Combines knife rolls on 1293

[hayman]

knife rolls will be harder on the reverser. we run a 1293 on a 9600 and 9610 and never had problems check your roll speed-- are you running in direct, over or under driver.

 

[PrairieDog]

Hayman - we run the drive sprockets on the head under the driven (factory setting). Do you run your drivers over the drivenIJ We have the variable speed feeder drive and usually run the shaft speed around 660 rpm, when we try to run the shaft faster than that we get excessive belt slippage and that causes the reverser to get hot enough you can smell the oil in the cab. But maybe we need to run the shaft around 700 rpm anyway to keep the row unit shafts from breaking. (Have had 2 break on the left side and one on the right side within the first six years of having the head, just got done with the ninth year with it. The dealer never keeps those 14 foot shafts on hand so we have to take a whole day to travel and get one.) We shell a lot of wet corn in the 22-24% range and usually never travel over 3mph with that wet of corn. Would like to know what you run your header speed atIJ Maybe that will help me with why we have trouble with shafts breaking and the reverser overheating.

 

[dakota]

We have four twelve row heads and break shafts every season. I don't know of anybody who has not broken shafts. Before corn harvest starts I call the dealer and make sure he keeps them in stock. One reverser burned up last season. Well it was used, so I don't know all of its history. But for next harvest I will change the oil, as soon as it gets burned. Synthetic oil lasts longer, too. We only have one machine left with the small reverser. We run all our heads 1:1 on the chain drive. That means the two little sprokets are on one side and the two big ones on the other side. That seems to work best to match the gathering chains with the ground speed of 3-4mph. A friend of ours had all new 2004 corn heads with the bigger shafts in and they still broke, because JD used the same sprokets and therefore had to narrow the shaft at the end.

 

[Steamer]

I run a 1293 on a 9750STS-sprockets 1-1 and am breaking shafts also. Mine has the small shafts on it and was wondering if it would pay to go to the big shafts. I have the tapered rolls on mine witch is suppose to take the least power. Also I run nothing but syn. oil in my reverser, the big one and dont seem to have any problems.

 

[hayman]

we run in direct drive. we like the speed range that gives us. in think that deere sets them in that from the factory. we will run our speed from 550 to 650 depending on the crop conditions.

 

[dakota]

like I wrote, a friend of ours had the big shafts last fall and they still broke. The big shafts are small at the end to fit the old sprokets on. That's apparently where they break.

 

[PrairieDog]

Dakota -- Do you run knife rolls on your twelve row headsIJ Do you like the knife rollsIJ Do they stay sharp for awhileIJ The row unit shafts Deere uses, seem to be made of soft steel because they break easily from time to time. I wonder if a guy could take one to a local metal fabricator and have one copied made of much harder steel.

 

[dakota]

We don't run any knife rolls, too expensive. The fluted stalkrolls we can rebuild. On the drive shafts I actually think it's the other way around. They are hardened, otherwise the hex would get wallered out in the row units. They often break where the collar is welded on, on the outside. The weld probably interfears with the hardening. You have to keep one thing in mind. The engineer who designed the cornhead figured it would use around 7hp per row unit. After about 20 years, in fall of 2002, the JD engineers finally came out and actually measured the power used. It was more like 13hp per row unit. This is why shafts and reversers are breaking. In 2003 you could buy an extra high capacity reverser on the 50 series. The gears in it are physically wider than on the high capacity version.