipe. So the corn would fall to the bottom of the pipe and plug the blower.
I switched and put the 730 on the filler. When It would get a slug of corn it would just work a little harder without slowing down and the pipe wouldn't plug.
Since the 730 was running at the torque peak it didn't have to slow down to get to the peak. Therefore it could pull through better.
The philosophy on the new tractors is to get the hp through RPM. Forgetting that it is the torque that is the force to pull the load.
A lot like my old Gravelys. Yup "only" 6.6hp. OMG torque that will pull a house down though. Old tech, was not always bad. High HP motors have there place, but nothing like the grunt from a oldtech,long arm, heavy flywheel, chunk of iron.
2 old Gravely L's
Interesting thing. Heard it in relation to plowing, but holds true for all work. On the average it used to take 1.5 gallons of gas to plow an acre of land. It didn't matter if you were using a single bottom, or multiple bottoms, enough power to move at 1 mph or 5 mph!
Goes right back to the physics I learned as an engineer, " no matter the path you take from the start point to the finish point it takes the same amount of work to get there".
Yes silo filling is like snow blowing, both cases are running a blower.
On Classic Tractor on RFD TV tonight, they showed a running John Deere 830 which was the largest and most powerful of the 2 cylinder Deeres built at 472 cubic inches and 81 pto hp. Talk about a mega thumper! This one had the electric start instead of the pony motor start.
I've probably told this story somewhere here before, but its worth telling again here. Every summer I used to go to the Flemington NJ Ag Fair on Farmer's Day to watch the local farmers (including my neighbor) at the tractor pulls. One year in the late 1980s. in the lightest weight class (I believe it was 3000 pounds and under< but I could be off a little) a lot of the tractors were small Fords, Kubotas, Massey Fergusons and other small utility tractors used on the large estates that were spring up at the time. You had to see the majority of these machines, they were all shiny, never used on a farm for plowing, and among these was one little John Deere 2 cylinder from the 1930s (unstyled) with a local farmer's wife driving. She hooked up and that engine just popped along........ the weight slid up the trailer and that engine never changed rythm, just popped louder........ weight creeped........ popped louder. She won by pulling over 50 feet further than any of the new pretty diesels. That monsterous amount of torque and big flywheel sure made a difference.
Last edited by bontai Joe; 01-11-2005 at 08:56 PM.